From: Tejun Heo <htejun@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: jgarzik@pobox.com, axboe@suse.de, albertcc@tw.ibm.com,
forrest.zhao@intel.com, efalk@google.com,
linux-ide@vger.kernel.org
Subject: Re: [PATCH 08/11] sata_sil: convert to new EH
Date: Fri, 12 May 2006 00:45:45 +0900 [thread overview]
Message-ID: <44635C29.6080903@gmail.com> (raw)
In-Reply-To: <1147362385.26130.42.camel@localhost.localdomain>
Alan Cox wrote:
> On Iau, 2006-05-11 at 23:39 +0900, Tejun Heo wrote:
>> I'm not sure what you mean by synchronization. But, freezing is indeed
>> for shutting the chip up. If the port is frozen, EH doesn't touch
>> active qcs nor tries to issue new command. The port is thawed/used only
>> after the port & device are put into known good state via successful
>> reset. Is this what you're talking about?
>
> Sort of. I wanted to point out that this can occur
>
> IRQ is issued on chip
>
> ->freeze
> returns
>
> ->intr finally arrives and is serviced
I see. As far as EH is concerned, this should be okay. Once qc
ownership is transferred, irq handler cannot access the qc
(ata_qc_from_tag() prevents it) and has no way other than handling it as
a spurious interrupt or HSM violation. But, it sounds like it could
result in screaming IRQ for controllers without IRQ pending bit. Could
it? If so, maybe unconditional irq clearing in ata_interrupt() should
be resurrected to handle such conditions.
--
tejun
next prev parent reply other threads:[~2006-05-11 15:45 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-11 13:21 [PATCHSET 03/11] new EH implementation, take 3 Tejun Heo
2006-05-11 13:21 ` [PATCH 04/11] libata-eh: implement ata_eh_info and ata_eh_context Tejun Heo
2006-05-11 13:21 ` [PATCH 05/11] libata-eh: implement new EH Tejun Heo
2006-05-13 22:19 ` Jeff Garzik
2006-05-11 13:21 ` [PATCH 01/11] libata-eh: add ATA and libata flags for " Tejun Heo
2006-05-13 22:15 ` Jeff Garzik
2006-05-11 13:21 ` [PATCH 02/11] libata-eh: implement ata_ering Tejun Heo
2006-05-13 22:16 ` Jeff Garzik
2006-05-13 23:36 ` Tejun Heo
2006-05-14 1:05 ` Jeff Garzik
2006-05-14 1:20 ` Tejun Heo
2006-05-14 1:32 ` Jeff Garzik
2006-05-14 1:38 ` Tejun Heo
2006-05-15 13:36 ` Alan Cox
2006-05-15 14:00 ` Tejun Heo
2006-05-15 14:25 ` Tejun Heo
2006-05-15 14:50 ` Alan Cox
2006-05-15 14:57 ` Tejun Heo
2006-05-15 15:19 ` Alan Cox
2006-05-15 15:19 ` Tejun Heo
2006-05-15 18:22 ` Jeff Garzik
2006-05-11 13:21 ` [PATCH 03/11] libata-eh: add per-dev ata_ering Tejun Heo
2006-05-11 13:21 ` [PATCH 06/11] libata-eh: implement BMDMA EH Tejun Heo
2006-05-13 22:21 ` Jeff Garzik
2006-05-13 23:41 ` Tejun Heo
2006-05-15 13:38 ` Alan Cox
2006-05-15 13:59 ` Tejun Heo
2006-05-15 14:43 ` Alan Cox
2006-05-11 13:21 ` [PATCH 07/11] ata_piix: convert to new EH Tejun Heo
2006-05-13 22:23 ` Jeff Garzik
2006-05-11 13:21 ` [PATCH 08/11] sata_sil: " Tejun Heo
2006-05-11 14:22 ` Alan Cox
2006-05-11 14:39 ` Tejun Heo
2006-05-11 15:46 ` Alan Cox
2006-05-11 15:45 ` Tejun Heo [this message]
2006-05-11 16:12 ` Alan Cox
2006-05-11 16:10 ` Tejun Heo
2006-05-11 17:16 ` Alan Cox
2006-05-13 22:26 ` Jeff Garzik
2006-05-13 23:43 ` Tejun Heo
2006-05-11 13:21 ` [PATCH 10/11] ahci: add PIOS interim interrupt handling Tejun Heo
2006-05-11 13:21 ` [PATCH 09/11] ahci: convert to new EH Tejun Heo
2006-05-13 10:53 ` Tejun Heo
2006-05-13 22:30 ` Jeff Garzik
2006-05-13 23:49 ` Tejun Heo
2006-05-11 13:21 ` [PATCH 11/11] sata_sil24: " Tejun Heo
2006-05-13 22:34 ` [PATCHSET 03/11] new EH implementation, take 3 Jeff Garzik
2006-05-13 23:58 ` Tejun Heo
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