From af73623f5f10eb3832c87a169b28f7df040a875b Mon Sep 17 00:00:00 2001 From: Bernd Schubert Date: Mon, 23 Sep 2013 14:47:32 +0200 Subject: [PATCH] [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: 66c28f97120e8a621afd5aa7a31c4b85c547d33d Reported-by: Nix Tested-by: Nix Signed-off-by: Bernd Schubert Cc: stable@vger.kernel.org # delay inclusion for 2 months for testing Acked-by: Martin K. Petersen Signed-off-by: James Bottomley --- 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 5693f6d7eddb..ab96b793f904 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -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; }