linux-kernel - Re: [PATCH] hvc_console: returning 0 from put

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <200910152126.28024.borntraeger@de.ibm.com>
Date:	Thu, 15 Oct 2009 21:26:27 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Timur Tabi <timur@...escale.com>, linuxppc-dev@...abs.org,
	brueckner@...ux.vnet.ibm.com, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hvc_console: returning 0 from put_chars is not an error

Am Donnerstag 15 Oktober 2009 20:57:45 schrieb Scott Wood:
> Doing it in the backend requires the backend to know whether it's being
> called for printk or for user I/O.  In the latter case, we don't want to
> spin, but rather wait for an IRQ (or poll with a timer if there's no IRQ).

Right. Now you have me convinced that we really should have some logic in 
hvc_console because, its the only place that knows if it came from printk or 
user.

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). 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/