A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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[SCSI] set to WCE if usb cache quirk is present.

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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 <[email protected]>
Signed-off-by: Pankaj Kumar <[email protected]>
Signed-off-by: Amit Sahrawat <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Namjae Jeon 2012-07-07 23:05:08 -04:00 • committed by James Bottomley
commit b81478d82e
2 changed files with 8 additions and 2 deletions
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9
drivers/scsi/sd.c
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@ -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;
}