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staging: zram: protect zram_reset_device() call

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Commit 9b3bb7abcd (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>
Acked-by: Jerome Marchand <jmarchand@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 644d478793)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
This commit is contained in:
Sergey Senozhatsky
2013-06-26 15:28:39 +03:00
committed by Alex Shi
parent c5544682ef
commit 687f091b39
1 changed files with 5 additions and 1 deletions
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6
drivers/staging/zram/zram_drv.c
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@@ -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)