From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nitin Gupta <ngupta@vflare.org>, linux-kernel@vger.kernel.org
Subject: [PATCH staging-next] zram: protect zram_reset_device() call
Date: Wed, 26 Jun 2013 15:28:39 +0300 [thread overview]
Message-ID: <20130626122839.GA2268@swordfish.minsk.epam.com> (raw)
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)
next reply other threads:[~2013-06-26 12:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-26 12:28 Sergey Senozhatsky [this message]
2013-07-03 9:37 ` Jerome Marchand
2013-07-12 13:46 ` Sergey Senozhatsky
2013-07-12 14:48 ` Greg Kroah-Hartman
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