linux-kernel - [PATCH 2/2] xen-blkfront: Apply 'feature

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Date:   Fri, 15 Jul 2022 17:55:21 +0000
From:   SeongJae Park <sj@...nel.org>
To:     roger.pau@...rix.com
Cc:     axboe@...nel.dk, boris.ostrovsky@...cle.com, jgross@...e.com,
        olekstysh@...il.com, andrii.chepurnyi82@...il.com,
        mheyne@...zon.de, xen-devel@...ts.xenproject.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH 2/2] xen-blkfront: Apply 'feature_persistent' parameter when connect

Previous commit made xen-blkback's 'feature_persistent' parameter to
make effect for not only newly created backends but also for every
reconnected backends.  This commit makes xen-blkfront's counterpart
parameter to works in same manner and update the document to avoid any
confusion due to inconsistent behavior of same-named parameters.

Cc: <stable@...r.kernel.org> # 5.10.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 Documentation/ABI/testing/sysfs-driver-xen-blkfront | 2 +-
 drivers/block/xen-blkfront.c                        | 4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-driver-xen-blkfront b/Documentation/ABI/testing/sysfs-driver-xen-blkfront
index 7f646c58832e..4d36c5a10546 100644
--- a/Documentation/ABI/testing/sysfs-driver-xen-blkfront
+++ b/Documentation/ABI/testing/sysfs-driver-xen-blkfront
@@ -15,5 +15,5 @@ KernelVersion:  5.10
 Contact:        Maximilian Heyne <mheyne@...zon.de>
 Description:
                 Whether to enable the persistent grants feature or not.  Note
-                that this option only takes effect on newly created frontends.
+                that this option only takes effect on newly connected frontends.
                 The default is Y (enable).
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 3646c0cae672..4e763701b372 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1988,8 +1988,6 @@ static int blkfront_probe(struct xenbus_device *dev,
 	info->vdevice = vdevice;
 	info->connected = BLKIF_STATE_DISCONNECTED;
 
-	info->feature_persistent = feature_persistent;
-
 	/* Front end dir is a number, which is used as the id. */
 	info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
 	dev_set_drvdata(&dev->dev, info);
@@ -2283,7 +2281,7 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
 	if (xenbus_read_unsigned(info->xbdev->otherend, "feature-discard", 0))
 		blkfront_setup_discard(info);
 
-	if (info->feature_persistent)
+	if (feature_persistent)
 		info->feature_persistent =
 			!!xenbus_read_unsigned(info->xbdev->otherend,
 					       "feature-persistent", 0);
-- 
2.25.1