Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: Skip I/O merges when disabled
  block: add large command support
  block: replace sizeof(rq->cmd) with BLK_MAX_CDB
  ide: use blk_rq_init() to initialize the request
  block: use blk_rq_init() to initialize the request
  block: rename and export rq_init()
  block: no need to initialize rq->cmd with blk_get_request
  block: no need to initialize rq->cmd in prepare_flush_fn hook
  block/blk-barrier.c:blk_ordered_cur_seq() mustn't be inline
  block/elevator.c:elv_rq_merge_ok() mustn't be inline
  block: make queue flags non-atomic
  block: add dma alignment and padding support to blk_rq_map_kern
  unexport blk_max_pfn
  ps3disk: Remove superfluous cast
  block: make rq_init() do a full memset()
  relay: fix splice problem

5 files changed, 21 insertions, 17 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 07103c399fe0..f6600bfb5bde 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1773,7 +1773,7 @@ static int scsi_debug_slave_alloc(struct scsi_device *sdp)
         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
-        set_bit(QUEUE_FLAG_BIDI, &sdp->request_queue->queue_flags);
+        queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
         return 0;
 }
 
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 221f31e36d26..1eaba6cd80f4 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1771,6 +1771,7 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
         unsigned long flags;
         int rtn;
 
+        blk_rq_init(NULL, &req);
         scmd->request = &req;
         memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 67f412bb4974..d545ad1cf47a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -536,6 +536,9 @@ static void scsi_run_queue(struct request_queue *q)
                !shost->host_blocked && !shost->host_self_blocked &&
                 !((shost->can_queue > 0) &&
                   (shost->host_busy >= shost->can_queue))) {
+
+                int flagset;
+
                 /*
                  * As long as shost is accepting commands and we have
                  * starved queues, call blk_run_queue. scsi_request_fn
@@ -549,19 +552,20 @@ static void scsi_run_queue(struct request_queue *q)
                 sdev = list_entry(shost->starved_list.next,
                                           struct scsi_device, starved_entry);
                 list_del_init(&sdev->starved_entry);
-                spin_unlock_irqrestore(shost->host_lock, flags);
-
+                spin_unlock(shost->host_lock);
+
+                spin_lock(sdev->request_queue->queue_lock);
+                flagset = test_bit(QUEUE_FLAG_REENTER, &q->queue_flags) &&
+                                !test_bit(QUEUE_FLAG_REENTER,
+                                        &sdev->request_queue->queue_flags);
+                if (flagset)
+                        queue_flag_set(QUEUE_FLAG_REENTER, sdev->request_queue);
+                __blk_run_queue(sdev->request_queue);
+                if (flagset)
+                        queue_flag_clear(QUEUE_FLAG_REENTER, sdev->request_queue);
+                spin_unlock(sdev->request_queue->queue_lock);
 
-                if (test_bit(QUEUE_FLAG_REENTER, &q->queue_flags) &&
-                    !test_and_set_bit(QUEUE_FLAG_REENTER,
-                                      &sdev->request_queue->queue_flags)) {
-                        blk_run_queue(sdev->request_queue);
-                        clear_bit(QUEUE_FLAG_REENTER,
-                                  &sdev->request_queue->queue_flags);
-                } else
-                        blk_run_queue(sdev->request_queue);
-
-                spin_lock_irqsave(shost->host_lock, flags);
+                spin_lock(shost->host_lock);
                 if (unlikely(!list_empty(&sdev->starved_entry)))
                         /*
                          * sdev lost a race, and was put back on the
@@ -1585,8 +1589,9 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
 
         blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
 
+        /* New queue, no concurrency on queue_flags */
         if (!shost->use_clustering)
-                clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
+                queue_flag_clear_unlocked(QUEUE_FLAG_CLUSTER, q);
 
         /*
          * set a reasonable default alignment on word boundaries: the
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 7899e3dda9bf..f4461d35ffb9 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -248,8 +248,7 @@ static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
         else
                 q->queuedata = shost;
 
-        set_bit(QUEUE_FLAG_BIDI, &q->queue_flags);
-
+        queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
         return 0;
 }
 
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3cea17dd5dba..01cefbb2d539 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -860,7 +860,6 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
 
 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
 {
-        memset(rq->cmd, 0, sizeof(rq->cmd));
         rq->cmd_type = REQ_TYPE_BLOCK_PC;
         rq->timeout = SD_TIMEOUT;
         rq->cmd[0] = SYNCHRONIZE_CACHE;