linux-kernel - [PATCH] scsi: clear UAC before sending SG

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Message-Id: <20200910101513.2900079-1-huangrandall@google.com>
Date:   Thu, 10 Sep 2020 18:15:13 +0800
From:   Randall Huang <huangrandall@...gle.com>
To:     dgilbert@...erlog.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     huangrandall@...gle.com
Subject: [PATCH] scsi: clear UAC before sending SG_IO

Make sure UAC is clear before sending SG_IO.

Signed-off-by: Randall Huang <huangrandall@...gle.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)