rpmb: Remove some useless locking

There is no need for explicit locking when using the ida API, as stated in
the doc related to ida_alloc_range() / ida_free().

So remove rpmb_mutex.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/b1fcc6707ec2b6309d50060fa52ccc2c892afde2.1728507153.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/rpmb-core.c b/drivers/misc/rpmb-core.c
index ad1b5c1a37fa68735e2c6985bb8e170798d2abba..2d653926cdbbb03976496f6034a0024cd0fc5fd4 100644 (file)
--- a/drivers/misc/rpmb-core.c
+++ b/drivers/misc/rpmb-core.c
@@ -13,7 +13,6 @@
 #include <linux/slab.h>
 
 static DEFINE_IDA(rpmb_ida);
-static DEFINE_MUTEX(rpmb_mutex);
 
 /**
  * rpmb_dev_get() - increase rpmb device ref counter
@@ -63,9 +62,7 @@ static void rpmb_dev_release(struct device *dev)
 {
        struct rpmb_dev *rdev = to_rpmb_dev(dev);
 
-       mutex_lock(&rpmb_mutex);
        ida_free(&rpmb_ida, rdev->id);
-       mutex_unlock(&rpmb_mutex);
        kfree(rdev->descr.dev_id);
        kfree(rdev);
 }
@@ -175,9 +172,7 @@ struct rpmb_dev *rpmb_dev_register(struct device *dev,
                goto err_free_rdev;
        }
 
-       mutex_lock(&rpmb_mutex);
        ret = ida_alloc(&rpmb_ida, GFP_KERNEL);
-       mutex_unlock(&rpmb_mutex);
        if (ret < 0)
                goto err_free_dev_id;
        rdev->id = ret;