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From:   Fernando Ramos <greenfoo@u92.eu>
To:     dri-devel@lists.freedesktop.org
Cc:     linux-kernel@vger.kernel.org, sean@poorly.run,
        linux-doc@vger.kernel.org, amd-gfx@lists.freedesktop.org,
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        linux-renesas-soc@vger.kernel.org, linux-tegra@vger.kernel.org
Subject: [PATCH v4 19/20] drm: cleanup: remove drm_modeset_(un)lock_all()
Date:   Wed, 13 Oct 2021 22:48:45 +0200
Message-Id: <20211013204846.90026-20-greenfoo@u92.eu>
In-Reply-To: <20211013204846.90026-1-greenfoo@u92.eu>
References: <20211013204846.90026-1-greenfoo@u92.eu>
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Functions drm_modeset_lock_all() and drm_modeset_unlock_all() are no
longer used anywhere and can be removed.

Signed-off-by: Fernando Ramos <greenfoo@u92.eu>
---
 drivers/gpu/drm/drm_modeset_lock.c | 94 +-----------------------------
 include/drm/drm_modeset_lock.h     |  2 -
 2 files changed, 3 insertions(+), 93 deletions(-)

diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index 4d32b61fa1fd..b2b84ca2b738 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -117,93 +117,6 @@ static void __stack_depot_print(depot_stack_handle_t stack_depot)
 }
 #endif /* CONFIG_DRM_DEBUG_MODESET_LOCK */
 
-/**
- * drm_modeset_lock_all - take all modeset locks
- * @dev: DRM device
- *
- * This function takes all modeset locks, suitable where a more fine-grained
- * scheme isn't (yet) implemented. Locks must be dropped by calling the
- * drm_modeset_unlock_all() function.
- *
- * This function is deprecated. It allocates a lock acquisition context and
- * stores it in &drm_device.mode_config. This facilitate conversion of
- * existing code because it removes the need to manually deal with the
- * acquisition context, but it is also brittle because the context is global
- * and care must be taken not to nest calls. New code should use the
- * drm_modeset_lock_all_ctx() function and pass in the context explicitly.
- */
-void drm_modeset_lock_all(struct drm_device *dev)
-{
-	struct drm_mode_config *config = &dev->mode_config;
-	struct drm_modeset_acquire_ctx *ctx;
-	int ret;
-
-	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL | __GFP_NOFAIL);
-	if (WARN_ON(!ctx))
-		return;
-
-	mutex_lock(&config->mutex);
-
-	drm_modeset_acquire_init(ctx, 0);
-
-retry:
-	ret = drm_modeset_lock_all_ctx(dev, ctx);
-	if (ret < 0) {
-		if (ret == -EDEADLK) {
-			drm_modeset_backoff(ctx);
-			goto retry;
-		}
-
-		drm_modeset_acquire_fini(ctx);
-		kfree(ctx);
-		return;
-	}
-	ww_acquire_done(&ctx->ww_ctx);
-
-	WARN_ON(config->acquire_ctx);
-
-	/*
-	 * We hold the locks now, so it is safe to stash the acquisition
-	 * context for drm_modeset_unlock_all().
-	 */
-	config->acquire_ctx = ctx;
-
-	drm_warn_on_modeset_not_all_locked(dev);
-}
-EXPORT_SYMBOL(drm_modeset_lock_all);
-
-/**
- * drm_modeset_unlock_all - drop all modeset locks
- * @dev: DRM device
- *
- * This function drops all modeset locks taken by a previous call to the
- * drm_modeset_lock_all() function.
- *
- * This function is deprecated. It uses the lock acquisition context stored
- * in &drm_device.mode_config. This facilitates conversion of existing
- * code because it removes the need to manually deal with the acquisition
- * context, but it is also brittle because the context is global and care must
- * be taken not to nest calls. New code should pass the acquisition context
- * directly to the drm_modeset_drop_locks() function.
- */
-void drm_modeset_unlock_all(struct drm_device *dev)
-{
-	struct drm_mode_config *config = &dev->mode_config;
-	struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
-
-	if (WARN_ON(!ctx))
-		return;
-
-	config->acquire_ctx = NULL;
-	drm_modeset_drop_locks(ctx);
-	drm_modeset_acquire_fini(ctx);
-
-	kfree(ctx);
-
-	mutex_unlock(&dev->mode_config.mutex);
-}
-EXPORT_SYMBOL(drm_modeset_unlock_all);
-
 /**
  * drm_warn_on_modeset_not_all_locked - check that all modeset locks are locked
  * @dev: device
@@ -425,10 +338,9 @@ EXPORT_SYMBOL(drm_modeset_unlock);
  * This function takes all modeset locks, suitable where a more fine-grained
  * scheme isn't (yet) implemented.
  *
- * Unlike drm_modeset_lock_all(), it doesn't take the &drm_mode_config.mutex
- * since that lock isn't required for modeset state changes. Callers which
- * need to grab that lock too need to do so outside of the acquire context
- * @ctx.
+ * It doesn't take the &drm_mode_config.mutex since that lock isn't required for
+ * modeset state changes. Callers which need to grab that lock too need to do so
+ * outside of the acquire context @ctx.
  *
  * Locks acquired with this function should be released by calling the
  * drm_modeset_drop_locks() function on @ctx.
diff --git a/include/drm/drm_modeset_lock.h b/include/drm/drm_modeset_lock.h
index b84693fbd2b5..96b853530120 100644
--- a/include/drm/drm_modeset_lock.h
+++ b/include/drm/drm_modeset_lock.h
@@ -140,8 +140,6 @@ struct drm_device;
 struct drm_crtc;
 struct drm_plane;
 
-void drm_modeset_lock_all(struct drm_device *dev);
-void drm_modeset_unlock_all(struct drm_device *dev);
 void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
 
 int drm_modeset_lock_all_ctx(struct drm_device *dev,
-- 
2.33.0