From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Likely Subject: Re: [PATCH V2] spi: remove check for bits_per_word on transfer from low level driver Date: Wed, 19 Dec 2012 16:24:33 +0000 Message-ID: <20121219162433.1E1E43E0BCF@localhost> References: <1355820943-25228-1-git-send-email-ldewangan@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1355820943-25228-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org Cc: linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jonas.gorski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kgene.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, Laxman Dewangan , ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org, baohua.song-kQvG35nSl+M@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: linux-tegra@vger.kernel.org On Tue, 18 Dec 2012 14:25:43 +0530, Laxman Dewangan wrote: > The spi core make sure that each transfer structure have the proper > setting for bits_per_word before calling low level transfer APIs. > > Hence it is no more require to check again in low level driver for > this field whether this is set correct or not. Removing such code > from low level driver. > > Signed-off-by: Laxman Dewangan [...] > diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c > index d5a3cbb..550b5f4 100644 > --- a/drivers/spi/spi-txx9.c > +++ b/drivers/spi/spi-txx9.c > @@ -189,9 +189,8 @@ static void txx9spi_work_one(struct txx9spi *c, struct spi_message *m) > unsigned int len = t->len; > unsigned int wsize; > u32 speed_hz = t->speed_hz ? : spi->max_speed_hz; > - u8 bits_per_word = t->bits_per_word ? : spi->bits_per_word; > + u8 bits_per_word = t->bits_per_word; > > - bits_per_word = bits_per_word ? : 8; > wsize = bits_per_word >> 3; /* in bytes */ > > if (prev_speed_hz != speed_hz > @@ -316,9 +315,8 @@ static int txx9spi_transfer(struct spi_device *spi, struct spi_message *m) > /* check each transfer's parameters */ > list_for_each_entry (t, &m->transfers, transfer_list) { > u32 speed_hz = t->speed_hz ? : spi->max_speed_hz; > - u8 bits_per_word = t->bits_per_word ? : spi->bits_per_word; > + u8 bits_per_word = t->bits_per_word; > > - bits_per_word = bits_per_word ? : 8; Have you verified here that bits_per_word can never be '0' here? What is the path that ensures spi->bits_per_word (and hence t->bits_per_word) is set to 8 here? Otherwise the patch looks good. Thanks for doing this work. g. ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d