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| author | Chris Rankin <rankincj@yahoo.com> | 2011-09-24 16:54:58 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-09-25 09:47:59 -0300 |
| commit | b868a537b675eed2ba84bbeca4c8557ebf9e0156 (patch) | |
| tree | 42a7bd386be97907cbbc3243d5c2cdc3fc0bb2a1 /drivers/media/video/em28xx/em28xx-cards.c | |
| parent | 4a6c4a9567aed23cf7e8134c63f3176a57e5572b (diff) | |
| download | linux-b868a537b675eed2ba84bbeca4c8557ebf9e0156.tar.gz linux-b868a537b675eed2ba84bbeca4c8557ebf9e0156.tar.bz2 linux-b868a537b675eed2ba84bbeca4c8557ebf9e0156.zip | |
[media] em28xx: fix deadlock when unplugging and replugging a DVB adapter
This fixes the deadlock that occurs with either multiple PCTV 290e adapters or when a single PCTV 290e adapter is replugged.
For DVB devices, the device lock must now *not* be held when adding/removing either a device or an extension to the respective lists. (Because em28xx_init_dvb() will want to take the lock instead).
Conversely, for Audio-Only devices, the device lock *must* be held when adding/removing either a device or an extension to the respective lists.
Signed-off-by: Chris Rankin <rankincj@yahoo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-cards.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-cards.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c index 7297d909fb6b..2e1c1214c38f 100644 --- a/drivers/media/video/em28xx/em28xx-cards.c +++ b/drivers/media/video/em28xx/em28xx-cards.c @@ -3005,7 +3005,9 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, goto fail; } + mutex_unlock(&dev->lock); em28xx_init_extension(dev); + mutex_lock(&dev->lock); /* Save some power by putting tuner to sleep */ v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_power, 0); @@ -3301,10 +3303,10 @@ static void em28xx_usb_disconnect(struct usb_interface *interface) em28xx_release_resources(dev); } - em28xx_close_extension(dev); - mutex_unlock(&dev->lock); + em28xx_close_extension(dev); + if (!dev->users) { kfree(dev->alt_max_pkt_size); kfree(dev); |