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device-dax: Fix error path in dax_driver_register

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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>
Link: https://lore.kernel.org/r/20210205222842.34896-4-uwe@kleine-koenig.org
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Uwe Kleine-König 2021-02-05 23:28:40 +01:00 committed by Dan Williams
parent 8029968e2a
commit e307bf11c5
1 changed files with 9 additions and 1 deletions
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10
drivers/dax/bus.c
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@ -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);