4.4-stable patches

added patches:
	media-usbtv-fix-deadlock-on-suspend.patch

diff --git a/queue-4.4/media-usbtv-fix-deadlock-on-suspend.patch b/queue-4.4/media-usbtv-fix-deadlock-on-suspend.patch
new file mode 100644 (file)
index 0000000..10e845b
--- /dev/null
+++ b/queue-4.4/media-usbtv-fix-deadlock-on-suspend.patch
@@ -0,0 +1,42 @@
+From 8a7e27fd5cd696ba564a3f62cedef7269cfd0723 Mon Sep 17 00:00:00 2001
+From: Maxim Mikityanskiy <maxtram95@gmail.com>
+Date: Fri, 5 Feb 2021 23:51:39 +0100
+Subject: media: usbtv: Fix deadlock on suspend
+
+From: Maxim Mikityanskiy <maxtram95@gmail.com>
+
+commit 8a7e27fd5cd696ba564a3f62cedef7269cfd0723 upstream.
+
+usbtv doesn't support power management, so on system suspend the
+.disconnect callback of the driver is called. The teardown sequence
+includes a call to snd_card_free. Its implementation waits until the
+refcount of the sound card device drops to zero, however, if its file is
+open, snd_card_file_add takes a reference, which can't be dropped during
+the suspend, because the userspace processes are already frozen at this
+point. snd_card_free waits for completion forever, leading to a hang on
+suspend.
+
+This commit fixes this deadlock condition by replacing snd_card_free
+with snd_card_free_when_closed, that doesn't wait until all references
+are released, allowing suspend to progress.
+
+Fixes: 63ddf68de52e ("[media] usbtv: add audio support")
+Signed-off-by: Maxim Mikityanskiy <maxtram95@gmail.com>
+Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
+Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/media/usb/usbtv/usbtv-audio.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/media/usb/usbtv/usbtv-audio.c
++++ b/drivers/media/usb/usbtv/usbtv-audio.c
+@@ -384,7 +384,7 @@ void usbtv_audio_free(struct usbtv *usbt
+       cancel_work_sync(&usbtv->snd_trigger);
+ 
+       if (usbtv->snd && usbtv->udev) {
+-              snd_card_free(usbtv->snd);
++              snd_card_free_when_closed(usbtv->snd);
+               usbtv->snd = NULL;
+       }
+ }

diff --git a/queue-4.4/series b/queue-4.4/series
index d828ef8cd8d78db0e720356ff85c64e4fc983807..6383436dcecbf60504551ce8868e3fa62c45da1e 100644 (file)
--- a/queue-4.4/series
+++ b/queue-4.4/series
@@ -15,3 +15,4 @@ net-mlx4_en-update-moderation-when-config-reset.patch
 net-lapbether-remove-netif_start_queue-netif_stop_queue.patch
 net-davicom-fix-regulator-not-turned-off-on-failed-probe.patch
 net-davicom-fix-regulator-not-turned-off-on-driver-removal.patch
+media-usbtv-fix-deadlock-on-suspend.patch