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Mon, 20 Oct 2025 03:58:13 -0700 (PDT) Received: from bhk ([165.50.81.231]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b65e8971897sm751474166b.37.2025.10.20.03.58.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Oct 2025 03:58:13 -0700 (PDT) From: Mehdi Ben Hadj Khelifa To: lanzano.alex@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, khalid@kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, Mehdi Ben Hadj Khelifa Subject: [PATCH] drm/tiny: Refactor framebuffer's size calculation Date: Mon, 20 Oct 2025 12:57:23 +0100 Message-ID: <20251020115803.192572-1-mehdi.benhadjkhelifa@gmail.com> X-Mailer: git-send-email 2.51.1.dirty Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use drm_format_info_min_pitch() to calculate the framebuffer line pitch instead of directly multiplying width and height. This aligns with DRM helpers for determining per-line byte size and avoids manual assumptions about bytes per pixel. Suggested-by: Thomas Zimmermann Signed-off-by: Mehdi Ben Hadj Khelifa --- drivers/gpu/drm/tiny/repaper.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c index 4824f863fdba..aeff49bc6ba7 100644 --- a/drivers/gpu/drm/tiny/repaper.c +++ b/drivers/gpu/drm/tiny/repaper.c @@ -517,6 +517,8 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,= const struct iosys_map * unsigned int dst_pitch =3D 0; struct iosys_map dst; struct drm_rect clip; + const struct drm_format_info *info =3D fb->format; + size_t pitch; int idx, ret =3D 0; u8 *buf =3D NULL; =20 @@ -534,7 +536,9 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,= const struct iosys_map * DRM_DEBUG("Flushing [FB:%d] st=3D%ums\n", fb->base.id, epd->factored_stage_time); =20 - buf =3D kmalloc(fb->width * fb->height / 8, GFP_KERNEL); + pitch =3D drm_format_info_min_pitch(info, 0, fb->width); + + buf =3D kmalloc_array(fb->height, pitch, GFP_KERNEL); if (!buf) { ret =3D -ENOMEM; goto out_exit; --=20 2.51.1.dirty