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Date: Mon, 7 Aug 2006 16:30:43 +0200 (CEST) From: Jiri Kosina <jikos@...os.cz> To: Len Brown <len.brown@...el.com> cc: linux-acpi@...el.com, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org> Subject: [RESEND] [PATCH] ACPI - change GFP_ATOMIC to GFP_KERNEL for non-atomic allocation Hi, acpi_pci_link_set() allocates with GFP_ATOMIC. On resume from suspend, this is called with interrupts off, otherwise GFP_KERNEL is safe. On the other hand, when resuming from suspend with interrupts off, the following callchain allocates with GFP_KERNEL, which is wrong: acpi_pci_link_resume -> acpi_pci_link_set -> acpi_set_current_resources -> acpi_rs_set_srs_method_data -> acpi_ut_create_internal_object_dbg -> acpi_ut_allocate_object_desc_dbg -> acpi_os_acquire_object -> kmem_cache_alloc(GFP_KERNEL) flag. Resending patch, which didn't make it into -rc4, to fix both issues. The patch is intentionally using irqs_disabled() and does not check in_resume flag, as this is marked for removal (which is for example how acpi_os_allocate() checks whether it should perform GFP_KERNEL or GFP_ATOMIC allocation). Signed-off-by: Jiri Kosina <jikos@...os.cz> --- drivers/acpi/osl.c.orig 2006-07-15 21:00:43.000000000 +0200 +++ drivers/acpi/osl.c 2006-07-23 16:03:08.000000000 +0200 @@ -1141,7 +1141,13 @@ acpi_status acpi_os_release_object(acpi_ void *acpi_os_acquire_object(acpi_cache_t * cache) { - void *object = kmem_cache_alloc(cache, GFP_KERNEL); + void *object; + + /* irqs could be disabled when resuming from suspend */ + if (irqs_disabled()) + object = kmem_cache_alloc(cache, GFP_ATOMIC); + else + object = kmem_cache_alloc(cache, GFP_KERNEL); WARN_ON(!object); return object; } --- drivers/acpi/pci_link.c.orig 2006-07-15 21:00:43.000000000 +0200 +++ drivers/acpi/pci_link.c 2006-07-23 16:01:42.000000000 +0200 @@ -318,7 +318,12 @@ static int acpi_pci_link_set(struct acpi if (!link || !irq) return_VALUE(-EINVAL); - resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC); + /* irqs could be disabled when resuming from suspend */ + if (irqs_disabled()) + resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC); + else + resource = kmalloc(sizeof(*resource) + 1, GFP_KERNEL); + if (!resource) return_VALUE(-ENOMEM); -- JiKos. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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