linux-kernel - Re: [PATCH] Fix two potential mem leaks in MPT Fusion (mpt

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Message-ID: <9a8748490708020120w4bbfe6d1n6f6986aec507316@mail.gmail.com>
Date:	Thu, 2 Aug 2007 10:20:47 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Eric Moore" <Eric.Moore@....com>, DL-MPTFusionLinux@....com,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	support@....com, mpt_linux_developer@....com,
	linux-scsi@...r.kernel.org,
	"James Bottomley" <James.Bottomley@...eleye.com>
Subject: Re: [PATCH] Fix two potential mem leaks in MPT Fusion (mpt_attach())

On 02/08/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Thu, 2 Aug 2007 01:55:33 +0200
> Jesper Juhl <jesper.juhl@...il.com> wrote:
>
[snip]
> > +++ b/drivers/message/fusion/mptbase.c
> > @@ -1393,18 +1393,18 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
> >       struct proc_dir_entry *dent, *ent;
> >  #endif
> >
> > +     if (mpt_debug_level)
> > +             printk(KERN_INFO MYNAM ": mpt_debug_level=%xh\n", mpt_debug_level);
> > +
> > +     if (pci_enable_device(pdev))
> > +             return r;
> > +
> >       ioc = kzalloc(sizeof(MPT_ADAPTER), GFP_ATOMIC);
>
> Why on earth is that using GFP_ATOMIC?  This function later goes on to
> create procfs files and such things.
>
Dunno. But you are right, that does seem a bit odd, but I assumed
there was a reason for it.

>
> y'know, we could have a debug option which will spit warnings if someone
> does a !__GFP_WAIT allocation while !in_atomic() (only works if
> CONFIG_PREEMPT).
>
> But please, make it depend on !CONFIG_AKPM.  I shudder to think about all
> the stuff it would pick up.
>

I can try to cook up something like that tonight...

-- 
Jesper Juhl <jesper.juhl@...il.com>
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