SCSI: sd: Reduce buffer size for vpd request

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@esperi.org.uk>
Tested-by: Nix <nix@esperi.org.uk>
Signed-off-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 9bc913b92d13..26b543bc4f53 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2634,13 +2634,16 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
         }
 
         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;
         }