On Mon, 2014-12-15 at 14:24 +0000, Luis Henriques wrote: > 3.16.7-ckt3 -stable review patch. If anyone has any objections, please let > me know. > > ------------------ > > From: Chris Wilson <ch...@chris-wilson.co.uk> > > commit f96de58fc7e7d3d717c7c63975c3b896c906b5e3 upstream. > > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> > Reviewed-by: Jani Nikula <jani.nik...@intel.com> > Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> > Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
Should this also be applied to any older stable branches?
i915_kick_out_firmware_fb() was introduced in 3.6 and it has always been
possible for the alloc_apertures() call to fail.
remove_conflicting_framebuffers() has returned an error code since 3.14
(but could silently fail before then!) so this should be applicable to
the 3.14 stable branch too.
Ben.
> ---
> drivers/gpu/drm/i915/i915_dma.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index d44344140627..0663fb4fa606 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1425,15 +1425,16 @@ void i915_master_destroy(struct drm_device *dev,
> struct drm_master *master)
> }
>
> #if IS_ENABLED(CONFIG_FB)
> -static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
> +static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
> {
> struct apertures_struct *ap;
> struct pci_dev *pdev = dev_priv->dev->pdev;
> bool primary;
> + int ret;
>
> ap = alloc_apertures(1);
> if (!ap)
> - return;
> + return -ENOMEM;
>
> ap->ranges[0].base = dev_priv->gtt.mappable_base;
> ap->ranges[0].size = dev_priv->gtt.mappable_end;
> @@ -1441,13 +1442,16 @@ static void i915_kick_out_firmware_fb(struct
> drm_i915_private *dev_priv)
> primary =
> pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
>
> - remove_conflicting_framebuffers(ap, "inteldrmfb", primary);
> + ret = remove_conflicting_framebuffers(ap, "inteldrmfb", primary);
>
> kfree(ap);
> +
> + return ret;
> }
> #else
> -static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
> +static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
> {
> + return 0;
> }
> #endif
>
> @@ -1664,7 +1668,11 @@ int i915_driver_load(struct drm_device *dev, unsigned
> long flags)
> goto out_gtt;
> }
>
> - i915_kick_out_firmware_fb(dev_priv);
> + ret = i915_kick_out_firmware_fb(dev_priv);
> + if (ret) {
> + DRM_ERROR("failed to remove conflicting framebuffer
> drivers\n");
> + goto out_gtt;
> + }
> }
>
> pci_set_master(dev->pdev);
--
Ben Hutchings
One of the nice things about standards is that there are so many of them.
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