From eaa05dfcdb12cf3a7bedf8918dc8699c00944384 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Sat, 7 Jul 2012 23:05:28 -0400 Subject: [SCSI] usb-storage: add support for write cache quirk Add support for write cache quirk on usb hdd. scsi driver will be set to wce by detecting write cache quirk in quirk list when plugging usb hdd. Signed-off-by: Namjae Jeon Signed-off-by: Pankaj Kumar Signed-off-by: Amit Sahrawat Acked-by: Alan Stern Signed-off-by: James Bottomley --- drivers/usb/storage/scsiglue.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/usb/storage/scsiglue.c') diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 11418da9bc09..a3d54366afcc 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -236,6 +236,11 @@ static int slave_configure(struct scsi_device *sdev) US_FL_SCM_MULT_TARG)) && us->protocol == USB_PR_BULK) us->use_last_sector_hacks = 1; + + /* Check if write cache default on flag is set or not */ + if (us->fflags & US_FL_WRITE_CACHE) + sdev->wce_default_on = 1; + } else { /* Non-disk-type devices don't need to blacklist any pages -- cgit v1.2.3