linux-kernel - Re: [PATCH v2] ata: New PATA driver for Altera CompactFlash.

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Message-ID: <20091008141241.550a09bd@lxorguk.ukuu.org.uk>
Date:	Thu, 8 Oct 2009 14:12:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ian Abbott <abbotti@....co.uk>
Cc:	Thomas Chou <thomas@...ron.com.tw>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Nios2 development list <nios2-dev@...c.et.ntust.edu.tw>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Abbott <ian.abbott@....co.uk>
Subject: Re: [PATCH v2] ata: New PATA driver for Altera CompactFlash.

On Thu, 8 Oct 2009 12:22:22 +0100
Ian Abbott <abbotti@....co.uk> wrote:

> On 08/10/09 10:55, Alan Cox wrote:
> > On Thu,  8 Oct 2009 09:58:30 +0800
> > Thomas Chou <thomas@...ron.com.tw> wrote:
> > 
> >> This patch adds a new PATA driver to support the Altera SOPC Builder
> >> CompactFlash component as a PATA device with support for insertion
> >> and removal of CF cards.  It uses the platform driver model.
> > 
> > Can you explain why you remove the interface rather than the device on
> > the interface when you detect a card removal ?
> 
> As the originator of the driver, the only answer I have is "I don't know
> how."  I was hoping for inspiration from some of the other PATA CF
> drivers, but alas, I couldn't find it.  I admit that removing the whole
> ATA host is a bit on the extreme side.

I think the bit you want is something like:

	struct ata_eh_info *ehi = &ap->link->eh_info;
	if (mumblemumble & whatever) {
		ata_ehi_clear_desc(ehi);
		ata_ehi_hotplugged(ehi);
		ata_ehi_push_desc(ehi, "CF connection changed");
		ata_port_freeze(ap);
	}

The core code also assumes your freeze method will mask any further
connection change reports until the port is unfrozen (so you don't get
multiple parallel "in/out/in/out" events at once)

Alan
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