linux-kernel - Re: [patch 7/7] libata: send event when AN received

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Message-ID: <20070424090910.1d145c24@the-village.bc.nu>
Date:	Tue, 24 Apr 2007 09:09:10 +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 7/7] libata: send event when AN received

> +		/* check the 'N' bit in word 0 of the FIS */
> +		if (f[0] & (1 << 15)) {
> +			int port_addr =  ((f[0] & 0x00000f00) >> 8);
> +			struct ata_device *adev = &ap->device[port_addr];

You can't be sure that the port_addr returned will be in range if a
device is malfunctioning...

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