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gma500: fix an incorrect NULL check on list iterator

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commit bdef417d84 upstream.

The bug is here:
	return crtc;

The list iterator value 'crtc' will *always* be set and non-NULL by
list_for_each_entry(), so it is incorrect to assume that the iterator
value will be NULL if the list is empty or no element is found.

To fix the bug, return 'crtc' when found, otherwise return NULL.

Cc: stable@vger.kernel.org
fixes: 89c78134cc ("gma500: Add Poulsbo support")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220327052028.2013-1-xiam0nd.tong@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiaomeng Tong 2022-03-27 13:20:28 +08:00 committed by Greg Kroah-Hartman
parent 8420201df3
commit 380e0d2bf5
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/gma500/psb_intel_display.c
View file

@ -535,14 +535,15 @@ void psb_intel_crtc_init(struct drm_device *dev, int pipe,
struct drm_crtc *psb_intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
{
struct drm_crtc *crtc = NULL;
struct drm_crtc *crtc;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
if (gma_crtc->pipe == pipe)
break;
return crtc;
}
return crtc;
return NULL;
}
int gma_connector_clones(struct drm_device *dev, int type_mask)