linux-kernel - [PATCH -v3 3/3] pci: don't allocate from a BUSY bus resource

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Message-ID: <4BC4E115.90805@oracle.com>
Date:	Tue, 13 Apr 2010 14:24:37 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andy Isaacson <adi@...apodia.org>, guenter.roeck@...csson.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>
Subject: [PATCH -v3 3/3] pci: don't allocate from a BUSY bus resource



  Drivers typically use pci_request_regions() to reserve the resources
  they use, but that fails if the resource is already busy.  Therefore,
  we should ignore busy resources when we're assigning resources to a
  device.

[commit log is from Bjorn]

Tested-by: Andy Isaacson <adi@...apodia.org>
Cc: Bjorn Helgaas <bjorn.helgaas@...com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@...com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 drivers/pci/bus.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/drivers/pci/bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/bus.c
+++ linux-2.6/drivers/pci/bus.c
@@ -103,6 +103,10 @@ pci_bus_alloc_resource(struct pci_bus *b
 		if (!r)
 			continue;
 
+		/* Driver can not reserve it later, so don't use it */
+		if (r->flags & IORESOURCE_BUSY)
+			continue;
+
 		/* type_mask must match */
 		if ((res->flags ^ r->flags) & type_mask)
 			continue;
--
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