Gigaset: permit module unload
Fix the initialization and reference counting of the Gigaset driver modules so that they can be unloaded when they are not actually in use. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Cc: Hansjoerg Lipp <hjlipp@web.de> Cc: Greg KH <gregkh@suse.de> Cc: Karsten Keil <kkeil@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tilman Schmidt
Linus Torvalds
parent
9d4bee2b9d
commit
e468c04894
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@ -134,7 +134,6 @@ struct bas_cardstate {
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static struct gigaset_driver *driver = NULL;
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static struct cardstate *cardstate = NULL;
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/* usb specific object needed to register this driver with the usb subsystem */
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static struct usb_driver gigaset_usb_driver = {
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@ -2247,11 +2246,11 @@ static int gigaset_probe(struct usb_interface *interface,
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__func__, le16_to_cpu(udev->descriptor.idVendor),
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le16_to_cpu(udev->descriptor.idProduct));
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cs = gigaset_getunassignedcs(driver);
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if (!cs) {
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dev_err(&udev->dev, "no free cardstate\n");
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/* allocate memory for our device state and intialize it */
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cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
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GIGASET_MODULENAME);
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if (!cs)
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return -ENODEV;
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}
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ucs = cs->hw.bas;
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/* save off device structure ptrs for later use */
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@ -2320,7 +2319,7 @@ allocerr:
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error:
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freeurbs(cs);
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usb_set_intfdata(interface, NULL);
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gigaset_unassign(cs);
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gigaset_freecs(cs);
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return -ENODEV;
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}
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@ -2362,7 +2361,7 @@ static void gigaset_disconnect(struct usb_interface *interface)
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ucs->interface = NULL;
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ucs->udev = NULL;
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cs->dev = NULL;
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gigaset_unassign(cs);
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gigaset_freecs(cs);
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}
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/* gigaset_suspend
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@ -2501,12 +2500,6 @@ static int __init bas_gigaset_init(void)
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&gigops, THIS_MODULE)) == NULL)
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goto error;
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/* allocate memory for our device state and intialize it */
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cardstate = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
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GIGASET_MODULENAME);
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if (!cardstate)
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goto error;
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/* register this driver with the USB subsystem */
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result = usb_register(&gigaset_usb_driver);
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if (result < 0) {
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@ -2518,9 +2511,7 @@ static int __init bas_gigaset_init(void)
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info(DRIVER_DESC);
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return 0;
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error: if (cardstate)
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gigaset_freecs(cardstate);
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cardstate = NULL;
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error:
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if (driver)
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gigaset_freedriver(driver);
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driver = NULL;
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@ -2532,43 +2523,50 @@ error: if (cardstate)
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*/
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static void __exit bas_gigaset_exit(void)
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{
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struct bas_cardstate *ucs = cardstate->hw.bas;
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struct bas_cardstate *ucs;
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int i;
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gigaset_blockdriver(driver); /* => probe will fail
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* => no gigaset_start any more
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*/
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gigaset_shutdown(cardstate);
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/* from now on, no isdn callback should be possible */
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/* stop all connected devices */
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for (i = 0; i < driver->minors; i++) {
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if (gigaset_shutdown(driver->cs + i) < 0)
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continue; /* no device */
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/* from now on, no isdn callback should be possible */
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/* close all still open channels */
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if (ucs->basstate & BS_B1OPEN) {
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gig_dbg(DEBUG_INIT, "closing B1 channel");
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usb_control_msg(ucs->udev, usb_sndctrlpipe(ucs->udev, 0),
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HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ, 0, 0,
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NULL, 0, BAS_TIMEOUT);
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/* close all still open channels */
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ucs = driver->cs[i].hw.bas;
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if (ucs->basstate & BS_B1OPEN) {
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gig_dbg(DEBUG_INIT, "closing B1 channel");
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usb_control_msg(ucs->udev,
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usb_sndctrlpipe(ucs->udev, 0),
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HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
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0, 0, NULL, 0, BAS_TIMEOUT);
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}
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if (ucs->basstate & BS_B2OPEN) {
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gig_dbg(DEBUG_INIT, "closing B2 channel");
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usb_control_msg(ucs->udev,
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usb_sndctrlpipe(ucs->udev, 0),
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HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
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0, 0, NULL, 0, BAS_TIMEOUT);
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}
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if (ucs->basstate & BS_ATOPEN) {
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gig_dbg(DEBUG_INIT, "closing AT channel");
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usb_control_msg(ucs->udev,
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usb_sndctrlpipe(ucs->udev, 0),
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HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
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0, 0, NULL, 0, BAS_TIMEOUT);
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}
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ucs->basstate = 0;
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}
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if (ucs->basstate & BS_B2OPEN) {
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gig_dbg(DEBUG_INIT, "closing B2 channel");
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usb_control_msg(ucs->udev, usb_sndctrlpipe(ucs->udev, 0),
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HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ, 0, 0,
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NULL, 0, BAS_TIMEOUT);
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}
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if (ucs->basstate & BS_ATOPEN) {
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gig_dbg(DEBUG_INIT, "closing AT channel");
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usb_control_msg(ucs->udev, usb_sndctrlpipe(ucs->udev, 0),
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HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ, 0, 0,
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NULL, 0, BAS_TIMEOUT);
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}
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ucs->basstate = 0;
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/* deregister this driver with the USB subsystem */
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usb_deregister(&gigaset_usb_driver);
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/* this will call the disconnect-callback */
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/* from now on, no disconnect/probe callback should be running */
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gigaset_freecs(cardstate);
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cardstate = NULL;
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gigaset_freedriver(driver);
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driver = NULL;
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}
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@ -31,7 +31,6 @@ MODULE_PARM_DESC(debug, "debug level");
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/* driver state flags */
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#define VALID_MINOR 0x01
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#define VALID_ID 0x02
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#define ASSIGNED 0x04
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void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
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size_t len, const unsigned char *buf)
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@ -178,7 +177,7 @@ int gigaset_get_channel(struct bc_state *bcs)
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unsigned long flags;
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spin_lock_irqsave(&bcs->cs->lock, flags);
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if (bcs->use_count) {
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if (bcs->use_count || !try_module_get(bcs->cs->driver->owner)) {
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gig_dbg(DEBUG_ANY, "could not allocate channel %d",
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bcs->channel);
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spin_unlock_irqrestore(&bcs->cs->lock, flags);
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@ -203,6 +202,7 @@ void gigaset_free_channel(struct bc_state *bcs)
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}
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--bcs->use_count;
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bcs->busy = 0;
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module_put(bcs->cs->driver->owner);
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gig_dbg(DEBUG_ANY, "freed channel %d", bcs->channel);
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spin_unlock_irqrestore(&bcs->cs->lock, flags);
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}
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@ -356,31 +356,28 @@ static struct cardstate *alloc_cs(struct gigaset_driver *drv)
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{
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unsigned long flags;
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unsigned i;
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struct cardstate *cs;
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struct cardstate *ret = NULL;
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spin_lock_irqsave(&drv->lock, flags);
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if (drv->blocked)
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goto exit;
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for (i = 0; i < drv->minors; ++i) {
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if (!(drv->flags[i] & VALID_MINOR)) {
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if (try_module_get(drv->owner)) {
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drv->flags[i] = VALID_MINOR;
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ret = drv->cs + i;
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}
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cs = drv->cs + i;
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if (!(cs->flags & VALID_MINOR)) {
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cs->flags = VALID_MINOR;
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ret = cs;
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break;
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}
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}
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exit:
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spin_unlock_irqrestore(&drv->lock, flags);
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return ret;
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}
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static void free_cs(struct cardstate *cs)
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{
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unsigned long flags;
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struct gigaset_driver *drv = cs->driver;
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spin_lock_irqsave(&drv->lock, flags);
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if (drv->flags[cs->minor_index] & VALID_MINOR)
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module_put(drv->owner);
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drv->flags[cs->minor_index] = 0;
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spin_unlock_irqrestore(&drv->lock, flags);
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cs->flags = 0;
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}
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static void make_valid(struct cardstate *cs, unsigned mask)
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@ -388,7 +385,7 @@ static void make_valid(struct cardstate *cs, unsigned mask)
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unsigned long flags;
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struct gigaset_driver *drv = cs->driver;
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spin_lock_irqsave(&drv->lock, flags);
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drv->flags[cs->minor_index] |= mask;
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cs->flags |= mask;
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spin_unlock_irqrestore(&drv->lock, flags);
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}
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@ -397,7 +394,7 @@ static void make_invalid(struct cardstate *cs, unsigned mask)
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unsigned long flags;
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struct gigaset_driver *drv = cs->driver;
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spin_lock_irqsave(&drv->lock, flags);
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drv->flags[cs->minor_index] &= ~mask;
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cs->flags &= ~mask;
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spin_unlock_irqrestore(&drv->lock, flags);
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}
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@ -893,10 +890,17 @@ error:
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}
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EXPORT_SYMBOL_GPL(gigaset_start);
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void gigaset_shutdown(struct cardstate *cs)
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/* gigaset_shutdown
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* check if a device is associated to the cardstate structure and stop it
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* return value: 0 if ok, -1 if no device was associated
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*/
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int gigaset_shutdown(struct cardstate *cs)
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{
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mutex_lock(&cs->mutex);
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if (!(cs->flags & VALID_MINOR))
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return -1;
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cs->waiting = 1;
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if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
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@ -913,6 +917,7 @@ void gigaset_shutdown(struct cardstate *cs)
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exit:
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mutex_unlock(&cs->mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gigaset_shutdown);
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@ -954,13 +959,11 @@ struct cardstate *gigaset_get_cs_by_id(int id)
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list_for_each_entry(drv, &drivers, list) {
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spin_lock(&drv->lock);
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for (i = 0; i < drv->minors; ++i) {
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if (drv->flags[i] & VALID_ID) {
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cs = drv->cs + i;
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if (cs->myid == id)
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ret = cs;
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}
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if (ret)
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cs = drv->cs + i;
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if ((cs->flags & VALID_ID) && cs->myid == id) {
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ret = cs;
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break;
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}
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}
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spin_unlock(&drv->lock);
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if (ret)
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@ -983,10 +986,9 @@ void gigaset_debugdrivers(void)
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spin_lock(&drv->lock);
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for (i = 0; i < drv->minors; ++i) {
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gig_dbg(DEBUG_DRIVER, " index %u", i);
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gig_dbg(DEBUG_DRIVER, " flags 0x%02x",
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drv->flags[i]);
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cs = drv->cs + i;
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gig_dbg(DEBUG_DRIVER, " cardstate %p", cs);
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gig_dbg(DEBUG_DRIVER, " flags 0x%02x", cs->flags);
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gig_dbg(DEBUG_DRIVER, " minor_index %u",
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cs->minor_index);
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gig_dbg(DEBUG_DRIVER, " driver %p", cs->driver);
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@ -1010,7 +1012,7 @@ static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
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continue;
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index = minor - drv->minor;
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spin_lock(&drv->lock);
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if (drv->flags[index] & VALID_MINOR)
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if (drv->cs[index].flags & VALID_MINOR)
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ret = drv->cs + index;
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spin_unlock(&drv->lock);
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if (ret)
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@ -1038,7 +1040,6 @@ void gigaset_freedriver(struct gigaset_driver *drv)
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gigaset_if_freedriver(drv);
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kfree(drv->cs);
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kfree(drv->flags);
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kfree(drv);
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}
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EXPORT_SYMBOL_GPL(gigaset_freedriver);
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@ -1080,12 +1081,8 @@ struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
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if (!drv->cs)
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goto error;
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drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL);
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if (!drv->flags)
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goto error;
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for (i = 0; i < minors; ++i) {
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drv->flags[i] = 0;
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drv->cs[i].flags = 0;
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drv->cs[i].driver = drv;
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drv->cs[i].ops = drv->ops;
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drv->cs[i].minor_index = i;
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@ -1106,53 +1103,9 @@ error:
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}
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EXPORT_SYMBOL_GPL(gigaset_initdriver);
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/* For drivers without fixed assignment device<->cardstate (usb) */
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struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv)
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{
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unsigned long flags;
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struct cardstate *cs = NULL;
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unsigned i;
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spin_lock_irqsave(&drv->lock, flags);
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if (drv->blocked)
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goto exit;
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for (i = 0; i < drv->minors; ++i) {
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if ((drv->flags[i] & VALID_MINOR) &&
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!(drv->flags[i] & ASSIGNED)) {
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drv->flags[i] |= ASSIGNED;
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cs = drv->cs + i;
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break;
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}
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}
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exit:
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spin_unlock_irqrestore(&drv->lock, flags);
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return cs;
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}
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EXPORT_SYMBOL_GPL(gigaset_getunassignedcs);
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void gigaset_unassign(struct cardstate *cs)
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{
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unsigned long flags;
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unsigned *minor_flags;
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struct gigaset_driver *drv;
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if (!cs)
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return;
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drv = cs->driver;
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spin_lock_irqsave(&drv->lock, flags);
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minor_flags = drv->flags + cs->minor_index;
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if (*minor_flags & VALID_MINOR)
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*minor_flags &= ~ASSIGNED;
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spin_unlock_irqrestore(&drv->lock, flags);
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}
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EXPORT_SYMBOL_GPL(gigaset_unassign);
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void gigaset_blockdriver(struct gigaset_driver *drv)
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{
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unsigned long flags;
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spin_lock_irqsave(&drv->lock, flags);
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drv->blocked = 1;
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spin_unlock_irqrestore(&drv->lock, flags);
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}
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EXPORT_SYMBOL_GPL(gigaset_blockdriver);
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@ -435,6 +435,7 @@ struct cardstate {
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unsigned minor_index;
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struct device *dev;
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struct device *tty_dev;
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unsigned flags;
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const struct gigaset_ops *ops;
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@ -539,7 +540,6 @@ struct gigaset_driver {
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unsigned minor;
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unsigned minors;
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struct cardstate *cs;
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unsigned *flags;
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int blocked;
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const struct gigaset_ops *ops;
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@ -767,10 +767,6 @@ void gigaset_freedriver(struct gigaset_driver *drv);
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void gigaset_debugdrivers(void);
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struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty);
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struct cardstate *gigaset_get_cs_by_id(int id);
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/* For drivers without fixed assignment device<->cardstate (usb) */
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struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv);
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void gigaset_unassign(struct cardstate *cs);
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void gigaset_blockdriver(struct gigaset_driver *drv);
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/* Allocate and initialize card state. Calls hardware dependent
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@ -789,7 +785,7 @@ int gigaset_start(struct cardstate *cs);
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void gigaset_stop(struct cardstate *cs);
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/* Tell common.c that the driver is being unloaded. */
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void gigaset_shutdown(struct cardstate *cs);
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int gigaset_shutdown(struct cardstate *cs);
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/* Tell common.c that an skb has been sent. */
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void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
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@ -161,7 +161,7 @@ static int if_open(struct tty_struct *tty, struct file *filp)
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tty->driver_data = NULL;
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cs = gigaset_get_cs_by_tty(tty);
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if (!cs)
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if (!cs || !try_module_get(cs->driver->owner))
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return -ENODEV;
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if (mutex_lock_interruptible(&cs->mutex))
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@ -207,6 +207,8 @@ static void if_close(struct tty_struct *tty, struct file *filp)
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}
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mutex_unlock(&cs->mutex);
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module_put(cs->driver->owner);
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}
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static int if_ioctl(struct tty_struct *tty, struct file *file,
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@ -115,7 +115,6 @@ static int gigaset_resume(struct usb_interface *intf);
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static int gigaset_pre_reset(struct usb_interface *intf);
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static struct gigaset_driver *driver = NULL;
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static struct cardstate *cardstate = NULL;
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/* usb specific object needed to register this driver with the usb subsystem */
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||||
static struct usb_driver gigaset_usb_driver = {
|
||||
|
|
@ -727,11 +726,10 @@ static int gigaset_probe(struct usb_interface *interface,
|
|||
|
||||
dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);
|
||||
|
||||
cs = gigaset_getunassignedcs(driver);
|
||||
if (!cs) {
|
||||
dev_warn(&udev->dev, "no free cardstate\n");
|
||||
/* allocate memory for our device state and intialize it */
|
||||
cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
|
||||
if (!cs)
|
||||
return -ENODEV;
|
||||
}
|
||||
ucs = cs->hw.usb;
|
||||
|
||||
/* save off device structure ptrs for later use */
|
||||
|
|
@ -818,7 +816,7 @@ error:
|
|||
usb_put_dev(ucs->udev);
|
||||
ucs->udev = NULL;
|
||||
ucs->interface = NULL;
|
||||
gigaset_unassign(cs);
|
||||
gigaset_freecs(cs);
|
||||
return retval;
|
||||
}
|
||||
|
||||
|
|
@ -852,7 +850,7 @@ static void gigaset_disconnect(struct usb_interface *interface)
|
|||
ucs->interface = NULL;
|
||||
ucs->udev = NULL;
|
||||
cs->dev = NULL;
|
||||
gigaset_unassign(cs);
|
||||
gigaset_freecs(cs);
|
||||
}
|
||||
|
||||
/* gigaset_suspend
|
||||
|
|
@ -934,11 +932,6 @@ static int __init usb_gigaset_init(void)
|
|||
&ops, THIS_MODULE)) == NULL)
|
||||
goto error;
|
||||
|
||||
/* allocate memory for our device state and intialize it */
|
||||
cardstate = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
|
||||
if (!cardstate)
|
||||
goto error;
|
||||
|
||||
/* register this driver with the USB subsystem */
|
||||
result = usb_register(&gigaset_usb_driver);
|
||||
if (result < 0) {
|
||||
|
|
@ -951,9 +944,7 @@ static int __init usb_gigaset_init(void)
|
|||
info(DRIVER_DESC);
|
||||
return 0;
|
||||
|
||||
error: if (cardstate)
|
||||
gigaset_freecs(cardstate);
|
||||
cardstate = NULL;
|
||||
error:
|
||||
if (driver)
|
||||
gigaset_freedriver(driver);
|
||||
driver = NULL;
|
||||
|
|
@ -967,11 +958,16 @@ error: if (cardstate)
|
|||
*/
|
||||
static void __exit usb_gigaset_exit(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
gigaset_blockdriver(driver); /* => probe will fail
|
||||
* => no gigaset_start any more
|
||||
*/
|
||||
|
||||
gigaset_shutdown(cardstate);
|
||||
/* stop all connected devices */
|
||||
for (i = 0; i < driver->minors; i++)
|
||||
gigaset_shutdown(driver->cs + i);
|
||||
|
||||
/* from now on, no isdn callback should be possible */
|
||||
|
||||
/* deregister this driver with the USB subsystem */
|
||||
|
|
@ -979,8 +975,6 @@ static void __exit usb_gigaset_exit(void)
|
|||
/* this will call the disconnect-callback */
|
||||
/* from now on, no disconnect/probe callback should be running */
|
||||
|
||||
gigaset_freecs(cardstate);
|
||||
cardstate = NULL;
|
||||
gigaset_freedriver(driver);
|
||||
driver = NULL;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue