[RFC PATCH 2/2] block: revert "block: fix bd_size_lock use"

From: Damien Le Moal <damien.lemoal@wdc.com>
To: linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>
Subject: [RFC PATCH 2/2] block: revert "block: fix bd_size_lock use"
Date: Thu,  4 Feb 2021 17:43:43 +0900	[thread overview]
Message-ID: <20210204084343.207847-3-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20210204084343.207847-1-damien.lemoal@wdc.com>

With the removal of the skd driver, using IRQ safe locking of a bdev
bd_size_lock spinlock to protect the bdev inode size is not necessary
anymore as there is no other known driver using this lock under an IRQ
disabled context (e.g. calling set_capacity() with IRQ disabled).
Revert commit 0fe37724f8e7 ("block: fix bd_size_lock use") which
introduced the IRQ safe change.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 block/genhd.c           | 5 ++---
 block/partitions/core.c | 6 ++----
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9e741a4f351b..419548e92d82 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -45,11 +45,10 @@ static void disk_release_events(struct gendisk *disk);
 void set_capacity(struct gendisk *disk, sector_t sectors)
 {
 	struct block_device *bdev = disk->part0;
-	unsigned long flags;
 
-	spin_lock_irqsave(&bdev->bd_size_lock, flags);
+	spin_lock(&bdev->bd_size_lock);
 	i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
-	spin_unlock_irqrestore(&bdev->bd_size_lock, flags);
+	spin_unlock(&bdev->bd_size_lock);
 }
 EXPORT_SYMBOL(set_capacity);
 
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 081f1df9d10d..d0745555ba16 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -88,11 +88,9 @@ static int (*check_part[])(struct parsed_partitions *) = {
 
 static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&bdev->bd_size_lock, flags);
+	spin_lock(&bdev->bd_size_lock);
 	i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
-	spin_unlock_irqrestore(&bdev->bd_size_lock, flags);
+	spin_unlock(&bdev->bd_size_lock);
 }
 
 static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
-- 
2.29.2

