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[107.220.129.194]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b3933a6554sm57571227b3.12.2026.11.11.16.28.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 16:28:56 -0800 (PST) From: Matt Turner Date: Wed, 11 Nov 2026 19:28:56 -0500 Subject: [PATCH] vgacon: Fall back to the dummy console if mapping VGA memory fails X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261111-vgacon-ioremap-null-v1-1-6dd05bf390ef@gmail.com> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/yXMQQ5AMBCF4avIrE2iIoiriEW1gxFaaRFJ4+6Kt /sW7w/gyTF5aJIAjk72bE2ESBNQkzQjIetoyLO8FHF4jlJZg2wdrXJDcywLSl2oStRFX2cVxOf maODrq7bdb3/0M6n9TcF9P4NsHx93AAAA X-Change-ID: 20261111-vgacon-ioremap-null-ad4c7184b807 To: Greg Kroah-Hartman , Helge Deller Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, stable@vger.kernel.org, Matt Turner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1460; i=mattst88@gmail.com; h=from:subject:message-id; bh=br3GFCtz3RXFRK3DsA4LkWP9fcwbxa8J0zn4MRkuUF4=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLK+criL7v37qOiykO8rawfHuuk+WyP0ikzsHuj9nsVwQ sin7fCvjo8sDGJcDDPFFFni1iuyzGrbsdTntPQvmDmsTCBDpEUaGICAhYEvNzGv1EjHSM9U21DP EMjQMYqHyOkxaGQWF5emFummFRQ55OWXJJZk5ucV6+UXpOYVpBfopWWmlWRk5BcVpwKN0MtLLTF 1dXQzMjQwsXS0MHOycDQ1cXZ2MnRyc3R0dnUysjQ3MXC2dDRxtTRn4OIUgLnmUTAjQ9v1oF3ZfR 8OxC4xawm0WOOg2hj571rb9g/LopWvnRE9dpPhnybXhpaPzH/zz0vn7L19vfNZ3UWnSt4l31dM5 BKapXb7CDMA X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A On Alpha, setup_arch() registers vgacon whenever CONFIG_VGA_CONSOLE is enabled. On Marvel (EV7) systems whose SRM console is serial, no VGA hose is set, so marvel_ioremap() finds no hose for 0xb8000 and returns NULL. vgacon_startup() then probes video memory through that NULL pointer and oopses in console_init(): Unable to handle kernel paging request at virtual address 0000000000000000 pc is at vgacon_startup+0x174/0x910 VGA_MAP_MEM() is ioremap() on Alpha and powerpc and can fail. Treat failure like a failed probe and fall back to the dummy console. If a VGA card is present, locate_and_init_vga() still switches to vgacon once PCI is up. Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Matt Turner --- drivers/video/console/vgacon.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index e7e6750f1f87..09f7c376b468 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -324,6 +324,8 @@ static const char *vgacon_startup(void) } vga_vram_base = VGA_MAP_MEM(vga_vram_base, vga_vram_size); + if (!vga_vram_base) + goto no_vga; vga_vram_end = vga_vram_base + vga_vram_size; /* --- base-commit: fa4ad798f6f681031775266044ba1b0cf3c670bd change-id: 20261111-vgacon-ioremap-null-ad4c7184b807 Best regards, -- Matt Turner