Em Sat, 12 Mar 2016 17:37:05 -0700
Shuah Khan <shuahkh@xxxxxxxxxxxxxxx> escreveu:
> Change media_add_link() and media_devnode_create() to dump_stack when
> called in atomic context.
>
> Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
> Suggested-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Just to be clear: my suggestion is to use this in order to help you to
debug the issues with au0828/snd-usb-audio, that are sometimes producing
those Kernel messages:
[ 23.267197] BUG: sleeping function called from invalid context at mm/slub.c:1289
But I don't think that should patch should be merged upstream.
Regards,
Mauro
> ---
> drivers/media/media-entity.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
> index e95070b..66a5392 100644
> --- a/drivers/media/media-entity.c
> +++ b/drivers/media/media-entity.c
> @@ -570,6 +570,9 @@ static struct media_link *media_add_link(struct list_head *head)
> {
> struct media_link *link;
>
> + if (in_atomic())
> + dump_stack();
> +
> link = kzalloc(sizeof(*link), GFP_KERNEL);
> if (link == NULL)
> return NULL;
> @@ -891,6 +894,9 @@ struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
> {
> struct media_intf_devnode *devnode;
>
> + if (in_atomic())
> + dump_stack();
> +
> devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
> if (!devnode)
> return NULL;
--
Thanks,
Mauro
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