drm/repaper: Reduce temporary buffer size in repaper_fb_dirty()

[ Upstream commit fedf429e071f6dbbe7a69dfc342492e037692018 ]

As the temporary buffer is no longer used to store 8-bit grayscale data,
its size can be reduced to the size needed to store the monochrome
bitmap data.

Fixes: 24c6bedefbe71de9 ("drm/repaper: Use format helper for xrgb8888 to monochrome conversion")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220317081830.1211400-6-geert@linux-m68k.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c
index e62f4d1..7e2b0e2 100644 (file)
--- a/drivers/gpu/drm/tiny/repaper.c
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -533,7 +533,7 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb)
        DRM_DEBUG("Flushing [FB:%d] st=%ums\n", fb->base.id,
                  epd->factored_stage_time);
 
-       buf = kmalloc_array(fb->width, fb->height, GFP_KERNEL);
+       buf = kmalloc(fb->width * fb->height / 8, GFP_KERNEL);
        if (!buf) {
                ret = -ENOMEM;
                goto out_exit;