linux-kernel - Re: [PATCH] mmc_core: fix data timeout for SEND_EXT

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Date:	Wed, 11 Feb 2009 15:56:30 +0200
From:	Adrian Hunter <ext-adrian.hunter@...ia.com>
To:	Matt Fleming <matt@...sole-pimps.org>
CC:	Pierre Ossman <drzeus-mmc@...eus.cx>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc_core: fix data timeout for SEND_EXT_CSD

Matt Fleming wrote:
> On Tue, Feb 10, 2009 at 05:40:59PM +0200, Adrian Hunter wrote:
>> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
>> index 9c50e6f..418a270 100644
>> --- a/drivers/mmc/core/mmc_ops.c
>> +++ b/drivers/mmc/core/mmc_ops.c
>> @@ -248,12 +248,16 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
>>
>>       sg_init_one(&sg, data_buf, len);
>>
>> -     /*
>> -      * The spec states that CSR and CID accesses have a timeout
>> -      * of 64 clock cycles.
>> -      */
>> -     data.timeout_ns = 0;
>> -     data.timeout_clks = 64;
>> +     if (!mmc_host_is_spi(card->host) && opcode == MMC_SEND_EXT_CSD)
>> +             mmc_set_data_timeout(&data, card);
>> +     else {
>> +             /*
>> +              * The spec states that CSR and CID accesses have a timeout
>> +              * of 64 clock cycles (8 for SPI).
>> +              */
>> +             data.timeout_ns = 0;
>> +             data.timeout_clks = 64;
>> +     }
>>
>>       mmc_wait_for_req(host, &mrq);
>>
> 
> Doh! You're right, I did inadvertently break this. Your fix looks good.
> 

Actually looking at it now, it seems to have an error, because card may be
NULL in the MMC_SEND_CID case.

Should be 

	if (!mmc_host_is_spi(host) && opcode == MMC_SEND_EXT_CSD)

I will resend.
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