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From: Tejun Heo <tj@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jeff Garzik <jeff@garzik.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-ide@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [git patches] libata fixes for .26
Date: Sat, 05 Jul 2008 12:18:28 +0900	[thread overview]
Message-ID: <486EE804.6020202@kernel.org> (raw)
In-Reply-To: <486EE6CA.2040908@kernel.org>

Tejun Heo wrote:
> so, it basically behaves like level triggered IRQ latch for ports,
> which also creates an easy-to-miss requirement for MSI implementation
> where the controller should generate a new MSI message when the driver
> clears some of the IRQ pending bits but not all.

Oops, confused.  The easy-to-miss requirement is the controller needing
to resend the message if the irq_stat is cleared but port IRQ is still
pending.  Resending on partial clear is always necessary.

Thanks.

-- 
tejun

  reply	other threads:[~2008-07-05  3:18 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-04 13:10 [git patches] libata fixes for .26 Jeff Garzik
2008-07-04 17:09 ` Linus Torvalds
2008-07-05  3:13   ` Tejun Heo
2008-07-05  3:18     ` Tejun Heo [this message]
2008-07-05  4:10       ` [PATCH #upstream-fixes] ahci: give another shot at clearing all bits in irq_stat Tejun Heo
2008-07-06 13:45         ` Jeff Garzik
  -- strict thread matches above, loose matches on Subject: below --
2008-07-11 14:10 [git patches] libata fixes for .26 Jeff Garzik

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