linux-kernel - [PATCH 1/1 v2] DRM: fix radeon suspend/resume oops

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Date:	Sun,  9 Nov 2008 23:01:27 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	akpm@...ux-foundation.org
Cc:	dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>,
	David Airlie <airlied@...ux.ie>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [PATCH 1/1 v2] DRM: fix radeon suspend/resume oops

me wrote:
> As the accesses to the mmio member are not protected by anything, they
> seem to be racy with the open/clsoe anyways, setting this down there
> too.

On the second though it should be protected. Updated patch below...

+ added Rafael to cc list

--

When the driver is bound to a device and nobody opens the device node,
it will oops on suspend and resume, since it's not mapped and
dev_priv->mmio is NULL.

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/gpu/drm/radeon/radeon_drv.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 71af746..7672310 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -56,6 +56,9 @@ static int radeon_suspend(struct drm_device *dev, pm_message_t state)
 {
 	drm_radeon_private_t *dev_priv = dev->dev_private;
 
+	if (!dev_priv->mmio)
+		return 0;
+
 	/* Disable *all* interrupts */
 	if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690)
 		RADEON_WRITE(R500_DxMODE_INT_MASK, 0);
@@ -67,6 +70,9 @@ static int radeon_resume(struct drm_device *dev)
 {
 	drm_radeon_private_t *dev_priv = dev->dev_private;
 
+	if (!dev_priv->mmio)
+		return 0;
+
 	/* Restore interrupt registers */
 	if ((dev_priv->flags & RADEON_FAMILY_MASK) >= CHIP_RS690)
 		RADEON_WRITE(R500_DxMODE_INT_MASK, dev_priv->r500_disp_irq_reg);
-- 
1.6.0.3

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