staging: unisys: visorbus: add timeout to controlvm_periodic_work
Limit the amount that gets pulled from the queue on each try so we don't
get stuck in an infinite loop if something has gone wrong with the s-Par
firmware.
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index 5cbc69f..6758369 100644
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -1785,6 +1785,7 @@ static void
controlvm_periodic_work(struct work_struct *work)
{
struct controlvm_message inmsg;
+ int count = 0;
int err;
/* Drain the RESPONSE queue make it empty */
@@ -1792,7 +1793,7 @@ controlvm_periodic_work(struct work_struct *work)
err = visorchannel_signalremove(chipset_dev->controlvm_channel,
CONTROLVM_QUEUE_RESPONSE,
&inmsg);
- } while (!err);
+ } while ((!err) && (++count < CONTROLVM_MESSAGE_MAX));
if (err != -EAGAIN)
goto schedule_out;