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V4L/DVB (9266): videobuf: properly handle attachment failure

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This fixes attachment failure where we now unwind
attachment and skip non-attached nodes where
necessary so we can survive a fault situation
correctly.

Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Darron Broad 2008-10-15 13:48:43 -03:00 committed by Mauro Carvalho Chehab
parent 7bdf84fc47
commit e43f3fab05
1 changed files with 24 additions and 13 deletions
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37
drivers/media/video/videobuf-dvb.c
View file

@ -145,19 +145,19 @@ int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
{
struct list_head *list, *q;
struct videobuf_dvb_frontend *fe;
int res = -EINVAL;
int res;
fe = videobuf_dvb_get_frontend(f, 1);
if (!fe) {
printk(KERN_WARNING "Unable to register the adapter which has no frontends\n");
goto err;
return -EINVAL;
}
/* Bring up the adapter */
res = videobuf_dvb_register_adapter(f, module, adapter_priv, device, fe->dvb.name, adapter_nr, mfe_shared);
if (res < 0) {
printk(KERN_WARNING "videobuf_dvb_register_adapter failed (errno = %d)\n", res);
goto err;
return res;
}
/* Attach all of the frontends to the adapter */
@ -168,11 +168,15 @@ int videobuf_dvb_register_bus(struct videobuf_dvb_frontends *f,
if (res < 0) {
printk(KERN_WARNING "%s: videobuf_dvb_register_frontend failed (errno = %d)\n",
fe->dvb.name, res);
goto err;
}
}
mutex_unlock(&f->lock);
return 0;
err:
mutex_unlock(&f->lock);
videobuf_dvb_unregister_bus(f);
return res;
}
@ -264,6 +268,10 @@ int videobuf_dvb_register_frontend(struct dvb_adapter *adapter, struct videobuf_
/* register network adapter */
dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
if (dvb->net.dvbdev == NULL) {
result = -ENOMEM;
goto fail_fe_conn;
}
return 0;
fail_fe_conn:
@ -278,7 +286,7 @@ fail_dmx:
dvb_unregister_frontend(dvb->frontend);
fail_frontend:
dvb_frontend_detach(dvb->frontend);
dvb_unregister_adapter(adapter);
dvb->frontend = NULL;
return result;
}
@ -291,15 +299,18 @@ void videobuf_dvb_unregister_bus(struct videobuf_dvb_frontends *f)
mutex_lock(&f->lock);
list_for_each_safe(list, q, &f->felist) {
fe = list_entry(list, struct videobuf_dvb_frontend, felist);
dvb_net_release(&fe->dvb.net);
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_mem);
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_hw);
dvb_dmxdev_release(&fe->dvb.dmxdev);
dvb_dmx_release(&fe->dvb.demux);
dvb_unregister_frontend(fe->dvb.frontend);
dvb_frontend_detach(fe->dvb.frontend);
if(fe->dvb.net.dvbdev) {
dvb_net_release(&fe->dvb.net);
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_mem);
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx, &fe->dvb.fe_hw);
dvb_dmxdev_release(&fe->dvb.dmxdev);
dvb_dmx_release(&fe->dvb.demux);
dvb_unregister_frontend(fe->dvb.frontend);
}
if(fe->dvb.frontend) { /* always allocated, may have been reset */
dvb_frontend_detach(fe->dvb.frontend);
fe->dvb.frontend = NULL;
}
list_del(list);
kfree(fe);
}