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| author | Jiri Slaby <jslaby@suse.cz> | 2010-07-18 20:34:18 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-08-02 21:43:16 +0200 |
| commit | 1c488ea9d52032d07dd320d31e0720239c93dd64 (patch) | |
| tree | 7de7d816c2bf4dfbf92322c13dd39e398ff45f27 /drivers/media/dvb | |
| parent | V4L/DVB: uvc: Move constants and structures definitions to linux/usb/video.h (diff) | |
| download | linux-1c488ea9d52032d07dd320d31e0720239c93dd64.tar.xz linux-1c488ea9d52032d07dd320d31e0720239c93dd64.zip | |
V4L/DVB: DVB: fix dvr node refcounting
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@suse.cz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb')
| -rw-r--r-- | 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 425862ffb285..0042306ea11b 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); |