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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>
This commit is contained in:
David Kershner 2017-04-18 16:55:06 -04:00 committed by Greg Kroah-Hartman
parent d02bde9d37
commit 04dbc09b25
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/unisys/visorbus/visorchipset.c
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@ -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;