Messages in this thread Patch in this message | | | From | Bo Ye <> | Subject | [PATCH 1/2] f2fs: fix iostat lock protection | Date | Fri, 31 Mar 2023 17:26:56 +0800 |
| |
From: Qilin Tan <qilin.tan@mediatek.com>
Made iostat lock irq safe to avoid potentinal deadlock.
Deadlock scenario: f2fs_attr_store -> f2fs_sbi_store -> _sbi_store -> spin_lock(sbi->iostat_lock) <interrupt request> -> scsi_end_request -> bio_endio -> f2fs_dio_read_end_io -> f2fs_update_iostat -> spin_lock_irqsave(sbi->iostat_lock) ===> Dead lock here
Signed-off-by: Qilin Tan <qilin.tan@mediatek.com> --- fs/f2fs/sysfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 0b19163c90d4..fd238a68017e 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -575,9 +575,9 @@ static ssize_t __sbi_store(struct f2fs_attr *a, if (!strcmp(a->attr.name, "iostat_period_ms")) { if (t < MIN_IOSTAT_PERIOD_MS || t > MAX_IOSTAT_PERIOD_MS) return -EINVAL; - spin_lock(&sbi->iostat_lock); + spin_lock_irq(&sbi->iostat_lock); sbi->iostat_period_ms = (unsigned int)t; - spin_unlock(&sbi->iostat_lock); + spin_unlock_irq(&sbi->iostat_lock); return count; } #endif -- 2.17.0
| |