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authorJames Bottomley <jejb@mulgrave.(none)>2005-05-26 14:14:55 -0400
committerJames Bottomley <jejb@mulgrave.(none)>2005-05-26 14:14:55 -0400
commit153b1e1fd957861e2c185473dd3c3d93561066e4 (patch)
treec296359e8212ed83c2834b20a62b7a650f3d0fc2 /drivers/block
parentcdbbde14cb55dd10771ce79154f787322d88411b (diff)
parentc3e9dda4f5702ee5b346f4770de53f79e8ad1d8d (diff)
Automatic merge of ../scsi-misc-2.6-old/
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/elevator.c13
-rw-r--r--drivers/block/ll_rw_blk.c20
-rw-r--r--drivers/block/paride/pd.c2
-rw-r--r--drivers/block/sx8.c4
4 files changed, 22 insertions, 17 deletions
diff --git a/drivers/block/elevator.c b/drivers/block/elevator.c
index 6b79b431462..8c51d1ccebb 100644
--- a/drivers/block/elevator.c
+++ b/drivers/block/elevator.c
@@ -291,6 +291,13 @@ void elv_requeue_request(request_queue_t *q, struct request *rq)
}
/*
+ * the request is prepped and may have some resources allocated.
+ * allowing unprepped requests to pass this one may cause resource
+ * deadlock. turn on softbarrier.
+ */
+ rq->flags |= REQ_SOFTBARRIER;
+
+ /*
* if iosched has an explicit requeue hook, then use that. otherwise
* just put the request at the front of the queue
*/
@@ -386,6 +393,12 @@ struct request *elv_next_request(request_queue_t *q)
if (ret == BLKPREP_OK) {
break;
} else if (ret == BLKPREP_DEFER) {
+ /*
+ * the request may have been (partially) prepped.
+ * we need to keep this request in the front to
+ * avoid resource deadlock. turn on softbarrier.
+ */
+ rq->flags |= REQ_SOFTBARRIER;
rq = NULL;
break;
} else if (ret == BLKPREP_KILL) {
diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
index 11ef9d9ea13..f20eba22b14 100644
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -2038,7 +2038,6 @@ EXPORT_SYMBOL(blk_requeue_request);
* @rq: request to be inserted
* @at_head: insert request at head or tail of queue
* @data: private data
- * @reinsert: true if request it a reinsertion of previously processed one
*
* Description:
* Many block devices need to execute commands asynchronously, so they don't
@@ -2053,8 +2052,9 @@ EXPORT_SYMBOL(blk_requeue_request);
* host that is unable to accept a particular command.
*/
void blk_insert_request(request_queue_t *q, struct request *rq,
- int at_head, void *data, int reinsert)
+ int at_head, void *data)
{
+ int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
unsigned long flags;
/*
@@ -2071,20 +2071,12 @@ void blk_insert_request(request_queue_t *q, struct request *rq,
/*
* If command is tagged, release the tag
*/
- if (reinsert)
- blk_requeue_request(q, rq);
- else {
- int where = ELEVATOR_INSERT_BACK;
-
- if (at_head)
- where = ELEVATOR_INSERT_FRONT;
+ if (blk_rq_tagged(rq))
+ blk_queue_end_tag(q, rq);
- if (blk_rq_tagged(rq))
- blk_queue_end_tag(q, rq);
+ drive_stat_acct(rq, rq->nr_sectors, 1);
+ __elv_add_request(q, rq, where, 0);
- drive_stat_acct(rq, rq->nr_sectors, 1);
- __elv_add_request(q, rq, where, 0);
- }
if (blk_queue_plugged(q))
__generic_unplug_device(q);
else
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 202a5a74ad3..fa49d62626b 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -723,7 +723,7 @@ static int pd_special_command(struct pd_unit *disk,
rq.ref_count = 1;
rq.waiting = &wait;
rq.end_io = blk_end_sync_rq;
- blk_insert_request(disk->gd->queue, &rq, 0, func, 0);
+ blk_insert_request(disk->gd->queue, &rq, 0, func);
wait_for_completion(&wait);
rq.waiting = NULL;
if (rq.errors)
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 797f5988c2b..5ed3a637945 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -614,7 +614,7 @@ static int carm_array_info (struct carm_host *host, unsigned int array_idx)
spin_unlock_irq(&host->lock);
DPRINTK("blk_insert_request, tag == %u\n", idx);
- blk_insert_request(host->oob_q, crq->rq, 1, crq, 0);
+ blk_insert_request(host->oob_q, crq->rq, 1, crq);
return 0;
@@ -653,7 +653,7 @@ static int carm_send_special (struct carm_host *host, carm_sspc_t func)
crq->msg_bucket = (u32) rc;
DPRINTK("blk_insert_request, tag == %u\n", idx);
- blk_insert_request(host->oob_q, crq->rq, 1, crq, 0);
+ blk_insert_request(host->oob_q, crq->rq, 1, crq);
return 0;
}