i2c: s3c2410: resume race fix
authorOlof Johansson <olof@lixom.net>
Fri, 11 Apr 2014 22:19:41 +0000 (15:19 -0700)
committerWolfram Sang <wsa@the-dreams.de>
Wed, 14 May 2014 16:14:43 +0000 (18:14 +0200)
Don't unmark the device as suspended until after it's been re-setup.

The main race would be w.r.t. an i2c driver that gets resumed at the same
time (asyncronously), that is allowed to do a transfer since suspended
is set to 0 before reinit, but really should have seen the -EIO return
instead.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
drivers/i2c/busses/i2c-s3c2410.c

index ae44910..bb3a996 100644 (file)
@@ -1276,10 +1276,10 @@ static int s3c24xx_i2c_resume(struct device *dev)
        struct platform_device *pdev = to_platform_device(dev);
        struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
 
-       i2c->suspended = 0;
        clk_prepare_enable(i2c->clk);
        s3c24xx_i2c_init(i2c);
        clk_disable_unprepare(i2c->clk);
+       i2c->suspended = 0;
 
        return 0;
 }