linux-kernel - Re: MMC: logical-bitwise and confusion in tifm_sd_transfer

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Date:	Tue, 11 Mar 2008 00:40:54 -0700 (PDT)
From:	Alex Dubov <oakad@...oo.com>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
Cc:	lkml <linux-kernel@...r.kernel.org>, Roel Kluin <12o3l@...cali.nl>
Subject: Re: MMC: logical-bitwise and confusion in  tifm_sd_transfer_data()?


--- Pierre Ossman <drzeus-mmc@...eus.cx> wrote:

> On Sun, 09 Mar 2008 21:31:08 +0100
> Roel Kluin <12o3l@...cali.nl> wrote:
> 
> > from drivers/mmc/host/tifm_sd.c:183:
> > 
> > if ((r_data->flags & MMC_DATA_WRITE)
> >     && DATA_CARRY)
> > 
> > shouldn't this be bit-wise &?
> 
> First off, I'm not the maintainer of that driver, Alex Dubov is.
> 
> Second, the code seems broken, but not in the way you suggest. It should probably have been:
> 
> if ((r_data->flags & MMC_DATA_WRITE)
> 	&& (host->cmd_flags & DATA_CARRY))
> 

Yes, this is the intended meaning. Can you fix it yourself or should I send a separate patch?



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