Commit b81478d8 authored by Namjae Jeon's avatar Namjae Jeon Committed by James Bottomley

[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: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarPankaj Kumar <pankaj.km@samsung.com>
Signed-off-by: default avatarAmit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 365a7150
......@@ -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;
}
......
......@@ -154,6 +154,7 @@ struct scsi_device {
unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
unsigned is_visible:1; /* is the device visible in sysfs */
unsigned wce_default_on:1; /* Cache is ON by default */
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
struct list_head event_list; /* asserted events */
......
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