linux-kernel - Re: 2.6.29-rc libata sff 32bit PIO regression

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Message-ID: <498482ED.9090800@ru.mvista.com>
Date:	Sat, 31 Jan 2009 19:57:17 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Hugh Dickins <hugh@...itas.com>, Jeff Garzik <jgarzik@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29-rc libata sff 32bit PIO regression

Hello.

Alan Cox wrote:

>>> +	if (pdev->device == PCI_DEVICE_ID_AMD_VIPER_7411) /* FIFO is broken */
>>> +		fifo = 0;
>>> +
>>> +	/* On the later chips the read prefetch bits become no-op bits */
>>> +	pci_read_config_byte(pdev, 0x41, &r);
>>> +	r &= ~fifobit[ap->port_no];
>>>   
>>>       
>>   Why not:
>>
>>        r &= ~fifo;
>>     
>
> Because then it wouldn't clear the bits if they were set already and we
> wanted them off!
>   

   Ah, missed the modification of 'fifo'... :-<

MBR, Sergei


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