linux-kernel - [PATCH 4.17 281/336] scsi: megaraid_sas: Increase timeout by 1 sec for non-RAID fastpath IOs

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Date:   Wed,  1 Aug 2018 18:50:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 281/336] scsi: megaraid_sas: Increase timeout by 1 sec for non-RAID fastpath IOs

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shivasharan S <shivasharan.srikanteshwara@...adcom.com>

[ Upstream commit 3239b8cd28fd849a2023483257d35d68c5876c74 ]

Hardware could time out Fastpath IOs one second earlier than the timeout
provided by the host.

For non-RAID devices, driver provides timeout value based on OS provided
timeout value. Under certain scenarios, if the OS provides a timeout
value of 1 second, due to above behavior hardware will timeout
immediately.

Increase timeout value for non-RAID fastpath IOs by 1 second.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@...adcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -2981,6 +2981,9 @@ megasas_build_syspd_fusion(struct megasa
 		pRAID_Context->timeout_value = cpu_to_le16(os_timeout_value);
 		pRAID_Context->virtual_disk_tgt_id = cpu_to_le16(device_id);
 	} else {
+		if (os_timeout_value)
+			os_timeout_value++;
+
 		/* system pd Fast Path */
 		io_request->Function = MPI2_FUNCTION_SCSI_IO_REQUEST;
 		timeout_limit = (scmd->device->type == TYPE_DISK) ?