linux-kernel - Re: [PATCH] Move the judgement of timeout into mmc_switch_status

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Date:	Thu, 24 Dec 2015 19:15:20 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	장영진 <yj84.jang@...sung.com>,
	ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	js07.lee@...sung.com,
	'이광호' <demon.lee@...sung.com>
Subject: Re: [PATCH] Move the judgement of timeout into
 mmc_switch_status_error()

Hi,

NAK.

Maybe..It seems that this is not the patch based on latest kernel..
Which kernel version did you use? Plz, check the latest kernel.

Best Regards,
Jaehoon Chung

On 12/24/2015 06:24 PM, Jaehoon Chung wrote:
> Hi,
> 
> Before send the patch at mailing list, you need to make the patch as mainline style.
> Maybe..maintainer should not review this patch.
> 
> Refer to "Linux kernel coding style" and "submitting Patches".
> Also set  your email environment. (Documentation/email-clients.txt)
> 
> Best Regards,
> Jaehoon Chung
> 
> On 12/24/2015 06:13 PM, 장영진 wrote:
>> >From bc1e491b29d9199f16c6e002a69f9377677b93af Mon Sep 17 00:00:00 2001
>>
>> From: "yj84.jang" <yj84.jang@...sung.com>
>>
>> Date: Wed, 16 Dec 2015 08:52:47 +0900
>>
>> Subject: [PATCH] Move the judgement of timeout into
>> mmc_switch_status_error()
>>
>>  
>>
>> __mmc_switch() is possible to misjudge error.
>>
>>  
>>
>> Although jiffies was overed timeout, 
>>
>> the chance about "R1_CURRENT_STATE(status) != R1_STATE_PRG" is exists. 
>>
>> In other words, Successful completion of CMD6 with timeout error.
>>
>>  
>>
>> Kernel expects failure of __mmc_switch,
>>
>> but card is completed CMD6 in this case.
>>
>> It makes mismatch status between mmc subsystem and mmc card.
>>
>>  
>>
>> Especially, in case of partition switch,
>>
>> If timeout occurs with normal status of CMD13 response unfortunatley, 
>>
>> "main_md->curr" will not be set, even card switched successfully.
>>
>>  
>>
>> Checking state of mmc card is needed when judging an timeout error, 
>>
>> if it is just timeout or timeout with error.
>>
>>  
>>
>> Signed-off-by: yj84.jang <yj84.jang@...sung.com>
>>
>> ---
>>
>> drivers/mmc/core/mmc_ops.c |    5 +++--
>>
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>
>>  
>>
>> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
>>
>> index 1f44426..033f475 100644
>>
>> --- a/drivers/mmc/core/mmc_ops.c
>>
>> +++ b/drivers/mmc/core/mmc_ops.c
>>
>> @@ -456,6 +456,8 @@ int mmc_switch_status_error(struct mmc_host *host, u32
>> status)
>>
>>                     if (status & R1_SPI_ILLEGAL_COMMAND)
>>
>>                                return -EBADMSG;
>>
>>          } else {
>>
>> +                   if (R1_CURRENT_STATE(status) == R1_STATE_PRG)
>>
>> +                              return -ETIMEDOUT;
>>
>>                     if (status & 0xFDFFA000)
>>
>>                                pr_warn("%s: unexpected status %#x after
>> switch\n",
>>
>>                                          mmc_hostname(host), status);
>>
>> @@ -568,8 +570,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8
>> index, u8 value,
>>
>>                     if (time_after(jiffies, timeout)) {
>>
>>                                pr_err("%s: Card stuck in programming state!
>> %s\n",
>>
>>                                          mmc_hostname(host), __func__);
>>
>> -                               err = -ETIMEDOUT;
>>
>> -                               goto out;
>>
>> +                              break;
>>
>>                     }
>>
>>          } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
>>
>>  
>>
> 
> --
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> 

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