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 5cbc69ff338186728195b572d8885a4e61b7b5e7..67583692d95851ccd72135b739ab1bab86a3afa5 100644 (file)
--- 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;