scsi: hpsa: Check for null devices in ioaccel submission patch

Reviewed-by: Scott Benesh <scott.benest@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 82b277b..e5c02d7 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -2499,6 +2499,10 @@ static void complete_scsi_command(struct CommandList *cp)
        }
 
        dev = cmd->device->hostdata;
+       if (!dev) {
+               cmd->result = DID_NO_CONNECT << 16;
+               return hpsa_cmd_free_and_done(h, cp, cmd);
+       }
        c2 = &h->ioaccel2_cmd_pool[cp->cmdindex];
 
        scsi_dma_unmap(cmd); /* undo the DMA mappings */
@@ -4686,6 +4690,9 @@ static int hpsa_scsi_ioaccel_direct_map(struct ctlr_info *h,
        struct scsi_cmnd *cmd = c->scsi_cmd;
        struct hpsa_scsi_dev_t *dev = cmd->device->hostdata;
 
+       if (!dev)
+               return -1;
+
        c->phys_disk = dev;
 
        return hpsa_scsi_ioaccel_queue_command(h, c, dev->ioaccel_handle,
@@ -4762,6 +4769,12 @@ static int hpsa_scsi_ioaccel2_queue_command(struct ctlr_info *h,
        u32 len;
        u32 total_len = 0;
 
+       if (!cmd->device)
+               return -1;
+
+       if (!cmd->device->hostdata)
+               return -1;
+
        BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);
 
        if (fixup_ioaccel_cdb(cdb, &cdb_len)) {
@@ -4870,6 +4883,12 @@ static int hpsa_scsi_ioaccel_queue_command(struct ctlr_info *h,
        struct CommandList *c, u32 ioaccel_handle, u8 *cdb, int cdb_len,
        u8 *scsi3addr, struct hpsa_scsi_dev_t *phys_disk)
 {
+       if (!c->scsi_cmd->device)
+               return -1;
+
+       if (!c->scsi_cmd->device->hostdata)
+               return -1;
+
        /* Try to honor the device's queue depth */
        if (atomic_inc_return(&phys_disk->ioaccel_cmds_out) >
                                        phys_disk->queue_depth) {
@@ -4950,6 +4969,9 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
 #endif
        int offload_to_mirror;
 
+       if (!dev)
+               return -1;
+
        /* check for valid opcode, get LBA and block count */
        switch (cmd->cmnd[0]) {
        case WRITE_6:
@@ -5362,6 +5384,9 @@ static int hpsa_ioaccel_submit(struct ctlr_info *h,
        struct hpsa_scsi_dev_t *dev = cmd->device->hostdata;
        int rc = IO_ACCEL_INELIGIBLE;
 
+       if (!dev)
+               return SCSI_MLQUEUE_HOST_BUSY;
+
        cmd->host_scribble = (unsigned char *) c;
 
        if (dev->offload_enabled) {
@@ -5900,6 +5925,9 @@ static void setup_ioaccel2_abort_cmd(struct CommandList *c, struct ctlr_info *h,
        struct scsi_cmnd *scmd = command_to_abort->scsi_cmd;
        struct hpsa_scsi_dev_t *dev = scmd->device->hostdata;
 
+       if (!dev)
+               return;
+
        /*
         * We're overlaying struct hpsa_tmf_struct on top of something which
         * was allocated as a struct io_accel2_cmd, so we better be sure it
@@ -6020,6 +6048,9 @@ static int hpsa_send_abort_ioaccel2(struct ctlr_info *h,
        struct io_accel2_cmd *c2;
 
        dev = abort->scsi_cmd->device->hostdata;
+       if (!dev)
+               return -1;
+
        if (!dev->offload_enabled && !dev->hba_ioaccel_enabled)
                return -1;