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([2405:201:d019:4042:80a6:7dd7:b597:d951]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2985c2ccafesm168572415ad.97.2025.11.18.01.57.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 01:57:15 -0800 (PST) From: Sukrut Heroorkar To: Helge Deller , Sukrut Heroorkar , linux-fbdev@vger.kernel.org (open list:FRAMEBUFFER LAYER), dri-devel@lists.freedesktop.org (open list:FRAMEBUFFER LAYER), linux-kernel@vger.kernel.org (open list) Cc: shuah@kernel.org, david.hunter.linux@gmail.com Subject: [PATCH] fbdev: q40fb: request memory region Date: Tue, 18 Nov 2025 15:26:55 +0530 Message-ID: <20251118095700.393474-1-hsukrut3@gmail.com> X-Mailer: git-send-email 2.43.0 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" The q40fb driver uses a fixed physical address but never reserves the corresponding I/O region. Reserve the range as suggested in Documentation/gpu/todo.rst ("Request memory regions in all fbdev drivers"). No functional change beyond claming the resource. This change is compile tested only. Signed-off-by: Sukrut Heroorkar --- drivers/video/fbdev/q40fb.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/video/fbdev/q40fb.c b/drivers/video/fbdev/q40fb.c index 1ff8fa176124..935260326c6f 100644 --- a/drivers/video/fbdev/q40fb.c +++ b/drivers/video/fbdev/q40fb.c @@ -101,6 +101,12 @@ static int q40fb_probe(struct platform_device *dev) info->par =3D NULL; info->screen_base =3D (char *) q40fb_fix.smem_start; =20 + if (!request_mem_region(q40fb_fix.smem_start, q40fb_fix.smem_len, + "q40fb")) { + dev_err(&dev->dev, "cannot reserve video memory at 0x%lx\n", + q40fb_fix.smem_start); + } + if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { framebuffer_release(info); return -ENOMEM; @@ -144,6 +150,7 @@ static int __init q40fb_init(void) if (ret) platform_driver_unregister(&q40fb_driver); } + return ret; } =20 --=20 2.43.0