From 0fe37724f8e70fa4cb72948f60fca553702df768 Mon Sep 17 00:00:00 2001
From: Damien Le Moal <damien.lemoal@wdc.com>
Date: Thu, 28 Jan 2021 15:36:19 +0900
Subject: [PATCH] block: fix bd_size_lock use
Some block device drivers, e.g. the skd driver, call set_capacity() with
IRQ disabled. This results in lockdep ito complain about inconsistent
lock states ("inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage")
because set_capacity takes a block device bd_size_lock using the
functions spin_lock() and spin_unlock(). Ensure a consistent locking
state by replacing these calls with spin_lock_irqsave() and
spin_lock_irqrestore(). The same applies to bdev_set_nr_sectors().
With this fix, all lockdep complaints are resolved.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/genhd.c | 5 +++--
block/partitions/core.c | 6 ++++--
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index 419548e92d82f..9e741a4f351be 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -45,10 +45,11 @@ 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(&bdev->bd_size_lock);
+ spin_lock_irqsave(&bdev->bd_size_lock, flags);
i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
- spin_unlock(&bdev->bd_size_lock);
+ spin_unlock_irqrestore(&bdev->bd_size_lock, flags);
}
EXPORT_SYMBOL(set_capacity);
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 23460cee9de50..4601a845cd79e 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -88,9 +88,11 @@ static int (*check_part[])(struct parsed_partitions *) = {
static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors)
{
- spin_lock(&bdev->bd_size_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&bdev->bd_size_lock, flags);
i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
- spin_unlock(&bdev->bd_size_lock);
+ spin_unlock_irqrestore(&bdev->bd_size_lock, flags);
}
static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
--
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