linux-kernel - Re: Regression with commit f9cde5f in 2.6.30-gitX

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Date:	Wed, 24 Jun 2009 17:46:27 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Gary Hade <garyhade@...ibm.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>, Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Regression with commit f9cde5f in 2.6.30-gitX

On Tue, 2009-06-23 at 20:33 -0500, Larry Finger wrote:
> My latest pull from Linus's tree fails to boot. Bisection leads to the
> commit entitled "x86/ACPI: Correct maximum allowed _CRS returned
> resources and warn if exceeded" with hash
> f9cde5ffed17bf74f6bef042d99edb0622f58576. I have been unable to
> capture the first error message as it scrolls off the screen, but the
> second hits the WARN_ON at drivers/ata/ahci.c:695 in routine
> ahci_enable_ahci() because HOST_AHCI_EN is not set.
> 

This patch fixes boot failure on my AMD 64 laptop, can you please test
this patch:

[PATCH] x86: fix _CRS resources return handling

We need to check for info->res_num and only handle for < PCI_BUS_NUM_RESOURCES

Also set info->bus->resource[info->res_num] for _CRS resources return handling

Fixed boot failure on some machine.

Reported-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/pci/acpi.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 16c3fda..0bc015f 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -69,6 +69,9 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
 	struct resource *root;
 	int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
 
+	if (info->res_num >= PCI_BUS_NUM_RESOURCES)
+		return AE_OK;
+
 	status = resource_to_addr(acpi_res, &addr);
 	if (!ACPI_SUCCESS(status))
 		return AE_OK;
@@ -94,17 +97,18 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
 	if (bus_has_transparent_bridge(info->bus))
 		max_root_bus_resources -= 3;
 	if (info->res_num >= max_root_bus_resources) {
-		printk(KERN_WARNING "PCI: Failed to allocate 0x%lx-0x%lx "
-			"from %s for %s due to _CRS returning more than "
-			"%d resource descriptors\n", (unsigned long) res->start,
-			(unsigned long) res->end, root->name, info->name,
-			max_root_bus_resources);
+		pr_warning("PCI: Failed to allocate 0x%lx-0x%lx "
+			   "from %s for %s due to _CRS returning more than "
+			   "%d resource descriptors\n",
+			   (unsigned long)res->start, (unsigned long)res->end,
+			   root->name, info->name, max_root_bus_resources);
+		info->bus->resource[info->res_num] = res;
 		info->res_num++;
 		return AE_OK;
 	}
 
 	if (insert_resource(root, res)) {
-		printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
+		pr_err("PCI: Failed to allocate 0x%lx-0x%lx "
 			"from %s for %s\n", (unsigned long) res->start,
 			(unsigned long) res->end, root->name, info->name);
 	} else {
-- 
1.6.0.6



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