[PATCH 1 08/25] hpsa: fix hpsa_adjust_hpsa_scsi_table

[Don Brace]

Fix a NULL pointer issue in the driver when devices are removed
during a reset.

Signed-off-by: Don Brace <don.br...@pmcs.com>
---
 drivers/block/cciss.h |    1 +
 drivers/scsi/hpsa.c   |   16 ++++++++++++++++
 drivers/scsi/hpsa.h   |    1 +
 3 files changed, 18 insertions(+)

diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 7fda30e..f8b8c6b 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -155,6 +155,7 @@ struct ctlr_info
        size_t reply_pool_size;
        unsigned char reply_pool_wraparound;
        u32 *blockFetchTable;
+       u8 reset_in_progress;
 };
 
 /*  Defining the diffent access_methods
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index ced0d4c..08a761c 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1670,6 +1670,15 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h, 
int hostno,
        int nadded, nremoved;
        struct Scsi_Host *sh = NULL;
 
+       /*
+        * A reset can cause a device status to change
+        * re-schedule the scan to see what happened.
+        */
+       if (h->reset_in_progress) {
+               h->drv_req_rescan = 1;
+               return;
+       }
+
        added = kzalloc(sizeof(*added) * HPSA_MAX_DEVICES, GFP_KERNEL);
        removed = kzalloc(sizeof(*removed) * HPSA_MAX_DEVICES, GFP_KERNEL);
 
@@ -1780,6 +1789,10 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h, 
int hostno,
                goto free_and_out;
 
        sh = h->scsi_host;
+       if (sh == NULL) {
+               dev_warn(&h->pdev->dev, "%s: scsi_host is null\n", __func__);
+               return;
+       }
        /* Notify scsi mid layer of any removed devices */
        for (i = 0; i < nremoved; i++) {
                if (removed[i] == NULL)
@@ -5243,12 +5256,15 @@ static int hpsa_eh_device_reset_handler(struct 
scsi_cmnd *scsicmd)
 
        hpsa_show_dev_msg(KERN_WARNING, h, dev, "resetting");
 
+       h->reset_in_progress = 1;
+
        /* send a reset to the SCSI LUN which the command was sent to */
        rc = hpsa_do_reset(h, dev, dev->scsi3addr, HPSA_RESET_TYPE_LUN,
                           DEFAULT_REPLY_QUEUE);
        snprintf(msg, sizeof(msg), "reset %s",
                 rc == 0 ? "completed successfully" : "failed");
        hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
+       h->reset_in_progress = 0;
        return rc == 0 ? SUCCESS : FAILED;
 }
 
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index b173c0e..dc113c1a 100644
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -271,6 +271,7 @@ struct ctlr_info {
        wait_queue_head_t abort_cmd_wait_queue;
        wait_queue_head_t event_sync_wait_queue;
        struct mutex reset_mutex;
+       u8 reset_in_progress;
 };
 
 struct offline_device_entry {

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