From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from natsmtp00.rzone.de (natsmtp00.rzone.de [81.169.145.165]) by ozlabs.org (Postfix) with ESMTP id 9F1D267B6B for ; Mon, 11 Sep 2006 21:55:02 +1000 (EST) Date: Mon, 11 Sep 2006 13:53:54 +0200 From: Olaf Hering To: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org Subject: [PATCH] Prevent legacy io access on pmac Message-ID: <20060911115354.GA23884@aepfle.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The ppc32 common config runs also on PReP/CHRP, which uses PC style IO devices. The probing is bogus, it crashes or floods dmesg. ppc can boot one single binary on prep, chrp and pmac boards. ppc64 can boot one single binary on pseries and G5 boards. pmac has no legacy io, probing for PC style legacy hardware leads to a hard crash: * add check for parport_pc, exit on pmac. 32bit chrp has no ->check_legacy_ioport, the probe is always called. 64bit chrp has check_legacy_ioport, check for a "parallel" node * add check for isapnp, only PReP boards may have real ISA slots. 32bit PReP will have no ->check_legacy_ioport, the probe is always called. * update code in i8042_platform_init. Run ->check_legacy_ioport first, always call request_region. No functional change. Remove whitespace before i8042_reset init. Signed-off-by: Olaf Hering --- arch/powerpc/platforms/pseries/setup.c | 6 ++++++ drivers/input/serio/i8042-io.h | 13 +++++-------- drivers/parport/parport_pc.c | 4 ++++ drivers/pnp/pnpbios/core.c | 8 ++++++++ include/asm-powerpc/io.h | 2 ++ 5 files changed, 25 insertions(+), 8 deletions(-) Index: linux-2.6.18-rc6/arch/powerpc/platforms/pseries/setup.c =================================================================== --- linux-2.6.18-rc6.orig/arch/powerpc/platforms/pseries/setup.c +++ linux-2.6.18-rc6/arch/powerpc/platforms/pseries/setup.c @@ -401,6 +401,12 @@ static int pSeries_check_legacy_ioport(u return -ENODEV; of_node_put(np); break; + case PARALLEL_BASE: + np = of_find_node_by_type(NULL, "parallel"); + if (np == NULL) + return -ENODEV; + of_node_put(np); + break; } return 0; } Index: linux-2.6.18-rc6/drivers/input/serio/i8042-io.h =================================================================== --- linux-2.6.18-rc6.orig/drivers/input/serio/i8042-io.h +++ linux-2.6.18-rc6/drivers/input/serio/i8042-io.h @@ -67,25 +67,22 @@ static inline int i8042_platform_init(vo * On some platforms touching the i8042 data register region can do really * bad things. Because of this the region is always reserved on such boxes. */ -#if !defined(__sh__) && !defined(__alpha__) && !defined(__mips__) && !defined(CONFIG_PPC_MERGE) - if (!request_region(I8042_DATA_REG, 16, "i8042")) - return -EBUSY; -#endif - - i8042_reset = 1; - #if defined(CONFIG_PPC_MERGE) if (check_legacy_ioport(I8042_DATA_REG)) return -EBUSY; +#endif +#if !defined(__sh__) && !defined(__alpha__) && !defined(__mips__) if (!request_region(I8042_DATA_REG, 16, "i8042")) return -EBUSY; #endif + + i8042_reset = 1; return 0; } static inline void i8042_platform_exit(void) { -#if !defined(__sh__) && !defined(__alpha__) && !defined(CONFIG_PPC64) +#if !defined(__sh__) && !defined(__alpha__) release_region(I8042_DATA_REG, 16); #endif } Index: linux-2.6.18-rc6/drivers/parport/parport_pc.c =================================================================== --- linux-2.6.18-rc6.orig/drivers/parport/parport_pc.c +++ linux-2.6.18-rc6/drivers/parport/parport_pc.c @@ -3374,6 +3374,10 @@ __setup("parport_init_mode=",parport_ini static int __init parport_pc_init(void) { +#if defined(CONFIG_PPC_MERGE) + if (check_legacy_ioport(PARALLEL_BASE)) + return -EBUSY; +#endif if (parse_parport_params()) return -EINVAL; Index: linux-2.6.18-rc6/include/asm-powerpc/io.h =================================================================== --- linux-2.6.18-rc6.orig/include/asm-powerpc/io.h +++ linux-2.6.18-rc6/include/asm-powerpc/io.h @@ -11,6 +11,8 @@ /* Check of existence of legacy devices */ extern int check_legacy_ioport(unsigned long base_port); +#define PARALLEL_BASE 0x378 +#define PNPBIOS_BASE 0xf000 /* only relevant for PReP */ #ifndef CONFIG_PPC64 #include Index: linux-2.6.18-rc6/drivers/pnp/pnpbios/core.c =================================================================== --- linux-2.6.18-rc6.orig/drivers/pnp/pnpbios/core.c +++ linux-2.6.18-rc6/drivers/pnp/pnpbios/core.c @@ -526,6 +526,10 @@ static int __init pnpbios_init(void) { int ret; +#if defined(CONFIG_PPC_MERGE) + if (check_legacy_ioport(PNPBIOS_BASE)) + return -ENODEV; +#endif if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) { printk(KERN_INFO "PnPBIOS: Disabled\n"); return -ENODEV; @@ -575,6 +579,10 @@ subsys_initcall(pnpbios_init); static int __init pnpbios_thread_init(void) { +#if defined(CONFIG_PPC_MERGE) + if (check_legacy_ioport(PNPBIOS_BASE)) + return 0; +#endif if (pnpbios_disabled) return 0; #ifdef CONFIG_HOTPLUG