[PATCH V2 11/36] smartpqi: add pqi_wait_for_completion_io

[Don Brace]

From: Kevin Barnett <kevin.barn...@hpe.com>

Add check for controller lockup during waits for synchronous
controller commands.

Reviewed-by: Scott Benesh <scott.ben...@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barn...@microsemi.com>
Signed-off-by: Don Brace <don.br...@microsemi.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c |   33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c 
b/drivers/scsi/smartpqi/smartpqi_init.c
index 6f31cd9..586a1d5 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -3578,6 +3578,37 @@ static void pqi_start_io(struct pqi_ctrl_info *ctrl_info,
        spin_unlock_irqrestore(&queue_group->submit_lock[path], flags);
 }
 
+#define PQI_WAIT_FOR_COMPLETION_IO_TIMEOUT_SECS                10
+
+static int pqi_wait_for_completion_io(struct pqi_ctrl_info *ctrl_info,
+       struct completion *wait)
+{
+       int rc;
+       unsigned int wait_secs = 0;
+
+       while (1) {
+               if (wait_for_completion_io_timeout(wait,
+                       PQI_WAIT_FOR_COMPLETION_IO_TIMEOUT_SECS * HZ)) {
+                       rc = 0;
+                       break;
+               }
+
+               pqi_check_ctrl_health(ctrl_info);
+               if (pqi_ctrl_offline(ctrl_info)) {
+                       rc = -ENXIO;
+                       break;
+               }
+
+               wait_secs += PQI_WAIT_FOR_COMPLETION_IO_TIMEOUT_SECS;
+
+               dev_err(&ctrl_info->pci_dev->dev,
+                       "waiting %u seconds for completion\n",
+                       wait_secs);
+       }
+
+       return rc;
+}
+
 static void pqi_raid_synchronous_complete(struct pqi_io_request *io_request,
        void *context)
 {
@@ -3601,7 +3632,7 @@ static int 
pqi_submit_raid_request_synchronous_with_io_request(
                io_request);
 
        if (timeout_msecs == NO_TIMEOUT) {
-               wait_for_completion_io(&wait);
+               pqi_wait_for_completion_io(ctrl_info, &wait);
        } else {
                if (!wait_for_completion_io_timeout(&wait,
                        msecs_to_jiffies(timeout_msecs))) {