linux-kernel - Re: [patch 2/4] sdio: set the functions' block size

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Message-ID: <46B8A9DA.9030804@csr.com>
Date:	Tue, 07 Aug 2007 18:20:26 +0100
From:	David Vrabel <david.vrabel@....com>
To:	Pierre Ossman <drzeus-list@...eus.cx>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/4] sdio: set the functions' block size

Pierre Ossman wrote:
> On Tue, 07 Aug 2007 13:54:32 +0100
> David Vrabel <david.vrabel@....com> wrote:
> 
>>  
>> Index: mmc/drivers/mmc/core/sdio.c
>> ===================================================================
>> --- mmc.orig/drivers/mmc/core/sdio.c	2007-08-07
>> 00:38:33.000000000 +0100 +++ mmc/drivers/mmc/core/sdio.c
>> 2007-08-07 07:17:29.000000000 +0100 @@ -53,6 +53,7 @@
>>  {
>>  	int ret;
>>  	struct sdio_func *func;
>> +	unsigned block_size;
>>  
>>  	BUG_ON(fn > SDIO_MAX_FUNCS);
>>  
>> @@ -70,6 +71,15 @@
>>  	if (ret)
>>  		goto fail;
>>  
>> +	/*
>> +	 * Set the function's block size to the largest supported by
>> +	 * both the function and the host.
>> +	 */
>> +	block_size = min(func->max_blksize,
>> func->card->host->max_blk_size);
>> +	ret = sdio_set_block_size(func, block_size);
>> +	if (ret)
>> +		goto fail;
>> +
>>  	card->sdio_func[fn - 1] = func;
>>  
>>  	return 0;
> 
> This is probably better done in the sdio_enable_func().

I don't think so. A driver might enable/disable a function multiple
times but there's no need to set the block size every time.

It may be best to move setting the block size back to before the probe
so a driver can be sure the block size is something sensible.  Consider
a failed probe that called sdio_set_block_size() -- this will currently
mess up drivers probed later.

David
-- 
David Vrabel, Software Engineer, Drivers group  Tel: +44 (0)1223 692562
CSR plc, Churchill House, Cambridge Business Park, Cowley Road, CB4 0WZ

.
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