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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2012-05-21 16:54:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-01 15:18:25 +0800 |
| commit | 474d1f4678a679a98eaf53801e7f95c61ae9daa7 (patch) | |
| tree | 55949e1184861437b1d4c6a3cb5cd8ab89f29034 /drivers/xen | |
| parent | 284e7be895509cdaf9f58e2f789c00b5e9da2244 (diff) | |
| download | linux-3.10-474d1f4678a679a98eaf53801e7f95c61ae9daa7.tar.gz linux-3.10-474d1f4678a679a98eaf53801e7f95c61ae9daa7.tar.bz2 linux-3.10-474d1f4678a679a98eaf53801e7f95c61ae9daa7.zip | |
xen: do not map the same GSI twice in PVHVM guests.
commit 68c2c39a76b094e9b2773e5846424ea674bf2c46 upstream.
PV on HVM guests map GSIs into event channels. At restore time the
event channels are resumed by restore_pirqs.
Device drivers might try to register the same GSI again through ACPI at
restore time, but the GSI has already been mapped and bound by
restore_pirqs. This patch detects these situations and avoids
mapping the same GSI multiple times.
Without this patch we get:
(XEN) irq.c:2235: dom4: pirq 23 or emuirq 28 already mapped
and waste a pirq.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/events.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 0a8a17cd80b..6908e4ce2a0 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -611,7 +611,7 @@ static void disable_pirq(struct irq_data *data) disable_dynirq(data); } -static int find_irq_by_gsi(unsigned gsi) +int xen_irq_from_gsi(unsigned gsi) { struct irq_info *info; @@ -625,6 +625,7 @@ static int find_irq_by_gsi(unsigned gsi) return -1; } +EXPORT_SYMBOL_GPL(xen_irq_from_gsi); /* * Do not make any assumptions regarding the relationship between the @@ -644,7 +645,7 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi, mutex_lock(&irq_mapping_update_lock); - irq = find_irq_by_gsi(gsi); + irq = xen_irq_from_gsi(gsi); if (irq != -1) { printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n", irq, gsi); |