011f2c26f1
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
76 lines
2.6 KiB
Diff
76 lines
2.6 KiB
Diff
From 180aed47cc2cc41b8669e9e6c61f79bf1b018fed Mon Sep 17 00:00:00 2001
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From: Daniel Vetter <daniel.vetter@ffwll.ch>
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Date: Mon, 30 May 2016 19:53:06 +0200
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Subject: [PATCH] drm/vc4: Use drm_gem_object_unreference_unlocked
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Since my last struct_mutex crusade someone escaped!
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This already has the advantage that for the common case when someone
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else holds a ref the unref won't even acquire dev->struct_mutex. And
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I'm working on code to allow drivers to completely opt-out of any and
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all dev->struct_mutex usage, but that only works if they use the
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_unlocked variants everywhere.
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v2: Drop comment too.
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v3: Drop the other comment too.
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Cc: Eric Anholt <eric@anholt.net>
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Reviewed-by: Eric Anholt <eric@anholt.net>
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Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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Link: http://patchwork.freedesktop.org/patch/msgid/1464630800-30786-15-git-send-email-daniel.vetter@ffwll.ch
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(cherry picked from commit db3697295cf4da1356e3ec86761d464d6d013b48)
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---
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drivers/gpu/drm/vc4/vc4_bo.c | 2 --
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drivers/gpu/drm/vc4/vc4_gem.c | 11 +++--------
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2 files changed, 3 insertions(+), 10 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_bo.c
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+++ b/drivers/gpu/drm/vc4/vc4_bo.c
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@@ -311,8 +311,6 @@ static void vc4_bo_cache_free_old(struct
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/* Called on the last userspace/kernel unreference of the BO. Returns
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* it to the BO cache if possible, otherwise frees it.
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- *
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- * Note that this is called with the struct_mutex held.
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*/
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void vc4_free_object(struct drm_gem_object *gem_bo)
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{
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--- a/drivers/gpu/drm/vc4/vc4_gem.c
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+++ b/drivers/gpu/drm/vc4/vc4_gem.c
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@@ -67,10 +67,8 @@ vc4_free_hang_state(struct drm_device *d
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{
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unsigned int i;
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- mutex_lock(&dev->struct_mutex);
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for (i = 0; i < state->user_state.bo_count; i++)
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- drm_gem_object_unreference(state->bo[i]);
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- mutex_unlock(&dev->struct_mutex);
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+ drm_gem_object_unreference_unlocked(state->bo[i]);
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kfree(state);
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}
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@@ -711,11 +709,9 @@ vc4_complete_exec(struct drm_device *dev
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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unsigned i;
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- /* Need the struct lock for drm_gem_object_unreference(). */
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- mutex_lock(&dev->struct_mutex);
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if (exec->bo) {
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for (i = 0; i < exec->bo_count; i++)
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- drm_gem_object_unreference(&exec->bo[i]->base);
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+ drm_gem_object_unreference_unlocked(&exec->bo[i]->base);
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kfree(exec->bo);
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}
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@@ -723,9 +719,8 @@ vc4_complete_exec(struct drm_device *dev
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struct vc4_bo *bo = list_first_entry(&exec->unref_list,
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struct vc4_bo, unref_head);
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list_del(&bo->unref_head);
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- drm_gem_object_unreference(&bo->base.base);
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+ drm_gem_object_unreference_unlocked(&bo->base.base);
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}
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- mutex_unlock(&dev->struct_mutex);
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mutex_lock(&vc4->power_lock);
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if (--vc4->power_refcount == 0) {
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