linux-kernel - [PATCH 3.2 08/62] drm/i915: fix error path in intel_setup

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Message-ID: <lsq.1459279102.341996313@decadent.org.uk>
Date:	Tue, 29 Mar 2016 20:18:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Rasmus Villemoes" <linux@...musvillemoes.dk>,
	"Jani Nikula" <jani.nikula@...el.com>
Subject: [PATCH 3.2 08/62] drm/i915: fix error path in intel_setup_gmbus()

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

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

From: Rasmus Villemoes <linux@...musvillemoes.dk>

commit ed3f9fd1e865975ceefdb2a43b453e090b1fd787 upstream.

This fails to undo the setup for pin==0; moreover, something
interesting happens if the setup failed already at pin==0.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Fixes: f899fc64cda8 ("drm/i915: use GMBUS to manage i2c links")
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455048677-19882-3-git-send-email-linux@rasmusvillemoes.dk
(cherry picked from commit 2417c8c03f508841b85bf61acc91836b7b0e2560)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
[bwh: Backported to 3.2: index variable is i, not pin]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/i915/intel_i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -410,7 +410,7 @@ int intel_setup_gmbus(struct drm_device
 	return 0;
 
 err:
-	while (--i) {
+	while (i--) {
 		struct intel_gmbus *bus = &dev_priv->gmbus[i];
 		i2c_del_adapter(&bus->adapter);
 	}