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SubjectRe: [PATCH v2] drm/i915/display: replace boilerplate code with helper macros
On Sat, Jun 26, 2021 at 03:32:27AM -0400, Hamza Mahfooz wrote:
> As per commit 22be87401289 ("drm: TODO: Add DRM_MODESET_LOCK_ALL*
> conversion to todo.rst"),
> drm_modeset_lock_all()/drm_modeset_unlock_all() and boilerplate code
> surrounding instances of drm_modeset_lock_all_ctx() with a local acquire
> context should be replaced with the relevant helper macros.
>
> Signed-off-by: Hamza Mahfooz <someguy@effective-light.com>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 20 +++++++-------------
> 1 file changed, 7 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 64e9107d70f7..e8cb2881d2b4 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -40,6 +40,7 @@
> #include <drm/drm_dp_helper.h>
> #include <drm/drm_edid.h>
> #include <drm/drm_fourcc.h>
> +#include "drm/drm_modeset_lock.h"
> #include <drm/drm_plane_helper.h>
> #include <drm/drm_probe_helper.h>
> #include <drm/drm_rect.h>
> @@ -11836,6 +11837,7 @@ int intel_modeset_init_nogem(struct drm_i915_private *i915)
> struct drm_device *dev = &i915->drm;
> enum pipe pipe;
> struct intel_crtc *crtc;
> + struct drm_modeset_acquire_ctx ctx;
> int ret;
>
> intel_init_pm(i915);
> @@ -11884,9 +11886,9 @@ int intel_modeset_init_nogem(struct drm_i915_private *i915)
> intel_vga_disable(i915);
> intel_setup_outputs(i915);
>
> - drm_modeset_lock_all(dev);
> + DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
> intel_modeset_setup_hw_state(dev, dev->mode_config.acquire_ctx);
> - drm_modeset_unlock_all(dev);
> + DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);

That looks wrong. You're using a private ctx here, but still
passing dev->mode_config.acquire_ctx to the lower level stuff.

Also DRM_MODESET_LOCK_ALL_{BEGIN,END}() do not seem to be
equivalent to drm_modeset_{lock,unlock}_all() when it comes to
mode_config.mutex. So would need a proper review whether we
actually need that lock or not.

--
Ville Syrjälä
Intel

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