linux-kernel - Re: [patch 1/7] libata: check for AN support

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Message-ID: <20070424090713.65657495@the-village.bc.nu>
Date:	Tue, 24 Apr 2007 09:07:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	jeff@...zik.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	htejun@...il.com,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Subject: Re: [patch 1/7] libata: check for AN support

> +		/*
> +		 * check to see if this ATAPI device supports
> +		 * Asynchronous Notification
> +		 */
> +		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_AN(id))
> +		{

Bracketing police ^^^

> +			/* issue SET feature command to turn this on */
> +			rc = ata_dev_set_AN(dev);
> +			if (rc) {
> +				ata_dev_printk(dev, KERN_ERR,
> +						"unable to set AN\n");
> +				rc = -EINVAL;
> +				goto err_out_nosup;

How fatal is this - do we need to ignore the device at this point or
should we just pretend (possibly correctly) that the device itself does
not support notification. 

> @@ -299,6 +305,8 @@ struct ata_taskfile {
>  #define ata_id_queue_depth(id)	(((id)[75] & 0x1f) + 1)
>  #define ata_id_removeable(id)	((id)[0] & (1 << 7))
>  #define ata_id_has_dword_io(id)	((id)[50] & (1 << 0))
> +#define ata_id_has_AN(id)	\
> +	((id[76] && (~id[76])) & ((id)[78] & (1 << 5)))

Might be nice to check ATA version as well to be paranoid but this all
looks ok as its a reserved field since way back when.

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