linux-kernel - [PATCH 2/2] powerpc: mpic_pasemi_msi: failed allocation unnoticed

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Message-ID: <480F69C9.4040208@tiscali.nl>
Date:	Wed, 23 Apr 2008 18:54:33 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	paulus@...ba.org, linuxppc-dev@...abs.org
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] powerpc: mpic_pasemi_msi: failed allocation unnoticed

A similar problem in arch/powerpc/sysdev/mpic_u3msi.c:
---
bitmap_find_free_region(), called by mpic_msi_alloc_hwirqs() may
return -ENOMEM, but hwirq of type irq_hw_number_t which is unsigned.

Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
The functions can be found respectively in:
//---[ vi lib/bitmap.c +807 ]---
//---[ vi arch/powerpc/sysdev/mpic_msi.c +39 ]---

diff --git a/arch/powerpc/sysdev/mpic_u3msi.c b/arch/powerpc/sysdev/mpic_u3msi.c
index 1d5a408..30a4e27 100644
--- a/arch/powerpc/sysdev/mpic_u3msi.c
+++ b/arch/powerpc/sysdev/mpic_u3msi.c
@@ -122,7 +122,7 @@ static int u3msi_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 
 	list_for_each_entry(entry, &pdev->msi_list, list) {
 		hwirq = mpic_msi_alloc_hwirqs(msi_mpic, 1);
-		if (hwirq < 0) {
+		if (hwirq == -ENOMEM) {
 			pr_debug("u3msi: failed allocating hwirq\n");
 			return hwirq;
 		}
--
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