linux-kernel - Re: [PATCH v4] serial: 8250_dw: fix wrong logic in dw8250_check

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Date:	Thu, 7 Apr 2016 16:33:34 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Noam Camus <noamc@...hip.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<guohanjun@...wei.com>, <xuwei5@...ilicon.com>
Subject: Re: [PATCH v4] serial: 8250_dw: fix wrong logic in dw8250_check_lcr()



On 2016/4/5 18:50, Andy Shevchenko wrote:
> On Tue, 2016-04-05 at 13:53 +0800, Kefeng Wang wrote:
>> Commit cdcea058e510 ("serial: 8250_dw: Avoid serial_outx code
>> duplicate
>> with new dw8250_check_lcr()") introduce a wrong logic when write val
>> to
>> LCR reg. When CONFIG_64BIT enabled, __raw_writeq is used
>> unconditionally.
>>
>> The __raw_readq/__raw_writeq is introduced by commit bca2092d7897
>> ("serial:
>> 8250_dw: Use 64-bit access for OCTEON.") for OCTEON, so for
>> !PORT_OCTEON,
>> we better to use coincident write func.
>>
>> Fixes: cdcea058e510("serial: 8250_dw: Avoid serial_outx code
>> duplicate with new dw8250_check_lcr()")
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> ---
>>
>> Changes since v3:
>> - Add patch change log, suggested by Greg Kroah-Hartman.
>> Changes since v2:
>> - Add #ifdef CONFIG_64BIT back, ensure it can be built under 
> 
> Oh, true. Since it's a native IO we can't use writeq() helper from io-
> 64-nonatomic-*. 
> 
>> configuration lacking readq/writeq.
>> Changes since v1:
>> - Repace '#ifdef CONFIG_64BIT' with IS_ENABLED(CONFIG_64BIT).
>> - Enrich patch log, and add Fixes tag.
[...]
> 
> So, this changes logic to write the value on any 64 platform, using
> different (non-64-bit) accessors, so, the case to fix is
> actually "64BIT && !PORT_OCTEON". Perhaps commit message should be
> amended to point that clearly.

Yes, it's more clear. thanks for review and point it out.

To Greg, should I resend it or can you help me to change the patch log when you merge it. Thanks.