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[SCSI] sd: Reduce buffer size for vpd request 

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: 66c28f9712

Reported-by: Nix <nix@esperi.org.uk>
Tested-by: Nix <nix@esperi.org.uk>
Signed-off-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Cc: stable@vger.kernel.org # delay inclusion for 2 months for testing
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Bernd Schubert 2013-09-23 14:47:32 +02:00 committed by James Bottomley
parent 51d648af58
commit af73623f5f
1 changed files with 4 additions and 1 deletions
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5
drivers/scsi/sd.c
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@ -2639,13 +2639,16 @@ 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;
}