From: "Shah, Amit" <aams@amazon.de>
To: "roger.pau@citrix.com" <roger.pau@citrix.com>
Cc: "boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"kys@microsoft.com" <kys@microsoft.com>,
"jgross@suse.com" <jgross@suse.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"shuo.a.liu@intel.com" <shuo.a.liu@intel.com>,
"anoob.soman@citrix.com" <anoob.soman@citrix.com>,
"Valentin, Eduardo" <eduval@lab126.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH v2 2/2] xen: events: free irqs in error condition
Date: Wed, 28 Feb 2018 08:25:23 +0000 [thread overview]
Message-ID: <1519806324.4965.25.camel@amazon.com> (raw)
In-Reply-To: <20180228081623.umnyv4w67h2rsrwk@MacBook-Pro-de-Roger.local>
On Mi, 2018-02-28 at 08:16 +0000, Roger Pau Monné wrote:
> On Tue, Feb 27, 2018 at 05:32:53PM +0000, Shah, Amit wrote:
> >
> >
> > On Di, 2018-02-27 at 17:07 +0000, Roger Pau Monné wrote:
> > >
> > > On Tue, Feb 27, 2018 at 03:55:58PM +0000, Amit Shah wrote:
> > > >
> > > >
> > > > In case of errors in irq setup for MSI, free up the allocated
> > > > irqs.
> > > >
> > > > Fixes: 4892c9b4ada9f9 ("xen: add support for MSI message
> > > > groups")
> > > > Reported-by: Hooman Mirhadi <mirhadih@amazon.com>
> > > > CC: <stable@vger.kernel.org>
> > > > CC: Roger Pau Monné <roger.pau@citrix.com>
> > > > CC: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> > > > CC: Eduardo Valentin <eduval@amazon.com>
> > > > CC: Juergen Gross <jgross@suse.com>
> > > > CC: Thomas Gleixner <tglx@linutronix.de>
> > > > CC: "K. Y. Srinivasan" <kys@microsoft.com>
> > > > CC: Liu Shuo <shuo.a.liu@intel.com>
> > > > CC: Anoob Soman <anoob.soman@citrix.com>
> > > > Signed-off-by: Amit Shah <aams@amazon.com>
> > > > ---
> > > > drivers/xen/events/events_base.c | 5 ++++-
> > > > 1 file changed, 4 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/xen/events/events_base.c
> > > > b/drivers/xen/events/events_base.c
> > > > index c86d10e..a299586 100644
> > > > --- a/drivers/xen/events/events_base.c
> > > > +++ b/drivers/xen/events/events_base.c
> > > > @@ -750,11 +750,14 @@ int xen_bind_pirq_msi_to_irq(struct
> > > > pci_dev
> > > > *dev, struct msi_desc *msidesc,
> > > >
> > > > ret = irq_set_msi_desc(irq, msidesc);
> > > > if (ret < 0)
> > > > - goto error_irq;
> > > > + goto error_desc;
> > > > out:
> > > > mutex_unlock(&irq_mapping_update_lock);
> > > > return irq;
> > > > error_irq:
> > > > + while (--nvec >= i)
> > > > + xen_free_irq(irq + nvec);
> > > > +error_desc:
> > > > while (i > 0) {
> > > > i--;
> > > > __unbind_from_irq(irq + i);
> > > It seems pointless to introduce another label and another loop to
> > > fix
> > > something that can be fixed with a single label and a single
> > > loop,
> > > this just makes the code more complex for no reason.
> > I disagree, just because there are two different cleanups to be
> > made
> > for two different issues; it's not as if the if.. and else
> > conditions
> > are going to be interleaved.
> Oh, I don't mind so much whether it ends up being two patches or a
> single one, but IMHO the code should end up looking similar to what I
> proposed, I would like to avoid having two loops and two labels.
>
> Could you rework the series so that the end result uses a single loop
> (and label)?
That was the part I didn't like much, so it would be better if the
patch came from you :)
Amit
Amazon Development Center Germany GmbH
Berlin - Dresden - Aachen
main office: Krausenstr. 38, 10117 Berlin
Geschaeftsfuehrer: Dr. Ralf Herbrich, Christian Schlaeger
Ust-ID: DE289237879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B
next prev parent reply other threads:[~2018-02-28 8:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-27 15:55 [PATCH v2 0/2] xen: fix bugs in error conditions Amit Shah
2018-02-27 15:55 ` [PATCH v2 1/2] xen: fix out-of-bounds irq unbind for MSI message groups Amit Shah
2018-02-27 16:58 ` Roger Pau Monné
2018-02-27 15:55 ` [PATCH v2 2/2] xen: events: free irqs in error condition Amit Shah
2018-02-27 17:07 ` Roger Pau Monné
2018-02-27 17:32 ` Shah, Amit
2018-02-28 8:16 ` Roger Pau Monné
2018-02-28 8:25 ` Shah, Amit [this message]
2018-02-28 8:27 ` Juergen Gross
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