hpsa: do not ack controller events on controllers that do not support it

Acking controller events on controllers that do not support
it can cause such controllers to lock up.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Joe Handzik <joseph.t.handzik@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 5abd49d85940..afd192d2d27d 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -6674,6 +6674,9 @@ static void hpsa_ack_ctlr_events(struct ctlr_info *h)
         int i;
         char *event_type;
 
+        if (!(h->fw_support & MISC_FW_EVENT_NOTIFY))
+                return;
+
         /* Ask the controller to clear the events we're handling. */
         if ((h->transMethod & (CFGTBL_Trans_io_accel1
                         | CFGTBL_Trans_io_accel2)) &&