staging: 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.
Change-Id: I93ce19f9b262584f4ef805dce5ed4de9b3968a30
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>
Git-commit: 644d478793c6594277f8ae76954da4ace7ac6f96
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
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 @@
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 @@
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)