From: Daniel J Blueman Date: Wed, 18 May 2011 23:31:31 +0000 (-0700) Subject: x86, ioapic: Fix potential resume deadlock X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b64ce24daffb634b5b3133a2e411bd4de50654e8;p=linux-beck.git x86, ioapic: Fix potential resume deadlock Fix a potential deadlock when resuming; here the calling function has disabled interrupts, so we cannot sleep. Change the memory allocation flag from GFP_KERNEL to GFP_ATOMIC. TODO: We can do away with this memory allocation during resume by reusing the ioapic suspend/resume code that uses boot time allocated buffers, but we want to keep this -stable patch simple. Signed-off-by: Daniel J Blueman Signed-off-by: Suresh Siddha Cc: # v2.6.38/39 Link: http://lkml.kernel.org/r/20110518233157.385970138@sbsiddha-MOBL3.sc.intel.com Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 45fd33d1fd3a..df636209193e 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -621,14 +621,14 @@ struct IO_APIC_route_entry **alloc_ioapic_entries(void) struct IO_APIC_route_entry **ioapic_entries; ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics, - GFP_KERNEL); + GFP_ATOMIC); if (!ioapic_entries) return 0; for (apic = 0; apic < nr_ioapics; apic++) { ioapic_entries[apic] = kzalloc(sizeof(struct IO_APIC_route_entry) * - nr_ioapic_registers[apic], GFP_KERNEL); + nr_ioapic_registers[apic], GFP_ATOMIC); if (!ioapic_entries[apic]) goto nomem; }