hpsa: abandon rescans on memory alloaction failures.

Abandon and reschedule rescan process only if device inquiries
fail due to mem alloc failures, which are likely to occur for
all devices.

Otherwise, skip device if inquiry fails for other reasons,
and continue rescanning process for other devices.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Reviewed-by: Justin Lindley <justin.lindley@pmcs.com>
Reviewed-by: Kevin Barnett <kevin.barnett@pmcs.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Orabug: 23064595
Signed-off-by: Manjunath Govindashetty <manjunath.govindashetty@oracle.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 5c06f0d0a34cb73d8673a31dc6a6576ad6f0472f..6c4ea27a61d29f9691714d6b421e7db573395d01 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3366,10 +3366,13 @@ static int hpsa_update_device_info(struct ctlr_info *h,
 
        unsigned char *inq_buff;
        unsigned char *obdr_sig;
+       int rc = 0;
 
        inq_buff = kzalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
-       if (!inq_buff)
+       if (!inq_buff) {
+               rc = -ENOMEM;
                goto bail_out;
+       }
 
        /* Do an inquiry to the device to see what it is. */
        if (hpsa_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
@@ -3377,6 +3380,7 @@ static int hpsa_update_device_info(struct ctlr_info *h,
                /* Inquiry failed (msg printed already) */
                dev_err(&h->pdev->dev,
                        "hpsa_update_device_info: inquiry failed\n");
+               rc = -EIO;
                goto bail_out;
        }
 
@@ -3426,7 +3430,7 @@ static int hpsa_update_device_info(struct ctlr_info *h,
 
 bail_out:
        kfree(inq_buff);
-       return 1;
+       return rc;
 }
 
 static void hpsa_update_device_supports_aborts(struct ctlr_info *h,
@@ -3794,6 +3798,7 @@ static void hpsa_update_scsi_devices(struct ctlr_info *h)
        n_ext_target_devs = 0;
        for (i = 0; i < nphysicals + nlogicals + 1; i++) {
                u8 *lunaddrbytes, is_OBDR = 0;
+               int rc = 0;
 
                /* Figure out where the LUN ID info is coming from */
                lunaddrbytes = figure_lunaddrbytes(h, raid_ctlr_position,
@@ -3806,11 +3811,20 @@ static void hpsa_update_scsi_devices(struct ctlr_info *h)
                                continue;
 
                /* Get device type, vendor, model, device id */
-               if (hpsa_update_device_info(h, lunaddrbytes, tmpdevice,
-                                                       &is_OBDR)) {
+               rc = hpsa_update_device_info(h, lunaddrbytes, tmpdevice,
+                                                       &is_OBDR);
+               if (rc == -ENOMEM) {
+                       dev_warn(&h->pdev->dev,
+                               "Out of memory, rescan deferred.\n");
                        h->drv_req_rescan = 1;
-                       continue; /* skip it if we can't talk to it. */
+                       goto out;
                }
+               if (rc) {
+                       dev_warn(&h->pdev->dev,
+                               "Inquiry failed, skipping device.\n");
+                       continue;
+               }
+
                figure_bus_target_lun(h, lunaddrbytes, tmpdevice);
                hpsa_update_device_supports_aborts(h, tmpdevice, lunaddrbytes);
                this_device = currentsd[ncurrent];