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Subject[PATCH v2 3/5] dax-device: Fix error path in dax_driver_register
Date
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 2c9e3f6f615f..bc425f1c52bd 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -1420,7 +1420,15 @@ 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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