[PATCH] Staging: hv: fix sleeping while atomic issue
gregkh at suse.de
Fri Dec 10 17:35:19 UTC 2010
On Fri, Dec 10, 2010 at 05:00:01PM +0200, Timo Teräs wrote:
> osd_schedule_callback() is called from VmbusOnMsgDPC() which runs
> in a tasklet. Avoid possible sleeping by using GFP_ATOMIC for the
> memory allocation.
> Seems to fix #16701.
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16701
> Cc: Haiyang Zhang <haiyangz at microsoft.com>
> Cc: Hank Janssen <hjanssen at microsoft.com>
> Signed-off-by: Timo Teräs <timo.teras at iki.fi>
> drivers/staging/hv/osd.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
> diff --git a/drivers/staging/hv/osd.c b/drivers/staging/hv/osd.c
> index 8c3eb27..eb9b20d 100644
> --- a/drivers/staging/hv/osd.c
> +++ b/drivers/staging/hv/osd.c
> @@ -214,7 +214,7 @@ int osd_schedule_callback(struct workqueue_struct *wq,
> struct osd_callback_struct *cb;
> - cb = kmalloc(sizeof(*cb), GFP_KERNEL);
> + cb = kmalloc(sizeof(*cb), GFP_ATOMIC);
How about just fixing the one place where this is needed? You don't
need this for all of the osd_schedule_callback() functions, right?
Actually, we should unroll this function entirely and use the "real"
functions the kernel provides us. I'd much rather see that fix than
this one which just papers over the problem.
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