linux-kernel - [PATCH 3.8 023/152] [SCSI] sd: Reduce buffer size for vpd request

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Date:	Fri,  6 Dec 2013 15:09:07 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>,
	James Bottomley <JBottomley@...allels.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 023/152] [SCSI] sd: Reduce buffer size for vpd request

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

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

From: Bernd Schubert <bernd.schubert@...m.fraunhofer.de>

commit af73623f5f10eb3832c87a169b28f7df040a875b upstream.

Somehow older areca firmware versions have issues with
scsi_get_vpd_page() and a large buffer, the firmware
seems to crash and the scsi error-handler will start endless
recovery retries.
Limiting the buf-size to 64-bytes fixes this issue with older
firmware versions (<1.49 for my controller).

Fixes a regression with areca controllers and older firmware versions
introduced by commit: 66c28f97120e8a621afd5aa7a31c4b85c547d33d

Reported-by: Nix <nix@...eri.org.uk>
Tested-by: Nix <nix@...eri.org.uk>
Signed-off-by: Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
Acked-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/scsi/sd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index bc108d2..a4dc067 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2640,13 +2640,16 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
 	struct scsi_device *sdev = sdkp->device;
 
 	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
+		/* too large values might cause issues with arcmsr */
+		int vpd_buf_len = 64;
+
 		sdev->no_report_opcodes = 1;
 
 		/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
 		 * CODES is unsupported and the device has an ATA
 		 * Information VPD page (SAT).
 		 */
-		if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
+		if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
 			sdev->no_write_same = 1;
 	}
 
-- 
1.8.3.2

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