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

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Message-ID: <fb58e2c8-ffc4-dc5d-9625-6170f3fe7195@oracle.com>
Date:   Thu, 6 Sep 2018 15:41:22 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        xen-devel@...ts.xenproject.org
Cc:     linux-kernel@...r.kernel.org, Juergen Gross <jgross@...e.com>,
        Wei Liu <wei.liu2@...rix.com>
Subject: Re: [PATCH] xen/manage: don't complain about an empty value in
 control/sysrq node

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@...hat.com>
>


Applied to for-linus-19b.

-boris