diff options
| author | Stefano Stabellini | 2012-05-21 17:54:10 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk | 2012-05-21 20:11:36 +0200 |
| commit | 68c2c39a76b094e9b2773e5846424ea674bf2c46 (patch) | |
| tree | b3959303806a6228adbbab234c474e16c81738ba /arch/x86/xen/xen-ops.h | |
| parent | hvc_xen: NULL dereference on allocation failure (diff) | |
| download | kernel-qcow2-linux-68c2c39a76b094e9b2773e5846424ea674bf2c46.tar.gz kernel-qcow2-linux-68c2c39a76b094e9b2773e5846424ea674bf2c46.tar.xz kernel-qcow2-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/xen/xen-ops.h')
0 files changed, 0 insertions, 0 deletions