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gpu/drm, x86, PAT: Handle io_mapping_create_wc() errors in a clean way

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io_mapping_create_wc can return NULL on error and io_mapping_free() should be
called on one of the error-cleanup path.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Venkatesh Pallipadi 2009-02-24 17:35:11 -08:00 committed by Ingo Molnar
parent ddf9499b3d
commit 6644107d57
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/i915_dma.c
View file

@ -1090,6 +1090,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
dev_priv->mm.gtt_mapping =
io_mapping_create_wc(dev->agp->base,
dev->agp->agp_info.aper_size * 1024*1024);
if (dev_priv->mm.gtt_mapping == NULL) {
ret = -EIO;
goto out_rmmap;
}
/* Set up a WC MTRR for non-PAT systems. This is more common than
* one would think, because the kernel disables PAT on first
* generation Core chips because WC PAT gets overridden by a UC
@ -1122,7 +1127,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
if (!I915_NEED_GFX_HWS(dev)) {
ret = i915_init_phys_hws(dev);
if (ret != 0)
goto out_rmmap;
goto out_iomapfree;
}
/* On the 945G/GM, the chipset reports the MSI capability on the
@ -1161,6 +1166,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
return 0;
out_iomapfree:
io_mapping_free(dev_priv->mm.gtt_mapping);
out_rmmap:
iounmap(dev_priv->regs);
free_priv: