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authorJiri Slaby <jslaby@suse.cz>2010-07-18 15:34:18 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-08-02 16:43:16 -0300
commit1c488ea9d52032d07dd320d31e0720239c93dd64 (patch)
tree7de7d816c2bf4dfbf92322c13dd39e398ff45f27
parentbbafc0cb6c52c40647f561854db5fbac4d608186 (diff)
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>
-rw-r--r--drivers/media/dvb/dvb-core/dmxdev.c2
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 425862ffb28..0042306ea11 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);