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authorChristophe JAILLET <christophe.jaillet@wanadoo.fr>2022-02-07 21:48:19 +0100
committerJens Axboe <axboe@kernel.dk>2022-02-27 22:49:49 +0100
commit24afc15dbe218f860994f627b4ba1fb09225a298 (patch)
treee70955fd091cd9b60af0c4a366c760795f48bd00
parentblock/rnbd: client device does not care queue/rotational (diff)
downloadlinux-24afc15dbe218f860994f627b4ba1fb09225a298.tar.xz
linux-24afc15dbe218f860994f627b4ba1fb09225a298.zip
block/rnbd: Remove a useless mutex
According to lib/idr.c, The IDA handles its own locking. It is safe to call any of the IDA functions without synchronisation in your code. so the 'ida_lock' mutex can just be removed. It is here only to protect some ida_simple_get()/ida_simple_remove() calls. While at it, switch to ida_alloc_XXX()/ida_free() instead to ida_simple_get()/ida_simple_remove(). The latter is deprecated and more verbose. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Acked-by: Jack Wang <jinpu.wang@ionos.com> Link: https://lore.kernel.org/r/7f9eccd8b1fce1bac45ac9b01a78cf72f54c0a61.1644266862.git.christophe.jaillet@wanadoo.fr Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/block/rnbd/rnbd-clt.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/block/rnbd/rnbd-clt.c b/drivers/block/rnbd/rnbd-clt.c
index 9a880d559ab8..1f63f308eb39 100644
--- a/drivers/block/rnbd/rnbd-clt.c
+++ b/drivers/block/rnbd/rnbd-clt.c
@@ -23,7 +23,6 @@ MODULE_LICENSE("GPL");
static int rnbd_client_major;
static DEFINE_IDA(index_ida);
-static DEFINE_MUTEX(ida_lock);
static DEFINE_MUTEX(sess_lock);
static LIST_HEAD(sess_list);
@@ -55,9 +54,7 @@ static void rnbd_clt_put_dev(struct rnbd_clt_dev *dev)
if (!refcount_dec_and_test(&dev->refcount))
return;
- mutex_lock(&ida_lock);
- ida_simple_remove(&index_ida, dev->clt_device_id);
- mutex_unlock(&ida_lock);
+ ida_free(&index_ida, dev->clt_device_id);
kfree(dev->hw_queues);
kfree(dev->pathname);
rnbd_clt_put_sess(dev->sess);
@@ -1460,10 +1457,8 @@ static struct rnbd_clt_dev *init_dev(struct rnbd_clt_session *sess,
goto out_alloc;
}
- mutex_lock(&ida_lock);
- ret = ida_simple_get(&index_ida, 0, 1 << (MINORBITS - RNBD_PART_BITS),
- GFP_KERNEL);
- mutex_unlock(&ida_lock);
+ ret = ida_alloc_max(&index_ida, 1 << (MINORBITS - RNBD_PART_BITS),
+ GFP_KERNEL);
if (ret < 0) {
pr_err("Failed to initialize device '%s' from session %s, allocating idr failed, err: %d\n",
pathname, sess->sessname, ret);