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drm/i915: Don't oops in dumb_create ioctl if we have no crtcs
Make sure we have a crtc before probing its primary plane's max stride. Initially I thought we can't get this far without crtcs, but looks like we can via the dumb_create ioctl. Not sure if we shouldn't disable dumb buffer support entirely when we have no crtcs, but that would require some amount of work as the only thing currently being checked is dev->driver->dumb_create which we'd have to convert to some device specific dynamic thing. Cc: stable@vger.kernel.org Reported-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Fixes:aa5ca8b742
("drm/i915: Align dumb buffer stride to 4k to allow for gtt remapping") Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191106172349.11987-1-ville.syrjala@linux.intel.com Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (cherry picked from commitbaea9ffe64
) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
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@ -2529,6 +2529,9 @@ u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv,
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* the highest stride limits of them all.
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*/
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crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_A);
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if (!crtc)
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return 0;
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plane = to_intel_plane(crtc->base.primary);
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return plane->max_stride(plane, pixel_format, modifier,
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