From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@ozlabs.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
brueckner@linux.vnet.ibm.com, Timur Tabi <timur@freescale.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] hvc_console: returning 0 from put_chars is not an error
Date: Fri, 16 Oct 2009 10:49:24 +0200 [thread overview]
Message-ID: <20091016084924.GB4234@linux.vnet.ibm.com> (raw)
In-Reply-To: <4AD778E6.7020806@freescale.com>
On Thu, Oct 15, 2009 at 02:32:54PM -0500, Scott Wood wrote:
> Christian Borntraeger wrote:
>> About the backends, there are some that spin until the text is
>> delivered (e.g. virtio) , others can drop (e.g. iucv is a connection
>> oriented protocol and it will (and has to) drop if there is no
>> connection).
>
> Sure, dropping due to not having a connection makes sense. That's
> different from merely being busy. Can the iucv code tell the difference
> between those two states?
The states are handled by the hvc_iucv itself:
If the hvc_iucv code has a connection established, terminal or console data
are queued and sent to the peer. If the state is disconnected, terminal and
console data is discarded internally.
- Hendrik
WARNING: multiple messages have this Message-ID (diff)
From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
To: Scott Wood <scottwood@freescale.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
linuxppc-dev@ozlabs.org, brueckner@linux.vnet.ibm.com,
Timur Tabi <timur@freescale.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] hvc_console: returning 0 from put_chars is not an error
Date: Fri, 16 Oct 2009 10:49:24 +0200 [thread overview]
Message-ID: <20091016084924.GB4234@linux.vnet.ibm.com> (raw)
In-Reply-To: <4AD778E6.7020806@freescale.com>
On Thu, Oct 15, 2009 at 02:32:54PM -0500, Scott Wood wrote:
> Christian Borntraeger wrote:
>> About the backends, there are some that spin until the text is
>> delivered (e.g. virtio) , others can drop (e.g. iucv is a connection
>> oriented protocol and it will (and has to) drop if there is no
>> connection).
>
> Sure, dropping due to not having a connection makes sense. That's
> different from merely being busy. Can the iucv code tell the difference
> between those two states?
The states are handled by the hvc_iucv itself:
If the hvc_iucv code has a connection established, terminal or console data
are queued and sent to the peer. If the state is disconnected, terminal and
console data is discarded internally.
- Hendrik
next prev parent reply other threads:[~2009-10-16 8:49 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-14 21:53 [PATCH] hvc_console: returning 0 from put_chars is not an error Timur Tabi
2009-10-15 11:05 ` Christian Borntraeger
2009-10-15 11:05 ` Christian Borntraeger
2009-10-15 16:09 ` Scott Wood
2009-10-15 16:09 ` Scott Wood
2009-10-15 18:41 ` Christian Borntraeger
2009-10-15 18:41 ` Christian Borntraeger
2009-10-15 18:55 ` Timur Tabi
2009-10-15 18:55 ` Timur Tabi
2009-10-15 18:57 ` Scott Wood
2009-10-15 18:57 ` Scott Wood
2009-10-15 19:26 ` Christian Borntraeger
2009-10-15 19:26 ` Christian Borntraeger
2009-10-15 19:32 ` Scott Wood
2009-10-16 8:49 ` Hendrik Brueckner [this message]
2009-10-16 8:49 ` Hendrik Brueckner
2009-10-17 23:17 ` Timur Tabi
2009-10-16 4:46 ` Benjamin Herrenschmidt
2009-10-16 4:46 ` Benjamin Herrenschmidt
2009-10-16 15:33 ` Scott Wood
2009-10-16 15:33 ` Scott Wood
2009-10-16 18:03 ` Benjamin Herrenschmidt
2009-10-16 18:03 ` Benjamin Herrenschmidt
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