From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiner Kallweit Subject: [PATCH v3 03/15] spi: fsl-espi: remove element status from struct fsl_espi_transfer Date: Wed, 7 Sep 2016 22:51:10 +0200 Message-ID: <0b9b843a-c025-e655-14bc-fe5bd4ecf28a@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: Use the return values of the functions in the call chain to transport status information instead of using an element in struct fsl_espi_transfer for this. This is more in line with the general approach how to handle status information and is one step further to eventually get rid of struct fsl_espi_transfer completely. Signed-off-by: Heiner Kallweit --- v2: - rebased v3: - new numbering --- drivers/spi/spi-fsl-espi.c | 47 +++++++++++++++++++++++++--------------------- 1 file changed, 26 insertions(+), 21 deletions(-) diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index 8e6ef9b..5f01b65 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -42,7 +42,6 @@ struct fsl_espi_transfer { void *rx_buf; unsigned len; unsigned actual_length; - int status; }; /* eSPI Controller mode register definitions */ @@ -269,14 +268,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) return mpc8xxx_spi->count; } -static void fsl_espi_do_trans(struct spi_message *m, - struct fsl_espi_transfer *tr) +static int fsl_espi_do_trans(struct spi_message *m, + struct fsl_espi_transfer *tr) { struct spi_device *spi = m->spi; struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); struct fsl_espi_transfer *espi_trans = tr; struct spi_transfer *t, *first, trans; - int status = 0; + int ret = 0; memset(&trans, 0, sizeof(trans)); @@ -285,10 +284,9 @@ static void fsl_espi_do_trans(struct spi_message *m, list_for_each_entry(t, &m->transfers, transfer_list) { if ((first->bits_per_word != t->bits_per_word) || (first->speed_hz != t->speed_hz)) { - espi_trans->status = -EINVAL; dev_err(mspi->dev, "bits_per_word/speed_hz should be same for the same SPI transfer\n"); - return; + return -EINVAL; } trans.speed_hz = t->speed_hz; @@ -303,52 +301,59 @@ static void fsl_espi_do_trans(struct spi_message *m, fsl_espi_setup_transfer(spi, &trans); if (trans.len) - status = fsl_espi_bufs(spi, &trans); + ret = fsl_espi_bufs(spi, &trans); - if (status) - status = -EMSGSIZE; + if (ret) + ret = -EMSGSIZE; if (trans.delay_usecs) udelay(trans.delay_usecs); - espi_trans->status = status; fsl_espi_setup_transfer(spi, NULL); + + return ret; } -static void fsl_espi_cmd_trans(struct spi_message *m, - struct fsl_espi_transfer *trans, u8 *rx_buff) +static int fsl_espi_cmd_trans(struct spi_message *m, + struct fsl_espi_transfer *trans, u8 *rx_buff) { struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master); struct fsl_espi_transfer *espi_trans = trans; + int ret; fsl_espi_copy_to_buf(m, mspi); espi_trans->tx_buf = mspi->local_buf; espi_trans->rx_buf = mspi->local_buf; - fsl_espi_do_trans(m, espi_trans); + ret = fsl_espi_do_trans(m, espi_trans); espi_trans->actual_length = espi_trans->len; + + return ret; } -static void fsl_espi_rw_trans(struct spi_message *m, - struct fsl_espi_transfer *trans, u8 *rx_buff) +static int fsl_espi_rw_trans(struct spi_message *m, + struct fsl_espi_transfer *trans, u8 *rx_buff) { struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master); unsigned int tx_only; + int ret; tx_only = fsl_espi_copy_to_buf(m, mspi); trans->tx_buf = mspi->local_buf; trans->rx_buf = mspi->local_buf; - fsl_espi_do_trans(m, trans); + ret = fsl_espi_do_trans(m, trans); - if (!trans->status) { + if (!ret) { /* If there is at least one RX byte then copy it to rx_buff */ if (trans->len > tx_only) memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only); trans->actual_length += trans->len; } + + return ret; } static int fsl_espi_do_one_msg(struct spi_master *master, @@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master, u8 *rx_buf = NULL; unsigned int xfer_len = 0; struct fsl_espi_transfer espi_trans; + int ret; list_for_each_entry(t, &m->transfers, transfer_list) { if (t->rx_buf) @@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master, espi_trans.len = xfer_len; espi_trans.actual_length = 0; - espi_trans.status = 0; if (!rx_buf) - fsl_espi_cmd_trans(m, &espi_trans, NULL); + ret = fsl_espi_cmd_trans(m, &espi_trans, NULL); else - fsl_espi_rw_trans(m, &espi_trans, rx_buf); + ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf); m->actual_length = espi_trans.actual_length; - m->status = espi_trans.status; + m->status = ret; spi_finalize_current_message(master); return 0; } -- 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