linux-kernel - [PATCH v3] drm/shmem: Cleanup drm_gem_shmem_create_with

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Date:   Mon, 23 Jan 2023 07:48:31 -0800
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Steven Price <steven.price@....com>,
        Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3] drm/shmem: Cleanup drm_gem_shmem_create_with_handle()

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

Once we create the handle, the handle owns the reference.  Currently
nothing was doing anything with the shmem ptr after the handle was
created, but let's change drm_gem_shmem_create_with_handle() to not
return the pointer, so-as to not encourage problematic use of this
function in the future.  As a bonus, it makes the code a bit cleaner.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index f21f47737817..42c496c5f92c 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -415,7 +415,7 @@ void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem,
 }
 EXPORT_SYMBOL(drm_gem_shmem_vunmap);
 
-static struct drm_gem_shmem_object *
+static int
 drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
 				 struct drm_device *dev, size_t size,
 				 uint32_t *handle)
@@ -425,7 +425,7 @@ drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
 
 	shmem = drm_gem_shmem_create(dev, size);
 	if (IS_ERR(shmem))
-		return shmem;
+		return PTR_ERR(shmem);
 
 	/*
 	 * Allocate an id of idr table where the obj is registered
@@ -434,10 +434,8 @@ drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
 	ret = drm_gem_handle_create(file_priv, &shmem->base, handle);
 	/* drop reference from allocate - handle holds it now. */
 	drm_gem_object_put(&shmem->base);
-	if (ret)
-		return ERR_PTR(ret);
 
-	return shmem;
+	return ret;
 }
 
 /* Update madvise status, returns true if not purged, else
@@ -520,7 +518,6 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
 			      struct drm_mode_create_dumb *args)
 {
 	u32 min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
-	struct drm_gem_shmem_object *shmem;
 
 	if (!args->pitch || !args->size) {
 		args->pitch = min_pitch;
@@ -533,9 +530,7 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
 			args->size = PAGE_ALIGN(args->pitch * args->height);
 	}
 
-	shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
-
-	return PTR_ERR_OR_ZERO(shmem);
+	return drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
 }
 EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create);
 
-- 
2.38.1