From: Dave Jones <davej@redhat.com>
Date: Mon, 12 Dec 2005 08:37:40 +0000 (-0800)
Subject: [PATCH] ACPI: fix sleeping whilst atomic warnings on resume
X-Git-Tag: v2.6.15-rc6~111
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a64882e795cc1d890e3359d0aa143af1cf67e8d4;p=platform%2Fkernel%2Flinux-3.10.git

[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
--- 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);