Re: [PATCH v2 3/4] drm/shmem-helper: Align to page size in dumb_create

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Am 03.06.21 um 17:03 schrieb Daniel Vetter:
shmem helpers seem a bit sloppy here by automatically rounding up when
actually creating the buffer, which results in under-reporting of what
we actually have. Caught by igt/vgem_basic tests.

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

---
  drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 32f1d7601ec6..2985744b4300 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -506,13 +506,13 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
if (!args->pitch || !args->size) {
  		args->pitch = min_pitch;
-		args->size = args->pitch * args->height;
+		args->size = PAGE_ALIGN(args->pitch * args->height);
  	} else {
  		/* ensure sane minimum values */
  		if (args->pitch < min_pitch)
  			args->pitch = min_pitch;
  		if (args->size < args->pitch * args->height)
-			args->size = args->pitch * args->height;
+			args->size = PAGE_ALIGN(args->pitch * args->height);
  	}
shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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