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Subject[PATCH staging-next] zram: protect zram_reset_device() call
Commit 9b3bb7abcdf2df0f1b2657e6cbc9d06bc2b3b36f (remove
zram_sysfs file (v2)) accidentally made zram_reset_device()
racy. Protect zram_reset_device() call with zram->lock.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

---
drivers/staging/zram/zram_drv.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 82c7202..e77fb6e 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -527,8 +527,11 @@ static void zram_reset_device(struct zram *zram)
size_t index;
struct zram_meta *meta;

- if (!zram->init_done)
+ down_write(&zram->init_lock);
+ if (!zram->init_done) {
+ up_write(&zram->init_lock);
return;
+ }

meta = zram->meta;
zram->init_done = 0;
@@ -549,6 +552,7 @@ static void zram_reset_device(struct zram *zram)

zram->disksize = 0;
set_capacity(zram->disk, 0);
+ up_write(&zram->init_lock);
}

static void zram_init_device(struct zram *zram, struct zram_meta *meta)


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