linux-kernel - [PATCH 1/2] MIPS: Malta: Fix keyboard resource preventing i8042 driver from registering

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.21.2510211919240.8377@angie.orcam.me.uk>
Date: Tue, 21 Oct 2025 20:38:22 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Bjorn Helgaas <helgaas@...nel.org>, 
    Thomas Bogendoerfer <tsbogend@...ha.franken.de>
cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
    Bjorn Helgaas <bhelgaas@...gle.com>, linux-mips@...r.kernel.org, 
    linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] MIPS: Malta: Fix keyboard resource preventing i8042
 driver from registering

MIPS Malta platform code registers the PCI southbridge legacy port I/O 
PS/2 keyboard range as a standard resource marked as busy.  It prevents 
the i8042 driver from registering as it fails to claim the resource in 
a call to i8042_platform_init().  Consequently PS/2 keyboard and mouse 
devices cannot be used with this platform.

Fix the issue by removing the busy marker from the standard reservation, 
making the driver register successfully:

serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12

and the resource show up as expected among the legacy devices:

00000000-00ffffff : MSC PCI I/O
  00000000-0000001f : dma1
  00000020-00000021 : pic1
  00000040-0000005f : timer
  00000060-0000006f : keyboard
    00000060-0000006f : i8042
  00000070-00000077 : rtc0
  00000080-0000008f : dma page reg
  000000a0-000000a1 : pic2
  000000c0-000000df : dma2
  [...]

If the i8042 driver has not been configured, then the standard resource 
will remain there preventing any conflicting dynamic assignment of this 
PCI port I/O address range.

Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@...r.kernel.org
---
 arch/mips/mti-malta/malta-setup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

linux-mips-malta-setup-resource-keyboard.diff
Index: linux-macro/arch/mips/mti-malta/malta-setup.c
===================================================================
--- linux-macro.orig/arch/mips/mti-malta/malta-setup.c
+++ linux-macro/arch/mips/mti-malta/malta-setup.c
@@ -47,7 +47,7 @@ static struct resource standard_io_resou
 		.name = "keyboard",
 		.start = 0x60,
 		.end = 0x6f,
-		.flags = IORESOURCE_IO | IORESOURCE_BUSY
+		.flags = IORESOURCE_IO
 	},
 	{
 		.name = "dma page reg",