From: Chris Rankin Date: Sat, 24 Sep 2011 19:54:58 +0000 (-0300) Subject: [media] em28xx: fix deadlock when unplugging and replugging a DVB adapter X-Git-Tag: MMI-PSA29.97-13-9~18177^2~61 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b868a537b675eed2ba84bbeca4c8557ebf9e0156;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git [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 Signed-off-by: Mauro Carvalho Chehab --- 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);