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drm/radeon/kms/agp The wrong AGP chipset can cause a NULL pointer dereference

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Selecting the wrong or no CONFIG_AGP_* chipset can cause a NULL pointer
dereference when combined with CONFIG_DRM_RADEON_KMS and an old system
with a R100 AGP card (should effect other cards too).  The agp field
will be set to NULL if no suitable AGP chipset driver is loaded,
drm_agp_acquire already preforms a suitable NULL check so it can be used
directly.

Signed-off-by: Robert Fitzsimons <robfitz@273k.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Robert Fitzsimons 2010-04-24 01:18:13 +01:00 committed by Dave Airlie
parent 797fd5b9da
commit ccb2ad579f
1 changed files with 4 additions and 6 deletions
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10
drivers/gpu/drm/radeon/radeon_agp.c
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@ -134,12 +134,10 @@ int radeon_agp_init(struct radeon_device *rdev)
int ret;
/* Acquire AGP. */
if (!rdev->ddev->agp->acquired) {
ret = drm_agp_acquire(rdev->ddev);
if (ret) {
DRM_ERROR("Unable to acquire AGP: %d\n", ret);
return ret;
}
ret = drm_agp_acquire(rdev->ddev);
if (ret) {
DRM_ERROR("Unable to acquire AGP: %d\n", ret);
return ret;
}
ret = drm_agp_info(rdev->ddev, &info);