linux-kernel - Re: [PATCH 2.6.19 3/3] sata

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Date:	Wed, 6 Dec 2006 09:51:07 +0100 (MET)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	htejun@...il.com, mikpe@...uu.se
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.19 3/3] sata_promise: cleanups

On Sun, 03 Dec 2006 22:05:51 +0900, Tejun Heo wrote:
>Mikael Pettersson wrote:
>> This patch performs two simple cleanups of sata_promise.
>> 
>> * Remove board_20771 and map device id 0x3577 to board_2057x.
>>   After the recent corrections for SATAII chips, board_20771 and
>>   board_2057x were equivalent in the driver.
>
>Ack.
>
>> * Remove hp->hotplug_offset and use hp->flags & PDC_FLAG_GEN_II
>>   to compute hotplug_offset in pdc_host_init().
>
>Please explain why.

hp->hotplug_offset was used to allow pdc_host_init() to work for both
1st and 2nd generation chips. However, more tests were needed to
properly handle other aspects of 2nd generation chips, so hp->flags
and PDC_FLAG_GEN_II were introduced. Now hp->hotplug_offset is redundant
since its value is derivable from hp->flags & PDC_FLAG_GEN_II.

>
>> @@ -704,7 +684,7 @@ static void pdc_host_init(unsigned int c
>>  {
>>  	void __iomem *mmio = pe->mmio_base;
>>  	struct pdc_host_priv *hp = pe->private_data;
>> -	int hotplug_offset = hp->hotplug_offset;
>> +	int hotplug_offset = (hp->flags & PDC_FLAG_GEN_II) ? PDC2_SATA_PLUG_CSR : PDC_SATA_PLUG_CSR;
>
>People tend to prefer explicit if () over ?: and dislike lines much
>longer than 80 column, well, at least in libata.

OK, I'll replace the ?: with an if-statement.

/Mikael
-
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