| Message ID | 1308794413-11069-12-git-send-email-dirk.brandewie@gmail.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Thu, 23 Jun 2011 10:00:13 +0800 "dirk.brandewie@gmail.com" <dirk.brandewie@gmail.com> wrote: > From: Dirk Brandewie <dirk.brandewie@gmail.com> > > The value of spi->bits_per_word is checked on function entry to be 8 > or 16. The else clause has no meaning since it can never be reached. > > Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> > --- > drivers/spi/spi-dw.c | 9 +++------ > 1 files changed, 3 insertions(+), 6 deletions(-) > > diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c > index 7b3f607..5ddd45f 100644 > --- a/drivers/spi/spi-dw.c > +++ b/drivers/spi/spi-dw.c > @@ -667,17 +667,14 @@ static int spi_dw_setup(struct spi_device *spi) > chip->enable_dma = chip_info->enable_dma; > } > > - if (spi->bits_per_word <= 8) { > + if (spi->bits_per_word == 8) { > chip->n_bytes = 1; > chip->dma_width = 1; > - } else if (spi->bits_per_word <= 16) { > + } else if (spi->bits_per_word == 16) { > chip->n_bytes = 2; > chip->dma_width = 2; > - } else { > - /* Never take >16b case for DW SPIC */ > - dev_err(&spi->dev, "invalid wordsize\n"); > - return -EINVAL; > } These "else" case is used to ban the slave spi devices which try to use 32 bits per word mode. This is like to tell those spi devices with 32 bpw capability "we don't support 32b, pls change" > + > chip->bits_per_word = spi->bits_per_word; > > chip->speed_hz = spi->max_speed_hz; ------------------------------------------------------------------------------ Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev
On 06/22/2011 07:47 PM, Feng Tang wrote: > On Thu, 23 Jun 2011 10:00:13 +0800 > "dirk.brandewie@gmail.com"<dirk.brandewie@gmail.com> wrote: > >> From: Dirk Brandewie<dirk.brandewie@gmail.com> >> >> The value of spi->bits_per_word is checked on function entry to be 8 >> or 16. The else clause has no meaning since it can never be reached. >> >> Signed-off-by: Dirk Brandewie<dirk.brandewie@gmail.com> >> --- >> drivers/spi/spi-dw.c | 9 +++------ >> 1 files changed, 3 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c >> index 7b3f607..5ddd45f 100644 >> --- a/drivers/spi/spi-dw.c >> +++ b/drivers/spi/spi-dw.c >> @@ -667,17 +667,14 @@ static int spi_dw_setup(struct spi_device *spi) >> chip->enable_dma = chip_info->enable_dma; >> } >> >> - if (spi->bits_per_word<= 8) { >> + if (spi->bits_per_word == 8) { >> chip->n_bytes = 1; >> chip->dma_width = 1; >> - } else if (spi->bits_per_word<= 16) { >> + } else if (spi->bits_per_word == 16) { >> chip->n_bytes = 2; >> chip->dma_width = 2; >> - } else { >> - /* Never take>16b case for DW SPIC */ >> - dev_err(&spi->dev, "invalid wordsize\n"); >> - return -EINVAL; >> } > > These "else" case is used to ban the slave spi devices which > try to use 32 bits per word mode. This is like to tell those > spi devices with 32 bpw capability "we don't support 32b, pls > change" The function has the prerequisite code: if (spi->bits_per_word != 8 && spi->bits_per_word != 16) return -EINVAL; at the begining of the function so we will never be able to reach the else clause that is being removed. > >> + >> chip->bits_per_word = spi->bits_per_word; >> >> chip->speed_hz = spi->max_speed_hz; ------------------------------------------------------------------------------ Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 7b3f607..5ddd45f 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -667,17 +667,14 @@ static int spi_dw_setup(struct spi_device *spi) chip->enable_dma = chip_info->enable_dma; } - if (spi->bits_per_word <= 8) { + if (spi->bits_per_word == 8) { chip->n_bytes = 1; chip->dma_width = 1; - } else if (spi->bits_per_word <= 16) { + } else if (spi->bits_per_word == 16) { chip->n_bytes = 2; chip->dma_width = 2; - } else { - /* Never take >16b case for DW SPIC */ - dev_err(&spi->dev, "invalid wordsize\n"); - return -EINVAL; } + chip->bits_per_word = spi->bits_per_word; chip->speed_hz = spi->max_speed_hz;