Merge remote-tracking branch 'lsk/v3.10/topic/arm64-usb' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / drivers / scsi / sd.c

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 734a29a70f633286226c69372780eb462f64f76d..26b543bc4f53caf9270027e8d5e297612c82cf78 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2627,14 +2627,23 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
 {
        struct scsi_device *sdev = sdkp->device;
 
+       if (sdev->host->no_write_same) {
+               sdev->no_write_same = 1;
+
+               return;
+       }
+
        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;
        }