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Re: [Qemu-devel] [PATCH 4/6] Always notify consumers of char devices if

From: Amit Shah
Subject: Re: [Qemu-devel] [PATCH 4/6] Always notify consumers of char devices if they're open
Date: Mon, 5 Apr 2010 09:13:38 +0530
User-agent: Mutt/1.5.19 (2009-01-05)

On (Thu) Apr 01 2010 [18:42:39], Alexander Graf wrote:
> When using virtio-console on s390, the input doesn't work.
> The root of the problem is rather simple. What happens is the following:
>  1) create character device for stdio
>  2) char device is done creating, sends OPENED event
>  3) virtio-console adds handlers
>  4) no event comes because the char device is open already
>  5) virtio-console doesn't accept input because it didn't
>     receive an OPENED event
> To make that sure virtio-console gets notified that the character device
> is open even when it's been open from the beginning, this patch introduces
> a variable that keeps track of the opened state. If the device is open when
> the event handlers get installed, we just notify the handler.
> This fixes input with virtio-console on s390.
> Signed-off-by: Alexander Graf <address@hidden>

Acked-by: Amit Shah <address@hidden>


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