[libvirt PATCH 2/2] qemu: preserve error on bandwidth rollback
We call APIs that reset the error in the rollback code.
Preserve the error from the original call that failed.
This turns the boringly cryptic:
error: Unable to set interface parameters
error: An error occurred, but the cause is unknown
to the unexpectedly anarchist:
error: internal error: Child process (/usr/sbin/tc filter add
dev vnet1 parent ffff: protocol all u32 match u32 0 0 police
rate 4294968kbps burst 4294968kb mtu 64kb drop flowid :1)
unexpected exit status 1: Illegal "rate"
Illegal "police"
Signed-off-by: Ján Tomko <jtomko(a)redhat.com>
Fixes: f02e21cb3379a41cd42f2d8116f2d10dabace83b
https://bugzilla.redhat.com/show_bug.cgi?id=1800505
---
src/qemu/qemu_driver.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 0324c771a5..ad5c7d9ff1 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -11661,6 +11661,9 @@ qemuDomainSetInterfaceParameters(virDomainPtr dom,
if (virNetDevBandwidthSet(net->ifname, newBandwidth, false,
!virDomainNetTypeSharesHostView(net)) < 0) {
+ virErrorPtr orig_err;
+
+ virErrorPreserveLast(&orig_err);
ignore_value(virNetDevBandwidthSet(net->ifname,
net->bandwidth,
false,
@@ -11669,6 +11672,7 @@ qemuDomainSetInterfaceParameters(virDomainPtr dom,
ignore_value(virDomainNetBandwidthUpdate(net,
net->bandwidth));
}
+ virErrorRestore(&orig_err);
goto endjob;
}
--
2.21.1