From: Brian King <brking@us.ibm.com>
Date: Fri, 24 Feb 2006 23:10:04 +0000 (-0600)
Subject: [SCSI] scsi: scsi command retries off by one fix
X-Git-Tag: v2.6.16-rc6~139^2~3
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=8884efab1516613215816d48132dd724508970bf;p=linux-2.6-omap-h63xx.git

[SCSI] scsi: scsi command retries off by one fix

Fix up an off by one error in calculating retries for scsi
commands. This bug was discovered when an SG_IO request
was sent to scsi core with retries = 0, causing the overall
timeout check to go off in scsi_softirq_done.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
---

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 5cc97b72166..ff82ccfbb10 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1308,7 +1308,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
 	 * the request was not marked fast fail.  Note that above,
 	 * even if the request is marked fast fail, we still requeue
 	 * for queue congestion conditions (QUEUE_FULL or BUSY) */
-	if ((++scmd->retries) < scmd->allowed 
+	if ((++scmd->retries) <= scmd->allowed
 	    && !blk_noretry_request(scmd->request)) {
 		return NEEDS_RETRY;
 	} else {
@@ -1433,7 +1433,7 @@ static void scsi_eh_flush_done_q(struct list_head *done_q)
 		list_del_init(&scmd->eh_entry);
 		if (scsi_device_online(scmd->device) &&
 		    !blk_noretry_request(scmd->request) &&
-		    (++scmd->retries < scmd->allowed)) {
+		    (++scmd->retries <= scmd->allowed)) {
 			SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush"
 							  " retry cmd: %p\n",
 							  current->comm,
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 4362dcde74a..701a328f7be 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1498,7 +1498,7 @@ static void scsi_kill_request(struct request *req, request_queue_t *q)
 static void scsi_softirq_done(struct request *rq)
 {
 	struct scsi_cmnd *cmd = rq->completion_data;
-	unsigned long wait_for = cmd->allowed * cmd->timeout_per_command;
+	unsigned long wait_for = (cmd->allowed + 1) * cmd->timeout_per_command;
 	int disposition;
 
 	INIT_LIST_HEAD(&cmd->eh_entry);