hpsa: do not check cmd_alloc return value - it cannnot return NULL

cmd_alloc can no longer return NULL, so don't check for NULL any more
(which is unreachable code).

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Reviewed-by: Kevin Barnett <kevin.barnett@pmcs.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Hannes Reinecke <hare@Suse.de>
Signed-off-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index eacfeb724734ca2072daecf17ba633b6cd917c73..d91308993f14d407169d974b2a61d5da34d960a8 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -2468,11 +2468,6 @@ static int hpsa_scsi_do_inquiry(struct ctlr_info *h, unsigned char *scsi3addr,
 
        c = cmd_alloc(h);
 
-       if (c == NULL) {
-               dev_warn(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return -ENOMEM;
-       }
-
        if (fill_cmd(c, HPSA_INQUIRY, h, buf, bufsize,
                        page, scsi3addr, TYPE_CMD)) {
                rc = -1;
@@ -2501,11 +2496,6 @@ static int hpsa_bmic_ctrl_mode_sense(struct ctlr_info *h,
        struct ErrorInfo *ei;
 
        c = cmd_alloc(h);
-       if (c == NULL) {                        /* trouble... */
-               dev_warn(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return -ENOMEM;
-       }
-
        if (fill_cmd(c, BMIC_SENSE_CONTROLLER_PARAMETERS, h, buf, bufsize,
                        page, scsi3addr, TYPE_CMD)) {
                rc = -1;
@@ -2523,7 +2513,7 @@ static int hpsa_bmic_ctrl_mode_sense(struct ctlr_info *h,
 out:
        cmd_free(h, c);
        return rc;
-       }
+}
 
 static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr,
        u8 reset_type, int reply_queue)
@@ -2534,10 +2524,6 @@ static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr,
 
        c = cmd_alloc(h);
 
-       if (c == NULL) {                        /* trouble... */
-               dev_warn(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return -ENOMEM;
-       }
 
        /* fill_cmd can't fail here, no data buffer to map. */
        (void) fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0,
@@ -2665,10 +2651,7 @@ static int hpsa_get_raid_map(struct ctlr_info *h,
        struct ErrorInfo *ei;
 
        c = cmd_alloc(h);
-       if (c == NULL) {
-               dev_warn(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return -ENOMEM;
-       }
+
        if (fill_cmd(c, HPSA_GET_RAID_MAP, h, &this_device->raid_map,
                        sizeof(this_device->raid_map), 0,
                        scsi3addr, TYPE_CMD)) {
@@ -2841,10 +2824,7 @@ static int hpsa_scsi_do_report_luns(struct ctlr_info *h, int logical,
        struct ErrorInfo *ei;
 
        c = cmd_alloc(h);
-       if (c == NULL) {                        /* trouble... */
-               dev_err(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return -1;
-       }
+
        /* address the controller */
        memset(scsi3addr, 0, sizeof(scsi3addr));
        if (fill_cmd(c, logical ? HPSA_REPORT_LOG : HPSA_REPORT_PHYS, h,
@@ -2960,8 +2940,7 @@ static int hpsa_volume_offline(struct ctlr_info *h,
 #define ASCQ_LUN_NOT_READY_INITIALIZING_CMD_REQ 0x02
 
        c = cmd_alloc(h);
-       if (!c)
-               return 0;
+
        (void) fill_cmd(c, TEST_UNIT_READY, h, NULL, 0, 0, scsi3addr, TYPE_CMD);
        rc = hpsa_scsi_do_simple_cmd(h, c, DEFAULT_REPLY_QUEUE, NO_TIMEOUT);
        if (rc) {
@@ -3035,8 +3014,7 @@ static int hpsa_device_supports_aborts(struct ctlr_info *h,
                return 1;
 
        c = cmd_alloc(h);
-       if (!c)
-               return -ENOMEM;
+
        (void) fill_cmd(c, HPSA_ABORT_MSG, h, &tag, 0, 0, scsi3addr, TYPE_MSG);
        (void) hpsa_scsi_do_simple_cmd(h, c, DEFAULT_REPLY_QUEUE, NO_TIMEOUT);
        /* no unmap needed here because no data xfer. */
@@ -4607,10 +4585,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
                return 0;
        }
        c = cmd_alloc(h);
-       if (c == NULL) {                        /* trouble... */
-               dev_err(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return SCSI_MLQUEUE_HOST_BUSY;
-       }
+
        if (unlikely(lockup_detected(h))) {
                cmd->result = DID_NO_CONNECT << 16;
                cmd_free(h, c);
@@ -4771,11 +4746,6 @@ static int wait_for_device_to_become_ready(struct ctlr_info *h,
        struct CommandList *c;
 
        c = cmd_alloc(h);
-       if (!c) {
-               dev_warn(&h->pdev->dev, "out of memory in "
-                       "wait_for_device_to_become_ready.\n");
-               return IO_ERROR;
-       }
 
        /* Send test unit ready until device ready, or give up. */
        while (count < HPSA_TUR_RETRY_LIMIT) {
@@ -4928,10 +4898,6 @@ static int hpsa_send_abort(struct ctlr_info *h, unsigned char *scsi3addr,
        __le32 tagupper, taglower;
 
        c = cmd_alloc(h);
-       if (c == NULL) {        /* trouble... */
-               dev_warn(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               return -ENOMEM;
-       }
 
        /* fill_cmd can't fail here, no buffer to map */
        (void) fill_cmd(c, HPSA_ABORT_MSG, h, &abort->Header.tag,
@@ -5217,6 +5183,8 @@ static int hpsa_eh_abort_handler(struct scsi_cmnd *sc)
  * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
  * which ones are free or in use.  Lock must be held when calling this.
  * cmd_free() is the complement.
+ * This function never gives up and returns NULL.  If it hangs,
+ * another thread must call cmd_free() to free some tags.
  */
 
 static struct CommandList *cmd_alloc(struct ctlr_info *h)
@@ -5450,10 +5418,7 @@ static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
                }
        }
        c = cmd_alloc(h);
-       if (c == NULL) {
-               rc = -ENOMEM;
-               goto out_kfree;
-       }
+
        /* Fill in the command type */
        c->cmd_type = CMD_IOCTL_PEND;
        /* Fill in Command Header */
@@ -5589,10 +5554,7 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
                sg_used++;
        }
        c = cmd_alloc(h);
-       if (c == NULL) {
-               status = -ENOMEM;
-               goto cleanup1;
-       }
+
        c->cmd_type = CMD_IOCTL_PEND;
        c->Header.ReplyQueue = 0;
        c->Header.SGList = (u8) sg_used;
@@ -5709,14 +5671,13 @@ static int hpsa_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
        }
 }
 
-static int hpsa_send_host_reset(struct ctlr_info *h, unsigned char *scsi3addr,
+static void hpsa_send_host_reset(struct ctlr_info *h, unsigned char *scsi3addr,
                                u8 reset_type)
 {
        struct CommandList *c;
 
        c = cmd_alloc(h);
-       if (!c)
-               return -ENOMEM;
+
        /* fill_cmd can't fail here, no data buffer to map */
        (void) fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0,
                RAID_CTLR_LUNID, TYPE_MSG);
@@ -5727,7 +5688,7 @@ static int hpsa_send_host_reset(struct ctlr_info *h, unsigned char *scsi3addr,
         * the command either.  This is the last command we will send before
         * re-initializing everything, so it doesn't matter and won't leak.
         */
-       return 0;
+       return;
 }
 
 static int fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
@@ -7121,11 +7082,7 @@ static int hpsa_request_irqs(struct ctlr_info *h,
 
 static int hpsa_kdump_soft_reset(struct ctlr_info *h)
 {
-       if (hpsa_send_host_reset(h, RAID_CTLR_LUNID,
-               HPSA_RESET_TYPE_CONTROLLER)) {
-               dev_warn(&h->pdev->dev, "Resetting array controller failed.\n");
-               return -EIO;
-       }
+       hpsa_send_host_reset(h, RAID_CTLR_LUNID, HPSA_RESET_TYPE_CONTROLLER);
 
        dev_info(&h->pdev->dev, "Waiting for board to soft reset.\n");
        if (hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_NOT_READY)) {
@@ -7636,10 +7593,7 @@ static void hpsa_flush_cache(struct ctlr_info *h)
                return;
 
        c = cmd_alloc(h);
-       if (!c) {
-               dev_warn(&h->pdev->dev, "cmd_alloc returned NULL!\n");
-               goto out_of_memory;
-       }
+
        if (fill_cmd(c, HPSA_CACHE_FLUSH, h, flush_buf, 4, 0,
                RAID_CTLR_LUNID, TYPE_CMD)) {
                goto out;
@@ -7653,7 +7607,6 @@ out:
                dev_warn(&h->pdev->dev,
                        "error flushing cache on controller\n");
        cmd_free(h, c);
-out_of_memory:
        kfree(flush_buf);
 }