[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 5cc97b7..ff82ccf 100644 (file)
--- 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 4362dcd..701a328 100644 (file)
--- 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);