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| author |   Yinghai Lu <yinghai@kernel.org> | 2009-05-06 10:07:07 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-05-11 10:35:07 +0200 |
| commit | ee214558c2e959781a406e76c5b34364da638e1d (patch) | |
| tree | 5fc0218815773b7eba93c91dc9e1972bf4f43954 /arch/x86/kernel/mpparse.c | |
| parent | x86/acpi: remove irq-compression trick on 32-bit (diff) | |
| download | linux-dev-ee214558c2e959781a406e76c5b34364da638e1d.tar.xz linux-dev-ee214558c2e959781a406e76c5b34364da638e1d.zip | |
x86: fix alloc_mptable()
Fix the conditions when we stop updating the mptable due to
running out of slots.
[ Impact: fix memory corruption / non-working update_mptable boot parameter ]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Len Brown <lenb@kernel.org>
LKML-Reference: <4A01C3BB.1000609@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/mpparse.c')
| -rw-r--r-- | arch/x86/kernel/mpparse.c | 25 |
1 files changed, 9 insertions, 16 deletions
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c index 70fd7e414c15..cd2a41a7c45c 100644 --- a/arch/x86/kernel/mpparse.c +++ b/arch/x86/kernel/mpparse.c @@ -870,24 +870,17 @@ static inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {} #endif /* CONFIG_X86_IO_APIC */ -static int check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, - int count) +static int +check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count) { - if (!mpc_new_phys) { - pr_info("No spare slots, try to append...take your risk, " - "new mpc_length %x\n", count); - } else { - if (count <= mpc_new_length) - pr_info("No spare slots, try to append..., " - "new mpc_length %x\n", count); - else { - pr_err("mpc_new_length %lx is too small\n", - mpc_new_length); - return -1; - } + int ret = 0; + + if (!mpc_new_phys || count <= mpc_new_length) { + WARN(1, "update_mptable: No spare slots (length: %x)\n", count); + return -1; } - return 0; + return ret; } static int __init replace_intsrc_all(struct mpc_table *mpc, @@ -946,7 +939,7 @@ static int __init replace_intsrc_all(struct mpc_table *mpc, } else { struct mpc_intsrc *m = (struct mpc_intsrc *)mpt; count += sizeof(struct mpc_intsrc); - if (!check_slot(mpc_new_phys, mpc_new_length, count)) + if (check_slot(mpc_new_phys, mpc_new_length, count) < 0) goto out; assign_to_mpc_intsrc(&mp_irqs[i], m); mpc->length = count; |