[PATCH] scsi: clear UAC before sending SG_IO

[Randall Huang]

Make sure UAC is clear before sending SG_IO.

Signed-off-by: Randall Huang <huangrand...@google.com>
---
 drivers/scsi/sg.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 20472aaaf630..ad11bca47ae8 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -922,6 +922,7 @@ sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd 
*sfp,
        int result, val, read_only;
        Sg_request *srp;
        unsigned long iflags;
+       int _cmd;
 
        SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
                                   "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
@@ -933,6 +934,13 @@ sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd 
*sfp,
                        return -ENODEV;
                if (!scsi_block_when_processing_errors(sdp->device))
                        return -ENXIO;
+
+               _cmd = SCSI_UFS_REQUEST_SENSE;
+               if (sdp->device->host->wlun_clr_uac) {
+                       sdp->device->host->hostt->ioctl(sdp->device, _cmd, 
NULL);
+                       sdp->device->host->wlun_clr_uac = false;
+               }
+
                result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
                                 1, read_only, 1, &srp);
                if (result < 0)