xen/events: fix error code in xen_bind_pirq_msi_to_irq()

commit 7f3da4b698bcc21a6df0e7f114af71d53a3e26ac upstream.

Return -ENOMEM if xen_irq_init() fails.  currently the code returns an
uninitialized variable or zero.

Fixes: 5dd9ad32d775 ("xen/events: drop xen_allocate_irqs_dynamic()")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Juergen Gross <jgross@ssue.com>
Link: https://lore.kernel.org/r/3b9ab040-a92e-4e35-b687-3a95890a9ace@moroto.mountain
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 36ba3ef6ef01edef9a8017e88e0902fe8e2f339e..0c5259c68adeb00b0934528c78668c4b60adee85 100644 (file)
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1099,8 +1099,10 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 
        for (i = 0; i < nvec; i++) {
                info = xen_irq_init(irq + i);
-               if (!info)
+               if (!info) {
+                       ret = -ENOMEM;
                        goto error_irq;
+               }
 
                irq_set_chip_and_handler_name(irq + i, &xen_pirq_chip, handle_edge_irq, name);