linux-kernel - [PATCH] add regulation of BLK_EH_RESET

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Date:	Wed, 1 Dec 2010 22:40:27 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	linux-scsi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, devel@...n-fcoe.org
Subject: [PATCH] add regulation of BLK_EH_RESET_TIMER for block request

When timer run, if BLK_EH_RESET_TIMER returned by LLD, the retries of
block request, though defined, is not checked in both scsi middle
later and block layer.

Regulation of BLK_EH_RESET_TIMER could help LLD fiddle timer in
reasonable manner.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---

--- a/drivers/scsi/scsi_error.c	2010-11-01 19:54:12.000000000 +0800
+++ b/drivers/scsi/scsi_error.c	2010-12-01 22:26:36.000000000 +0800
@@ -138,8 +138,15 @@ enum blk_eh_timer_return scsi_times_out(
 	else if (scmd->device->host->hostt->eh_timed_out)
 		rtn = scmd->device->host->hostt->eh_timed_out(scmd);

+	if (rtn == BLK_EH_RESET_TIMER)
+		if (req->retries-- > 0)
+			return rtn;
+		else
+			goto handled;
+
 	if (unlikely(rtn == BLK_EH_NOT_HANDLED &&
 		     !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
+ handled:
 		scmd->result |= DID_TIME_OUT << 16;
 		rtn = BLK_EH_HANDLED;
 	}
--
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