From 1a4117470dde893abb363bf54601230c274b9a68 Mon Sep 17 00:00:00 2001 From: Leann Ogasawara Date: Mon, 9 Apr 2012 20:30:08 -0700 Subject: [PATCH] Revert "x86/ioapic: Add register level checks to detect bogus io-apic entries" BugLink: http://bugs.launchpad.net/bugs/974982 This reverts commit 73d63d038ee9f769f5e5b46792d227fe20e442c5. This patch results in a NULL pointer dereference which renders a system unbootable if attempting to boot in pvops mode. We received this patch via upstream stable v3.2.14. However, upstream discussion indicates this patch was not meant to be included in any v3.2.y upstream stable release. Revert it. http://www.mail-archive.com/stable@vger.kernel.org/msg04782.html Acked-by: Tim Gardner Acked-by: Stefan Bader Signed-off-by: Leann Ogasawara --- arch/x86/kernel/apic/io_apic.c | 40 ++++++++-------------------------------- 1 file changed, 8 insertions(+), 32 deletions(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index a25e276..6d939d7 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -3963,36 +3963,18 @@ int mp_find_ioapic_pin(int ioapic, u32 gsi) static __init int bad_ioapic(unsigned long address) { if (nr_ioapics >= MAX_IO_APICS) { - pr_warn("WARNING: Max # of I/O APICs (%d) exceeded (found %d), skipping\n", - MAX_IO_APICS, nr_ioapics); + printk(KERN_WARNING "WARNING: Max # of I/O APICs (%d) exceeded " + "(found %d), skipping\n", MAX_IO_APICS, nr_ioapics); return 1; } if (!address) { - pr_warn("WARNING: Bogus (zero) I/O APIC address found in table, skipping!\n"); + printk(KERN_WARNING "WARNING: Bogus (zero) I/O APIC address" + " found in table, skipping!\n"); return 1; } return 0; } -static __init int bad_ioapic_register(int idx) -{ - union IO_APIC_reg_00 reg_00; - union IO_APIC_reg_01 reg_01; - union IO_APIC_reg_02 reg_02; - - reg_00.raw = io_apic_read(idx, 0); - reg_01.raw = io_apic_read(idx, 1); - reg_02.raw = io_apic_read(idx, 2); - - if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) { - pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n", - mpc_ioapic_addr(idx)); - return 1; - } - - return 0; -} - void __init mp_register_ioapic(int id, u32 address, u32 gsi_base) { int idx = 0; @@ -4009,12 +3991,6 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base) ioapics[idx].mp_config.apicaddr = address; set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address); - - if (bad_ioapic_register(idx)) { - clear_fixmap(FIX_IO_APIC_BASE_0 + idx); - return; - } - ioapics[idx].mp_config.apicid = io_apic_unique_id(id); ioapics[idx].mp_config.apicver = io_apic_get_version(idx); @@ -4035,10 +4011,10 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base) if (gsi_cfg->gsi_end >= gsi_top) gsi_top = gsi_cfg->gsi_end + 1; - pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n", - idx, mpc_ioapic_id(idx), - mpc_ioapic_ver(idx), mpc_ioapic_addr(idx), - gsi_cfg->gsi_base, gsi_cfg->gsi_end); + printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, " + "GSI %d-%d\n", idx, mpc_ioapic_id(idx), + mpc_ioapic_ver(idx), mpc_ioapic_addr(idx), + gsi_cfg->gsi_base, gsi_cfg->gsi_end); nr_ioapics++; } -- 1.7.10.4