On Di, 2018-02-27 at 08:14 +0000, Roger Pau Monné wrote:
On Mon, Feb 26, 2018 at 06:57:03PM +0000, Shah, Amit wrote:
On Mo, 2018-02-26 at 18:14 +0000, Roger Pau Monné wrote:
On Mon, Feb 26, 2018 at 05:36:35PM +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: David Vrabel david.vrabel@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 | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index b6b8b29..96aa575 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -758,6 +758,7 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, error_irq: for (; i >= 0; i--) __unbind_from_irq(irq + i);
- xen_free_irq(irq);
Hm, xen_free_irq calls irq_free_desc, which is irq_free_descs(irq, 1),
Er... right.
I think you will have to introduce a new free function:
xen_free_irqs(unsigned irq, unsigned int nr)
That calls irq_free_descs(irq, nr)
Actually, xen_free_irq() is already done in __unbind_from_irq(), so this patch is actually wrong and not needed.
You still need to free unbound IRQs, AFAICT you could fix the issue with a single patch, like:
while (nvec--) { if (nvec >= i) xen_free_irq(irq + i); else __unbind_from_irq(irq + i); }
Agreed.
However, since these are two different things, I'd still like to separate out into two patches, and two paths so it's easier to see what's being done.
Sending v2 in a bit.
Amit
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