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authorSeongJae Park <sj@kernel.org>2022-08-31 16:58:24 +0000
committerJuergen Gross <jgross@suse.com>2022-09-02 11:05:15 +0200
commitfe8f65b018effbf473f53af3538d0c1878b8b329 (patch)
tree9a761bc67f2f776c0ba209f2be993e9a04804cdf
parent9f5e0fe5d05f7e8de7f39b2b10089834eb0ff787 (diff)
xen-blkfront: Cache feature_persistent value before advertisement
Xen blkfront advertises its support of the persistent grants feature when it first setting up and when resuming in 'talk_to_blkback()'. Then, blkback reads the advertised value when it connects with blkfront and decides if it will use the persistent grants feature or not, and advertises its decision to blkfront. Blkfront reads the blkback's decision and it also makes the decision for the use of the feature. Commit 402c43ea6b34 ("xen-blkfront: Apply 'feature_persistent' parameter when connect"), however, made the blkfront's read of the parameter for disabling the advertisement, namely 'feature_persistent', to be done when it negotiate, not when advertise. Therefore blkfront advertises without reading the parameter. As the field for caching the parameter value is zero-initialized, it always advertises as the feature is disabled, so that the persistent grants feature becomes always disabled. This commit fixes the issue by making the blkfront does parmeter caching just before the advertisement. Fixes: 402c43ea6b34 ("xen-blkfront: Apply 'feature_persistent' parameter when connect") Cc: <stable@vger.kernel.org> # 5.10.x Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Signed-off-by: SeongJae Park <sj@kernel.org> Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20220831165824.94815-4-sj@kernel.org Signed-off-by: Juergen Gross <jgross@suse.com>
-rw-r--r--drivers/block/xen-blkfront.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 276b2ee2a155..1f85750f981e 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1759,6 +1759,12 @@ abort_transaction:
return err;
}
+/* Enable the persistent grants feature. */
+static bool feature_persistent = true;
+module_param(feature_persistent, bool, 0644);
+MODULE_PARM_DESC(feature_persistent,
+ "Enables the persistent grants feature");
+
/* Common code used when first setting up, and when resuming. */
static int talk_to_blkback(struct xenbus_device *dev,
struct blkfront_info *info)
@@ -1850,6 +1856,7 @@ again:
message = "writing protocol";
goto abort_transaction;
}
+ info->feature_persistent_parm = feature_persistent;
err = xenbus_printf(xbt, dev->nodename, "feature-persistent", "%u",
info->feature_persistent_parm);
if (err)
@@ -1919,12 +1926,6 @@ static int negotiate_mq(struct blkfront_info *info)
return 0;
}
-/* Enable the persistent grants feature. */
-static bool feature_persistent = true;
-module_param(feature_persistent, bool, 0644);
-MODULE_PARM_DESC(feature_persistent,
- "Enables the persistent grants feature");
-
/*
* Entry point to this code when a new device is created. Allocate the basic
* structures and the ring buffer for communication with the backend, and
@@ -2284,7 +2285,6 @@ static void blkfront_gather_backend_features(struct blkfront_info *info)
if (xenbus_read_unsigned(info->xbdev->otherend, "feature-discard", 0))
blkfront_setup_discard(info);
- info->feature_persistent_parm = feature_persistent;
if (info->feature_persistent_parm)
info->feature_persistent =
!!xenbus_read_unsigned(info->xbdev->otherend,