On Tue, Feb 27, 2018 at 03:55:57PM +0000, Amit Shah wrote:
> When an MSI descriptor was not available, the error path would try to
> unbind an irq that was never acquired - potentially unbinding an
> unrelated irq.
Those IRQs have been allocated in the xen_allocate_irqs_dynamic call,
so I think the "potentially unbinding an unrelated irq" part is wrong.
The unbind call would be performed against an unbound IRQ, which is
harmless AFAICT.
> Fixes: 4892c9b4ada9f9 ("xen: add support for MSI message groups")
> Reported-by: Hooman Mirhadi <mirha...@amazon.com>
> CC: <sta...@vger.kernel.org>
> CC: Roger Pau Monné <roger....@citrix.com>
> CC: Boris Ostrovsky <boris.ostrov...@oracle.com>
> CC: Eduardo Valentin <edu...@amazon.com>
> CC: Juergen Gross <jgr...@suse.com>
> CC: Thomas Gleixner <t...@linutronix.de>
> CC: "K. Y. Srinivasan" <k...@microsoft.com>
> CC: Liu Shuo <shuo.a....@intel.com>
> CC: Anoob Soman <anoob.so...@citrix.com>
> Signed-off-by: Amit Shah <a...@amazon.com>
> ---
> drivers/xen/events/events_base.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/xen/events/events_base.c
> b/drivers/xen/events/events_base.c
> index 1ab4bd1..c86d10e 100644
> --- a/drivers/xen/events/events_base.c
> +++ b/drivers/xen/events/events_base.c
> @@ -755,8 +755,10 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct
> msi_desc *msidesc,
> mutex_unlock(&irq_mapping_update_lock);
> return irq;
> error_irq:
> - for (; i >= 0; i--)
> + while (i > 0) {
while (i--)
__unbind_from_irq(irq + i);
Although please see reply to patch 2.
Roger.
