Re: [PATCH] xen/manage: don't complain about an empty value in control/sysrq node

[Boris Ostrovsky]

On 09/06/2018 07:26 AM, 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@xxxxxxxxxx>
>


Applied to for-linus-19b.

-boris