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| author | Christophe JAILLET <christophe.jaillet@wanadoo.fr> | 2022-02-07 21:48:19 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-02-27 14:49:49 -0700 |
| commit | 24afc15dbe218f860994f627b4ba1fb09225a298 (patch) | |
| tree | e70955fd091cd9b60af0c4a366c760795f48bd00 /drivers/block | |
| parent | 030ce8ba97d2e85e5310b1ae8236cd640bd384d0 (diff) | |
| download | lwn-24afc15dbe218f860994f627b4ba1fb09225a298.tar.gz lwn-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>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/rnbd/rnbd-clt.c | 11 |
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); |