USB: EHCI: log a warning if ehci-hcd is not loaded first
This patch (as1139) adds a warning to the system log whenever ehci-hcd is loaded after ohci-hcd or uhci-hcd. Nowadays most distributions are pretty good about not doing this; maybe the warning will help convince anyone still doing it wrong. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@kernel.org> [2.6.27] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -81,6 +81,10 @@
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/*-------------------------------------------------------------------------*/
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/* Keep track of which host controller drivers are loaded */
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unsigned long usb_hcds_loaded;
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EXPORT_SYMBOL_GPL(usb_hcds_loaded);
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/* host controllers we manage */
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LIST_HEAD (usb_bus_list);
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EXPORT_SYMBOL_GPL (usb_bus_list);
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@ -482,4 +482,10 @@ static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
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*/
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extern struct rw_semaphore ehci_cf_port_reset_rwsem;
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/* Keep track of which host controller drivers are loaded */
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#define USB_UHCI_LOADED 0
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#define USB_OHCI_LOADED 1
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#define USB_EHCI_LOADED 2
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extern unsigned long usb_hcds_loaded;
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#endif /* __KERNEL__ */
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@ -1046,6 +1046,12 @@ static int __init ehci_hcd_init(void)
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return -ENODEV;
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printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
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set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
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if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
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test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
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printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
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" before uhci_hcd and ohci_hcd, not after\n");
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pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
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hcd_name,
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sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
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@ -1053,8 +1059,10 @@ static int __init ehci_hcd_init(void)
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#ifdef DEBUG
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ehci_debug_root = debugfs_create_dir("ehci", NULL);
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if (!ehci_debug_root)
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return -ENOENT;
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if (!ehci_debug_root) {
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retval = -ENOENT;
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goto err_debug;
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}
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#endif
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#ifdef PLATFORM_DRIVER
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@ -1102,6 +1110,8 @@ clean0:
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debugfs_remove(ehci_debug_root);
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ehci_debug_root = NULL;
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#endif
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err_debug:
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clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
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return retval;
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}
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module_init(ehci_hcd_init);
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@ -1123,6 +1133,7 @@ static void __exit ehci_hcd_cleanup(void)
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#ifdef DEBUG
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debugfs_remove(ehci_debug_root);
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#endif
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clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
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}
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module_exit(ehci_hcd_cleanup);
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@ -1095,6 +1095,7 @@ static int __init ohci_hcd_mod_init(void)
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printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
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pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
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sizeof (struct ed), sizeof (struct td));
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set_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
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#ifdef DEBUG
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ohci_debug_root = debugfs_create_dir("ohci", NULL);
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@ -1181,6 +1182,7 @@ static int __init ohci_hcd_mod_init(void)
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error_debug:
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#endif
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clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
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return retval;
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}
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module_init(ohci_hcd_mod_init);
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@ -1211,6 +1213,7 @@ static void __exit ohci_hcd_mod_exit(void)
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#ifdef DEBUG
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debugfs_remove(ohci_debug_root);
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#endif
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clear_bit(USB_OHCI_LOADED, &usb_hcds_loaded);
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}
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module_exit(ohci_hcd_mod_exit);
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@ -955,6 +955,7 @@ static int __init uhci_hcd_init(void)
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printk(KERN_INFO "uhci_hcd: " DRIVER_DESC "%s\n",
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ignore_oc ? ", overcurrent ignored" : "");
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set_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
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if (DEBUG_CONFIGURED) {
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errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
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@ -987,6 +988,7 @@ debug_failed:
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errbuf_failed:
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clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
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return retval;
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}
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@ -996,6 +998,7 @@ static void __exit uhci_hcd_cleanup(void)
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kmem_cache_destroy(uhci_up_cachep);
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debugfs_remove(uhci_debugfs_root);
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kfree(errbuf);
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clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
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}
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module_init(uhci_hcd_init);
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