linux-kernel - [PATCH v4 01/15] drm/msm: Reorder lock vs submit alloc

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Date:   Tue,  2 Aug 2022 08:51:34 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 01/15] drm/msm: Reorder lock vs submit alloc

From: Rob Clark <robdclark@...omium.org>

This lets us drop the NORETRY.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/msm_gem_submit.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index c9e4aeb14f4a..b7c61a99d274 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -36,7 +36,7 @@ static struct msm_gem_submit *submit_create(struct drm_device *dev,
 	if (sz > SIZE_MAX)
 		return ERR_PTR(-ENOMEM);
 
-	submit = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+	submit = kzalloc(sz, GFP_KERNEL);
 	if (!submit)
 		return ERR_PTR(-ENOMEM);
 
@@ -771,25 +771,21 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 	trace_msm_gpu_submit(pid_nr(pid), ring->id, submitid,
 		args->nr_bos, args->nr_cmds);
 
-	ret = mutex_lock_interruptible(&queue->lock);
-	if (ret)
-		goto out_post_unlock;
-
 	if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 		out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 		if (out_fence_fd < 0) {
 			ret = out_fence_fd;
-			goto out_unlock;
+			return ret;
 		}
 	}
 
-	submit = submit_create(dev, gpu, queue, args->nr_bos,
-		args->nr_cmds);
-	if (IS_ERR(submit)) {
-		ret = PTR_ERR(submit);
-		submit = NULL;
-		goto out_unlock;
-	}
+	submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
+	if (IS_ERR(submit))
+		return PTR_ERR(submit);
+
+	ret = mutex_lock_interruptible(&queue->lock);
+	if (ret)
+		goto out_post_unlock;
 
 	submit->pid = pid;
 	submit->ident = submitid;
@@ -965,9 +961,9 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 	if (ret && (out_fence_fd >= 0))
 		put_unused_fd(out_fence_fd);
 	mutex_unlock(&queue->lock);
+out_post_unlock:
 	if (submit)
 		msm_gem_submit_put(submit);
-out_post_unlock:
 	if (!IS_ERR_OR_NULL(post_deps)) {
 		for (i = 0; i < args->nr_out_syncobjs; ++i) {
 			kfree(post_deps[i].chain);
-- 
2.36.1