Merge tag 'pwm/for-4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...

[cascardo/linux.git] / drivers / scsi / sd.c

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3d22fc3..4e08d1c 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2885,10 +2885,13 @@ static int sd_revalidate_disk(struct gendisk *disk)
 
        /*
         * Use the device's preferred I/O size for reads and writes
-        * unless the reported value is unreasonably large (or garbage).
+        * unless the reported value is unreasonably small, large, or
+        * garbage.
         */
-       if (sdkp->opt_xfer_blocks && sdkp->opt_xfer_blocks <= dev_max &&
-           sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS)
+       if (sdkp->opt_xfer_blocks &&
+           sdkp->opt_xfer_blocks <= dev_max &&
+           sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
+           sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_CACHE_SIZE)
                rw_max = q->limits.io_opt =
                        logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
        else