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From: Jiri Slaby on 18 Jul 2010 14:40
In dvb_dvr_release, there is a test dvbdev->users==-1, but users are
never negative. This error results in hung tasks:
task PC stack pid father
bash D ffffffffa000c948 0 3264 3170 0x00000000
ffff88003aec5ce8 0000000000000086 0000000000011f80 0000000000011f80
ffff88003aec5fd8 ffff88003aec5fd8 ffff88003b848670 0000000000011f80
ffff88003aec5fd8 0000000000011f80 ffff88003e02a030 ffff88003b848670
Call Trace:
[<ffffffff813dd4a5>] dvb_dmxdev_release+0xc5/0x130
[<ffffffff8107b750>] ? autoremove_wake_function+0x0/0x40
[<ffffffffa00013a2>] dvb_usb_adapter_dvb_exit+0x42/0x70 [dvb_usb]
[<ffffffffa0000525>] dvb_usb_exit+0x55/0xd0 [dvb_usb]
[<ffffffffa00005ee>] dvb_usb_device_exit+0x4e/0x70 [dvb_usb]
[<ffffffffa000a065>] af9015_usb_device_exit+0x55/0x60 [dvb_usb_af9015]
[<ffffffff813a3f05>] usb_unbind_interface+0x55/0x1a0
[<ffffffff81316000>] __device_release_driver+0x70/0xe0
....

So check against 1 there instead.

BTW why's the TODO there? Adding TODOs to the code without
descriptions is like adding nothing.

Signed-off-by: Jiri Slaby <jslaby(a)suse.cz>
Cc: Markus Rechberger <markus.rechberger(a)amd.com>
Cc: Mauro Carvalho Chehab <mchehab(a)infradead.org>
---
drivers/media/dvb/dvb-core/dmxdev.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/media/dvb/dvb-core/dmxdev.c b/drivers/media/dvb/dvb-core/dmxdev.c
index 425862f..0042306 100644
--- a/drivers/media/dvb/dvb-core/dmxdev.c
+++ b/drivers/media/dvb/dvb-core/dmxdev.c
@@ -207,7 +207,7 @@ static int dvb_dvr_release(struct inode *inode, struct file *file)
}
/* TODO */
dvbdev->users--;
- if(dvbdev->users==-1 && dmxdev->exit==1) {
+ if (dvbdev->users == 1 && dmxdev->exit == 1) {
fops_put(file->f_op);
file->f_op = NULL;
mutex_unlock(&dmxdev->mutex);
--
1.7.1


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