diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-04-03 18:15:28 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-14 09:44:13 +0200 |
| commit | adb9bbf1a28499c6df7c58c09c6f68d8d355d5e5 (patch) | |
| tree | e5ee86ca69ff8d7c84819f270c308c129a01bdc5 /drivers/md | |
| parent | afa4de0926635d07a0431a27e5c2f504b9c1490d (diff) | |
md: factor out a mddev_find_locked helper from mddev_find
commit 8b57251f9a91f5e5a599de7549915d2d226cc3af upstream.
Factor out a self-contained helper to just lookup a mddev by the dev_t
"unit".
Cc: stable@vger.kernel.org
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 65a9d0355a03..9abdefd623e4 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -647,6 +647,17 @@ void mddev_init(struct mddev *mddev) } EXPORT_SYMBOL_GPL(mddev_init); +static struct mddev *mddev_find_locked(dev_t unit) +{ + struct mddev *mddev; + + list_for_each_entry(mddev, &all_mddevs, all_mddevs) + if (mddev->unit == unit) + return mddev; + + return NULL; +} + static struct mddev *mddev_find(dev_t unit) { struct mddev *mddev; @@ -674,13 +685,13 @@ static struct mddev *mddev_find_or_alloc(dev_t unit) spin_lock(&all_mddevs_lock); if (unit) { - list_for_each_entry(mddev, &all_mddevs, all_mddevs) - if (mddev->unit == unit) { - mddev_get(mddev); - spin_unlock(&all_mddevs_lock); - kfree(new); - return mddev; - } + mddev = mddev_find_locked(unit); + if (mddev) { + mddev_get(mddev); + spin_unlock(&all_mddevs_lock); + kfree(new); + return mddev; + } if (new) { list_add(&new->all_mddevs, &all_mddevs); @@ -706,12 +717,7 @@ static struct mddev *mddev_find_or_alloc(dev_t unit) return NULL; } - is_free = 1; - list_for_each_entry(mddev, &all_mddevs, all_mddevs) - if (mddev->unit == dev) { - is_free = 0; - break; - } + is_free = !mddev_find_locked(dev); } new->unit = dev; new->md_minor = MINOR(dev); |