linux-kernel - Re: [PATCH 2/2] mpic_u3msi: mpic_u3msi: failed allocation unnoticed

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Message-Id: <df21920e067e73985f73047e2d8bcbda@kernel.crashing.org>
Date:	Thu, 24 Apr 2008 00:09:21 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	paulus@...ba.org, linuxppc-dev@...abs.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mpic_u3msi: mpic_u3msi: failed allocation unnoticed

> bitmap_find_free_region(), called by mpic_msi_alloc_hwirqs() may
> return -ENOMEM, but hwirq of type irq_hw_number_t which is unsigned.

>  	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;
>  		}

Please test for _all_ error values, instead.


Segher

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