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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2012-05-21 16:54:10 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-05-21 14:11:36 -0400 |
| commit | 68c2c39a76b094e9b2773e5846424ea674bf2c46 (patch) | |
| tree | b3959303806a6228adbbab234c474e16c81738ba /arch/x86/pci/xen.c | |
| parent | 201a52bea928687b7557728b176ac4f8a37d5cbd (diff) | |
| download | linux-68c2c39a76b094e9b2773e5846424ea674bf2c46.tar.gz linux-68c2c39a76b094e9b2773e5846424ea674bf2c46.tar.bz2 linux-68c2c39a76b094e9b2773e5846424ea674bf2c46.zip | |
xen: do not map the same GSI twice in PVHVM guests.
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.
CC: stable@kernel.org
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/pci/xen.c')
| -rw-r--r-- | arch/x86/pci/xen.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index 7415aa927913..56ab74989cf1 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -64,6 +64,10 @@ static int xen_register_pirq(u32 gsi, int gsi_override, int triggering, int shareable = 0; char *name; + irq = xen_irq_from_gsi(gsi); + if (irq > 0) + return irq; + if (set_pirq) pirq = gsi; |