From: Christoph Hellwig <hch@lst.de>
To: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>
Cc: Guenter Roeck <linux@roeck-us.net>, linux-mtd@lists.infradead.org
Subject: [PATCH 8/8] mtd_blkdevs: simplify the refcounting in blktrans_{open, release}
Date: Mon, 23 Aug 2021 09:33:59 +0200 [thread overview]
Message-ID: <20210823073359.705281-9-hch@lst.de> (raw)
In-Reply-To: <20210823073359.705281-1-hch@lst.de>
Always grab a reference to the mtd_blktrans_dev in ->open instead of
just on the first open, and do away with the additional temporary
references in ->open and ->release.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/mtd/mtd_blkdevs.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 012c0966010a..b8ae1ec14e17 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -36,14 +36,6 @@ static void blktrans_dev_release(struct kref *kref)
kfree(dev);
}
-static struct mtd_blktrans_dev *blktrans_dev_get(struct gendisk *disk)
-{
- struct mtd_blktrans_dev *dev = disk->private_data;
-
- kref_get(&dev->ref);
- return dev;
-}
-
static void blktrans_dev_put(struct mtd_blktrans_dev *dev)
{
kref_put(&dev->ref, blktrans_dev_release);
@@ -191,15 +183,16 @@ static blk_status_t mtd_queue_rq(struct blk_mq_hw_ctx *hctx,
static int blktrans_open(struct block_device *bdev, fmode_t mode)
{
- struct mtd_blktrans_dev *dev = blktrans_dev_get(bdev->bd_disk);
+ struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
int ret = 0;
+ kref_get(&dev->ref);
+
mutex_lock(&dev->lock);
if (dev->open)
goto unlock;
- kref_get(&dev->ref);
__module_get(dev->tr->owner);
if (!dev->mtd)
@@ -219,7 +212,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
unlock:
dev->open++;
mutex_unlock(&dev->lock);
- blktrans_dev_put(dev);
return ret;
error_release:
@@ -227,7 +219,6 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
dev->tr->release(dev);
error_put:
module_put(dev->tr->owner);
- kref_put(&dev->ref, blktrans_dev_release);
mutex_unlock(&dev->lock);
blktrans_dev_put(dev);
return ret;
@@ -235,14 +226,13 @@ static int blktrans_open(struct block_device *bdev, fmode_t mode)
static void blktrans_release(struct gendisk *disk, fmode_t mode)
{
- struct mtd_blktrans_dev *dev = blktrans_dev_get(disk);
+ struct mtd_blktrans_dev *dev = disk->private_data;
mutex_lock(&dev->lock);
if (--dev->open)
goto unlock;
- kref_put(&dev->ref, blktrans_dev_release);
module_put(dev->tr->owner);
if (dev->mtd) {
--
2.30.2
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http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2021-08-23 7:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-23 7:33 mtd locking fix and cleanups Christoph Hellwig
2021-08-23 7:33 ` [PATCH 1/8] mtd_blkdevs: don't hold del_mtd_blktrans_dev in blktrans_{open, release} Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` [PATCH 2/8] mtd_blkdevs: use lockdep_assert_held Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` [PATCH 3/8] mtd/ftl: don't cast away the type when calling add_mtd_blktrans_dev Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` [PATCH 4/8] mtd/rfd_ftl: " Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` [PATCH 5/8] mtd_blkdevs: simplify blktrans_dev_get Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` [PATCH 6/8] mtd_blkdevs: remove blktrans_ref_mutex Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` [PATCH 7/8] mtd_blkdevs: simplify blktrans_getgeo Christoph Hellwig
2021-08-23 8:33 ` Miquel Raynal
2021-08-23 7:33 ` Christoph Hellwig [this message]
2021-08-23 8:33 ` [PATCH 8/8] mtd_blkdevs: simplify the refcounting in blktrans_{open, release} Miquel Raynal
2021-08-23 8:30 ` mtd locking fix and cleanups Miquel Raynal
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