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| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-12-02 01:52:20 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-12-18 11:04:40 +1000 |
| commit | c0c72a85c6c656218a894d4d64485f7bb54820f8 (patch) | |
| tree | 4e2d93992ad00ff9220977d6d0e990896702b40f | |
| parent | 66ee52e284a6cb387a7b28e29e8282da253efc97 (diff) | |
| download | linux-stable-c0c72a85c6c656218a894d4d64485f7bb54820f8.tar.gz linux-stable-c0c72a85c6c656218a894d4d64485f7bb54820f8.tar.bz2 linux-stable-c0c72a85c6c656218a894d4d64485f7bb54820f8.zip | |
drm: shmob_drm: Check clk_prepare_enable() return value
The clk_prepare_enable() call can fail. Check it's return value. We
can't propagate it all the way to the user as the KMS operations in
which the clock is enabled return a void.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
| -rw-r--r-- | drivers/gpu/drm/shmobile/shmob_drm_crtc.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c index 562f9a401cf6..0428076f1ce8 100644 --- a/drivers/gpu/drm/shmobile/shmob_drm_crtc.c +++ b/drivers/gpu/drm/shmobile/shmob_drm_crtc.c @@ -37,14 +37,21 @@ * Clock management */ -static void shmob_drm_clk_on(struct shmob_drm_device *sdev) +static int shmob_drm_clk_on(struct shmob_drm_device *sdev) { - if (sdev->clock) - clk_prepare_enable(sdev->clock); + int ret; + + if (sdev->clock) { + ret = clk_prepare_enable(sdev->clock); + if (ret < 0) + return ret; + } #if 0 if (sdev->meram_dev && sdev->meram_dev->pdev) pm_runtime_get_sync(&sdev->meram_dev->pdev->dev); #endif + + return 0; } static void shmob_drm_clk_off(struct shmob_drm_device *sdev) @@ -161,6 +168,7 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc) struct drm_device *dev = sdev->ddev; struct drm_plane *plane; u32 value; + int ret; if (scrtc->started) return; @@ -170,7 +178,9 @@ static void shmob_drm_crtc_start(struct shmob_drm_crtc *scrtc) return; /* Enable clocks before accessing the hardware. */ - shmob_drm_clk_on(sdev); + ret = shmob_drm_clk_on(sdev); + if (ret < 0) + return; /* Reset and enable the LCDC. */ lcdc_write(sdev, LDCNT2R, lcdc_read(sdev, LDCNT2R) | LDCNT2R_BR); |