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From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>
Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH 2/3] dax-device: Fix error path in dax_driver_register
Date: Thu, 28 Jan 2021 00:01:23 +0100	[thread overview]
Message-ID: <20210127230124.109522-2-uwe@kleine-koenig.org> (raw)
In-Reply-To: <20210127230124.109522-1-uwe@kleine-koenig.org>

The static variable match_always_count is supposed to track if there is
a driver registered that has .match_always set. If driver_register()
fails, the previous increment must be undone.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
---
 drivers/dax/bus.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 618d462975ba..498c60333d60 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -1417,7 +1417,15 @@ int __dax_driver_register(struct dax_device_driver *dax_drv,
 	mutex_unlock(&dax_bus_lock);
 	if (rc)
 		return rc;
-	return driver_register(drv);
+
+	rc = driver_register(drv);
+	if (rc && dax_drv->match_always) {
+		mutex_lock(&dax_bus_lock);
+		match_always_count -= dax_drv->match_always;
+		mutex_unlock(&dax_bus_lock);
+	}
+
+	return rc;
 }
 EXPORT_SYMBOL_GPL(__dax_driver_register);
 
-- 
2.29.2
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WARNING: multiple messages have this Message-ID (diff)
From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>
Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH 2/3] dax-device: Fix error path in dax_driver_register
Date: Thu, 28 Jan 2021 00:01:23 +0100	[thread overview]
Message-ID: <20210127230124.109522-2-uwe@kleine-koenig.org> (raw)
In-Reply-To: <20210127230124.109522-1-uwe@kleine-koenig.org>

The static variable match_always_count is supposed to track if there is
a driver registered that has .match_always set. If driver_register()
fails, the previous increment must be undone.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
---
 drivers/dax/bus.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 618d462975ba..498c60333d60 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -1417,7 +1417,15 @@ int __dax_driver_register(struct dax_device_driver *dax_drv,
 	mutex_unlock(&dax_bus_lock);
 	if (rc)
 		return rc;
-	return driver_register(drv);
+
+	rc = driver_register(drv);
+	if (rc && dax_drv->match_always) {
+		mutex_lock(&dax_bus_lock);
+		match_always_count -= dax_drv->match_always;
+		mutex_unlock(&dax_bus_lock);
+	}
+
+	return rc;
 }
 EXPORT_SYMBOL_GPL(__dax_driver_register);
 
-- 
2.29.2


  reply	other threads:[~2021-01-27 23:01 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-27 23:01 [PATCH 1/3] device-dax: Prevent registering drivers without probe or remove callback Uwe Kleine-König
2021-01-27 23:01 ` Uwe Kleine-König
2021-01-27 23:01 ` Uwe Kleine-König [this message]
2021-01-27 23:01   ` [PATCH 2/3] dax-device: Fix error path in dax_driver_register Uwe Kleine-König
2021-01-27 23:01 ` [PATCH 3/3] dax-device: Make remove callback return void Uwe Kleine-König
2021-01-27 23:01   ` Uwe Kleine-König

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