linux-kernel - pci_find_parent

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Message-ID: <4AF875D0.10602@kernel.org>
Date:	Mon, 09 Nov 2009 12:04:32 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Matthew Wilcox <matthew@....cx>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: pci_find_parent_resource patch

it seems this patch from Linus get lost ?

-----------------------------------------------------



from Linus

---
 drivers/pci/pci.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -382,8 +382,12 @@ pci_find_parent_resource(const struct pc
 			continue;	/* Wrong type */
 		if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
 			return r;	/* Exact match */
-		if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH))
-			best = r;	/* Approximating prefetchable by non-prefetchable */
+		/* We can't insert a non-prefetch resource inside a prefetchable parent .. */
+		if (r->flags & IORESOURCE_PREFETCH)
+			continue;
+		/* .. but we can put a prefetchable resource inside a non-prefetchable one */
+		if (!best)
+			best = r;
 	}
 	return best;
 }
--
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