On Wed, Jan 21, 2015 at 01:50:54PM +0000, Damien Lespiau wrote:
> Smatch doesn't like:
>
> struct drm_framebuffer *fb;
> fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
>
> and warns with:
>
> warn: struct type mismatch 'drm_framebuffer vs intel_framebuffer'
>
> This implicit cast was correct as struct intel_framebuffer has struct
> drm_framebuffer as its first member, but in case someone want to reorder
> the fields for some reason, it's slightly safer to access the underlying
> drm_framebuffer through intel_fb->base.
>
> Also, having fewer static analysis warnings is a worthy goal.
>
> Cc: kbuild@xxxxxx
> Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 21 +++++++++++++++------
> 1 file changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 65fce56..01dc80b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6584,13 +6584,16 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
> int fourcc, pixel_format;
> int aligned_height;
> struct drm_framebuffer *fb;
> + struct intel_framebuffer *intel_fb;
>
> - fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
> - if (!fb) {
> + intel_fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
sizeof(*intel_fb) while at it?
> + if (!intel_fb) {
> DRM_DEBUG_KMS("failed to alloc fb\n");
> return;
> }
>
> + fb = &intel_fb->base;
> +
> val = I915_READ(DSPCNTR(plane));
>
> if (INTEL_INFO(dev)->gen >= 4)
> @@ -7613,13 +7616,16 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc,
> int fourcc, pixel_format;
> int aligned_height;
> struct drm_framebuffer *fb;
> + struct intel_framebuffer *intel_fb;
>
> - fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
> - if (!fb) {
> + intel_fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
> + if (!intel_fb) {
> DRM_DEBUG_KMS("failed to alloc fb\n");
> return;
> }
>
> + fb = &intel_fb->base;
> +
> val = I915_READ(PLANE_CTL(pipe, 0));
> if (val & PLANE_CTL_TILED_MASK)
> plane_config->tiling = I915_TILING_X;
> @@ -7706,13 +7712,16 @@ ironlake_get_initial_plane_config(struct intel_crtc *crtc,
> int fourcc, pixel_format;
> int aligned_height;
> struct drm_framebuffer *fb;
> + struct intel_framebuffer *intel_fb;
>
> - fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
> - if (!fb) {
> + intel_fb = kzalloc(sizeof(struct intel_framebuffer), GFP_KERNEL);
> + if (!intel_fb) {
> DRM_DEBUG_KMS("failed to alloc fb\n");
> return;
> }
>
> + fb = &intel_fb->base;
> +
> val = I915_READ(DSPCNTR(pipe));
>
> if (INTEL_INFO(dev)->gen >= 4)
> --
> 1.8.3.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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