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authorNamjae Jeon <namjae.jeon@samsung.com>2012-07-07 23:05:08 -0400
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 08:59:00 +0100
commitb81478d82e389dd0961760f5ff6f56b50d29db6d (patch)
tree28729e5443db79591b693dea481b23d5511f37d1 /drivers/scsi
parent365a7150094114a0f8ef0b6164e6b04b519039e8 (diff)
downloadlinux-b81478d82e389dd0961760f5ff6f56b50d29db6d.tar.bz2
[SCSI] set to WCE if usb cache quirk is present.
Make use of USB quirk method to identify such HDD while reading the cache status in sd_probe(). If cache quirk is present for the HDD, lets assume that cache is enabled and make WCE bit equal to 1. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com> Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/sd.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 6e26db11250a..4df73e52a4f9 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2261,8 +2261,13 @@ bad_sense:
sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
defaults:
- sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
- sdkp->WCE = 0;
+ if (sdp->wce_default_on) {
+ sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
+ sdkp->WCE = 1;
+ } else {
+ sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
+ sdkp->WCE = 0;
+ }
sdkp->RCD = 0;
sdkp->DPOFUA = 0;
}