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SubjectRe: [PATCH] xen/manage: don't complain about an empty value in control/sysrq node
On Thu, Sep 06, 2018 at 01:26:08PM +0200, Vitaly Kuznetsov wrote:
> When guest receives a sysrq request from the host it acknowledges it by
> writing '\0' to control/sysrq xenstore node. This, however, make xenstore
> watch fire again but xenbus_scanf() fails to parse empty value with "%c"
> format string:
>
> sysrq: SysRq : Emergency Sync
> Emergency Sync complete
> xen:manage: Error -34 reading sysrq code in control/sysrq
>
> Ignore -ERANGE the same way we already ignore -ENOENT, empty value in
> control/sysrq is totally legal.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>

Reviewed-by: Wei Liu <wei.liu2@citrix.com>

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