From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Tejun Heo <htejun@gmail.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Jens Axboe <jens.axboe@oracle.com>,
linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: Prevent busy looping
Date: Wed, 11 Jun 2008 08:05:02 +0100 [thread overview]
Message-ID: <20080611080502.4aa43980@core> (raw)
In-Reply-To: <484F7A8D.1040809@gmail.com>
> Elias's synthetic test case triggered infinite loop because it wasn't
> a proper ->qc_defer(). ->qc_defer() should never defer commands when
> the target is idle.
Target or host ? We *do* defer commands in the case of an idle channel
when dealing with certain simplex controllers that can only issue one
command per host not one per cable (and in fact in the general case we
can defer commands due to activity on the other drive on the cable).
Alan
next prev parent reply other threads:[~2008-06-11 7:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080416151305.8788.63912.stgit@denkblock.local>
[not found] ` <20080416163152.GK12774@kernel.dk>
[not found] ` <87r6d5l9pb.fsf@denkblock.local>
[not found] ` <20080417071335.GR12774@kernel.dk>
2008-04-17 8:50 ` Prevent busy looping Elias Oltmanns
2008-06-11 7:11 ` Tejun Heo
2008-06-11 7:05 ` Alan Cox [this message]
2008-06-11 8:03 ` Tejun Heo
2008-06-12 3:06 ` Tejun Heo
2008-06-12 11:32 ` Elias Oltmanns
2008-06-12 13:43 ` Tejun Heo
2008-06-12 14:18 ` James Bottomley
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