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| author |   Marek Szyprowski <m.szyprowski@samsung.com> | 2017-09-14 14:01:00 +0200 |
|---|---|---|
| committer |   Inki Dae <inki.dae@samsung.com> | 2017-09-19 19:50:43 +0900 |
| commit | 5baf6bb0fd2388742a0846cc7bcacee6dec78235 (patch) | |
| tree | 7726d25f1d280daa83b28de77acfbd225f08cccd /drivers/gpu/drm/exynos | |
| parent | Merge tag 'drm-amdkfd-next-2017-09-02' of git://people.freedesktop.org/~gabbayo/linux into drm-fixes (diff) | |
| download | linux-dev-5baf6bb0fd2388742a0846cc7bcacee6dec78235.tar.xz linux-dev-5baf6bb0fd2388742a0846cc7bcacee6dec78235.zip | |
drm/exynos: Fix locking in the suspend/resume paths
Commit 48a92916729b ("drm/exynos: use drm_for_each_connector_iter()")
replaced unsafe drm_for_each_connector() with drm_for_each_connector_iter()
and removed surrounding drm_modeset_lock calls. However, that lock was
there not only to protect unsafe drm_for_each_connector(), but it was also
required to be held by the dpms code which was called from the loop body.
This patch restores those drm_modeset_lock calls to fix broken suspend
and resume of Exynos DRM subsystem in v4.13 kernel.
Fixes: 48a92916729b ("drm/exynos: use drm_for_each_connector_iter()")
CC: stable@vger.kernel.org # v4.13
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Diffstat (limited to 'drivers/gpu/drm/exynos')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_drv.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index b1f7299600f0..7f3cfc5dd320 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -174,6 +174,7 @@ static int exynos_drm_suspend(struct device *dev) if (pm_runtime_suspended(dev) || !drm_dev) return 0; + drm_modeset_lock_all(drm_dev); drm_connector_list_iter_begin(drm_dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { int old_dpms = connector->dpms; @@ -185,6 +186,7 @@ static int exynos_drm_suspend(struct device *dev) connector->dpms = old_dpms; } drm_connector_list_iter_end(&conn_iter); + drm_modeset_unlock_all(drm_dev); return 0; } @@ -198,6 +200,7 @@ static int exynos_drm_resume(struct device *dev) if (pm_runtime_suspended(dev) || !drm_dev) return 0; + drm_modeset_lock_all(drm_dev); drm_connector_list_iter_begin(drm_dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { if (connector->funcs->dpms) { @@ -208,6 +211,7 @@ static int exynos_drm_resume(struct device *dev) } } drm_connector_list_iter_end(&conn_iter); + drm_modeset_unlock_all(drm_dev); return 0; } |