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arm/xen: Correctly check if the event channel interrupt is present

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The function irq_of_parse_and_map returns 0 when the IRQ is not found.

Futhermore, move the check before notifying the user that we are running on
Xen.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
This commit is contained in:
Julien Grall 2015-05-06 14:09:06 +00:00 committed by David Vrabel
parent ba155e2d21
commit 81e863c3a2
1 changed files with 6 additions and 4 deletions
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arch/arm/xen/enlighten.c
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@ -51,7 +51,7 @@ EXPORT_SYMBOL_GPL(xen_have_vector_callback);
int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
static __read_mostly int xen_events_irq = -1;
static __read_mostly unsigned int xen_events_irq;
int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
unsigned long addr,
@ -179,12 +179,14 @@ static int __init xen_guest_init(void)
return 0;
grant_frames = res.start;
xen_events_irq = irq_of_parse_and_map(node, 0);
if (!xen_events_irq) {
pr_debug("Xen event channel interrupt not found\n");
return -ENODEV;
}
pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
version, xen_events_irq, &grant_frames);
if (xen_events_irq < 0)
return -ENODEV;
xen_domain_type = XEN_HVM_DOMAIN;
xen_setup_features();