[PATCH] ACPI: fix sleeping whilst atomic warnings on resume

This has been broken for months.  On resume, we call acpi_pci_link_set()
with interrupts off, so we get a warning when we try to do a kmalloc of non
atomic memory.  The actual allocation is just 2 long's (plus extra byte for
some reason I can't fathom), so a simple conversion to GFP_ATOMIC is
probably the safest way to fix this.

The error looks like this..

Debug: sleeping function called from invalid context at mm/slab.c:2486
in_atomic():0, irqs_disabled():1
 [<c0143f6c>] kmem_cache_alloc+0x40/0x56
 [<c0206a2e>] acpi_pci_link_set+0x3f/0x17f
 [<c0206f96>] irqrouter_resume+0x1e/0x3c
 [<c0239bca>] __sysdev_resume+0x11/0x6b
 [<c0239e88>] sysdev_resume+0x34/0x52
 [<c023de21>] device_power_up+0x5/0xa

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 82292b7..78927c0 100644 (file)
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -316,7 +316,7 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
        if (!link || !irq)
                return_VALUE(-EINVAL);
 
-       resource = kmalloc(sizeof(*resource) + 1, GFP_KERNEL);
+       resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC);
        if (!resource)
                return_VALUE(-ENOMEM);