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From: Stephen M. Cameron on 19 Jul 2010 14:40
From: Stephen M. Cameron <scameron(a)beardog.cce.hp.com>

cciss: Set the performant mode bit in the scsi half of the driver
In a couple of places, the performant mode bit wasn't being set in
the scsi half of the driver, causing commands to seem to hang. Use
enqueue_cmd_and_start_io() where appropriate. This fixes a bug that

echo engage scsi > /proc/driver/cciss/cciss0

would hang.

Signed-off-by: Stephen M. Cameron <scameron(a)beardog.cce.hp.com>
---
drivers/block/cciss_scsi.c | 20 ++------------------
1 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index 8e0a709..3604b72 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -921,7 +921,6 @@ cciss_scsi_do_simple_cmd(ctlr_info_t *c,
unsigned char *buf, int bufsize,
int direction)
{
- unsigned long flags;
DECLARE_COMPLETION_ONSTACK(wait);

cp->cmd_type = CMD_IOCTL_PEND; // treat this like an ioctl
@@ -948,14 +947,7 @@ cciss_scsi_do_simple_cmd(ctlr_info_t *c,
bufsize, DMA_FROM_DEVICE);

cp->waiting = &wait;
-
- /* Put the request on the tail of the request queue */
- spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
- addQ(&c->reqQ, cp);
- c->Qdepth++;
- start_io(c);
- spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
-
+ enqueue_cmd_and_start_io(c, cp);
wait_for_completion(&wait);

/* undo the dma mapping */
@@ -1525,15 +1517,7 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
break;
}
cciss_scatter_gather(c, cp, cmd);
-
- /* Put the request on the tail of the request queue */
-
- spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- addQ(&c->reqQ, cp);
- c->Qdepth++;
- start_io(c);
- spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
-
+ enqueue_cmd_and_start_io(c, cp);
/* the cmd'll come back via intr handler in complete_scsi_command() */
return 0;
}

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Prev: [patch 2/3] x86: sync xsave memory layout with its header for user handling
Next: [PATCH 04/26] cciss: factor out cciss_board_disabled