From: Tomas Henzl <thenzl@redhat.com>
Date: Sun, 29 Aug 2010 15:49:08 -0400
Subject: [block] cciss: factor out error processing code
Message-id: <1283097002-3341-10-git-send-email-thenzl@redhat.com>
Patchwork-id: 27854
O-Subject: [RHEL6 PATCH 09/63] cciss: Factor out error processing code in
	sendcmd_withirq
Bugzilla: 568830
RH-Acked-by: Neil Horman <nhorman@redhat.com>

Factor out the code for processing errors which occur in sendcmd_withirq

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4261f1a..8d3fe73 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2349,26 +2349,12 @@ static int check_target_status(ctlr_info_t *h, CommandList_struct *c)
 	return IO_ERROR;
 }
 
-static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c)
+static int process_sendcmd_error(ctlr_info_t *h, CommandList_struct *c)
 {
-	DECLARE_COMPLETION_ONSTACK(wait);
-	u64bit  buff_dma_handle;
-	unsigned long flags;
 	int return_status = IO_OK;
-resend_cmd2:
-	c->waiting = &wait;
-	/* Put the request on the tail of the queue and send it */
-	spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
-	addQ(&h->reqQ, c);
-	h->Qdepth++;
-	start_io(h);
-	spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
-
-	wait_for_completion(&wait);
-
-	if (c->err_info->CommandStatus == 0)
-		goto command_done;
 
+	if (c->err_info->CommandStatus == CMD_SUCCESS)
+		return IO_OK;	
 
 	switch (c->err_info->CommandStatus) {
 	case CMD_TARGET_STATUS:
@@ -2410,17 +2396,7 @@ resend_cmd2:
 	case CMD_UNSOLICITED_ABORT:
 		printk(KERN_WARNING "cciss%d: unsolicited abort %02x\n",
 			h->ctlr, c->Request.CDB[0]);
-		if (c->retry_count < MAX_CMD_RETRIES) {
-			printk(KERN_WARNING "cciss%d: retrying %02x\n", h->ctlr,
-				c->Request.CDB[0]);
-			c->retry_count++;
-			/* erase the old error information */
-			memset(c->err_info, 0, sizeof(ErrorInfo_struct));
-			return_status = IO_OK;
-			INIT_COMPLETION(wait);
-			goto resend_cmd2;
-		}
-		return_status = IO_ERROR;
+		return_status = IO_NEEDS_RETRY;
 		break;
 	default:
 		printk(KERN_WARNING "cciss: cmd 0x%02x returned "
@@ -2428,6 +2404,44 @@ resend_cmd2:
 			c->err_info->CommandStatus);
 		return_status = IO_ERROR;
  	}	
+	return return_status;
+}
+
+static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c,
+	int attempt_retry)
+{
+	DECLARE_COMPLETION_ONSTACK(wait);
+	u64bit  buff_dma_handle;
+	unsigned long flags;
+	int return_status = IO_OK;
+
+resend_cmd2:
+	c->waiting = &wait;
+	/* Put the request on the tail of the queue and send it */
+	spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+	addQ(&h->reqQ, c);
+	h->Qdepth++;
+	start_io(h);
+	spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+
+	wait_for_completion(&wait);
+
+	if (c->err_info->CommandStatus == 0 || !attempt_retry)
+		goto command_done;
+
+	return_status = process_sendcmd_error(h, c);
+
+	if (return_status == IO_NEEDS_RETRY &&
+	c->retry_count < MAX_CMD_RETRIES) {
+		printk(KERN_WARNING "cciss%d: retrying 0x%02x\n", h->ctlr,
+		c->Request.CDB[0]);
+		c->retry_count++;
+		/* erase the old error information */
+		memset(c->err_info, 0, sizeof(ErrorInfo_struct));
+		return_status = IO_OK;
+		INIT_COMPLETION(wait);
+		goto resend_cmd2;
+ 	}
  
 command_done:
  	/* unlock the buffers from DMA */
@@ -2453,7 +2467,7 @@ static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
 	return_status = fill_cmd(c, cmd, ctlr, buff, size, page_code,
 		scsi3addr, cmd_type);
 	if (return_status == IO_OK)
-		return_status = sendcmd_withirq_core(h, c);
+		return_status = sendcmd_withirq_core(h, c, 1);
 	cmd_free(h, c, 0);
 	return return_status;
 }
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index a487415..77052c5 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -11,6 +11,7 @@
 
 #define IO_OK		0
 #define IO_ERROR	1
+#define IO_NEEDS_RETRY	3
 
 #define VENDOR_LEN	8
 #define MODEL_LEN	16