diff options
| author | Namjae Jeon <namjae.jeon@samsung.com> | 2012-07-08 05:05:08 +0200 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-07-20 09:59:00 +0200 |
| commit | b81478d82e389dd0961760f5ff6f56b50d29db6d (patch) | |
| tree | 28729e5443db79591b693dea481b23d5511f37d1 /drivers/scsi/sd.c | |
| parent | [SCSI] virtio-scsi: hotplug support for virtio-scsi (diff) | |
| download | linux-b81478d82e389dd0961760f5ff6f56b50d29db6d.tar.xz linux-b81478d82e389dd0961760f5ff6f56b50d29db6d.zip | |
[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/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 9 |
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; } |