From: Asai Thambi SP <asamymuthupa@micron.com>
Date: Thu, 25 Feb 2016 05:17:32 +0000 (-0800)
Subject: mtip32xx: Avoid issuing standby immediate cmd during FTL rebuild
X-Git-Tag: firefly_0821_release~176^2~4^2~50^2~107
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ef87aef51d0de4220bf9c4de34de89f2716b3398;p=firefly-linux-kernel-4.4.55.git

mtip32xx: Avoid issuing standby immediate cmd during FTL rebuild

commit d8a18d2d8f5de55666c6011ed175939d22c8e3d8 upstream.

Prevent standby immediate command from being issued in remove,
suspend and shutdown paths, while drive is in FTL rebuild process.

Signed-off-by: Selvan Mani <smani@micron.com>
Signed-off-by: Vignesh Gunasekaran <vgunasekaran@micron.com>
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 3457ac8c03e2..deb0c761d5db 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3270,20 +3270,25 @@ out1:
 	return rv;
 }
 
-static void mtip_standby_drive(struct driver_data *dd)
+static int mtip_standby_drive(struct driver_data *dd)
 {
-	if (dd->sr)
-		return;
+	int rv = 0;
 
+	if (dd->sr || !dd->port)
+		return -ENODEV;
 	/*
 	 * Send standby immediate (E0h) to the drive so that it
 	 * saves its state.
 	 */
 	if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
-	    !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))
-		if (mtip_standby_immediate(dd->port))
+	    !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
+	    !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
+		rv = mtip_standby_immediate(dd->port);
+		if (rv)
 			dev_warn(&dd->pdev->dev,
 				"STANDBY IMMEDIATE failed\n");
+	}
+	return rv;
 }
 
 /*
@@ -3341,8 +3346,7 @@ static int mtip_hw_shutdown(struct driver_data *dd)
 	 * Send standby immediate (E0h) to the drive so that it
 	 * saves its state.
 	 */
-	if (!dd->sr && dd->port)
-		mtip_standby_immediate(dd->port);
+	mtip_standby_drive(dd);
 
 	return 0;
 }
@@ -3365,7 +3369,7 @@ static int mtip_hw_suspend(struct driver_data *dd)
 	 * Send standby immediate (E0h) to the drive
 	 * so that it saves its state.
 	 */
-	if (mtip_standby_immediate(dd->port) != 0) {
+	if (mtip_standby_drive(dd) != 0) {
 		dev_err(&dd->pdev->dev,
 			"Failed standby-immediate command\n");
 		return -EFAULT;