From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiner Kallweit Subject: [PATCH 22/23] spi: fsl-espi: improve message length handling Date: Thu, 25 Aug 2016 06:52:00 +0200 Message-ID: <1fa1d34d-e384-7134-d41f-2bfd96b69d2a@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: "linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" To: Mark Brown Return-path: In-Reply-To: Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Move checking for a zero-length message up in the call chain and use m->frame_length instead of re-calculating the overall length of all transfers in the message. Signed-off-by: Heiner Kallweit --- drivers/spi/spi-fsl-espi.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index a5a67ce..51b0213 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans) fsl_espi_setup_transfer(spi, trans); - if (trans->len) - ret = fsl_espi_bufs(spi, trans); + ret = fsl_espi_bufs(spi, trans); if (trans->delay_usecs) udelay(trans->delay_usecs); @@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master, struct spi_message *m) { struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master); - unsigned int delay_usecs = 0, xfer_len = 0; + unsigned int delay_usecs = 0; struct spi_transfer *t, trans = {}; int ret; @@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master, goto out; list_for_each_entry(t, &m->transfers, transfer_list) { - if ((t->tx_buf) || (t->rx_buf)) - xfer_len += t->len; if (t->delay_usecs > delay_usecs) delay_usecs = t->delay_usecs; } @@ -331,13 +328,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master, t = list_first_entry(&m->transfers, struct spi_transfer, transfer_list); - trans.len = xfer_len; + trans.len = m->frame_length; trans.speed_hz = t->speed_hz; trans.bits_per_word = t->bits_per_word; trans.delay_usecs = delay_usecs; trans.tx_buf = trans.rx_buf = mspi->local_buf; - ret = fsl_espi_trans(m, &trans); + if (trans.len) + ret = fsl_espi_trans(m, &trans); m->actual_length = ret ? 0 : trans.len; out: -- 2.9.2 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html