linux-kernel - [PATCH 3.2 71/92] i2c: s3c2410: resume race fix

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Date:	Sat, 07 Jun 2014 02:26:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Olof Johansson" <olof@...om.net>,
	"Wolfram Sang" <wsa@...-dreams.de>,
	"Kukjin Kim" <kgene.kim@...sung.com>,
	"Doug Anderson" <dianders@...omium.org>
Subject: [PATCH 3.2 71/92] i2c: s3c2410: resume race fix

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Olof Johansson <olof@...om.net>

commit ce78cc071f5f541480e381cc0241d37590041a9d upstream.

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@...om.net>
Signed-off-by: Doug Anderson <dianders@...omium.org>
Acked-by: Kukjin Kim <kgene.kim@...sung.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/i2c/busses/i2c-s3c2410.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1082,10 +1082,10 @@ static int s3c24xx_i2c_resume(struct dev
 	struct platform_device *pdev = to_platform_device(dev);
 	struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
 
-	i2c->suspended = 0;
 	clk_enable(i2c->clk);
 	s3c24xx_i2c_init(i2c);
 	clk_disable(i2c->clk);
+	i2c->suspended = 0;
 
 	return 0;
 }

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