From 2937d5ac11c421a02f276295f388994027bbe607 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Fri, 31 Jan 2014 13:44:59 +0100 Subject: spi: fsl: Fix problem with multi message transfers commit 4302a59629f7a0bd70fd1605d2b558597517372a upstream. When used via spidev with more than one messages to tranfer via SPI_IOC_MESSAGE the current implementation would return with -EINVAL, since bits_per_word and speed_hz are set in all transfer structs. And in the 2nd loop status will stay at -EINVAL as its not overwritten again via fsl_spi_setup_transfer(). This patch changes this behavious by first checking if one of the messages uses different settings. If this is the case the function will return with -EINVAL. If not, the messages are transferred correctly. Signed-off-by: Stefan Roese Signed-off-by: Mark Brown Cc: Esben Haabendal Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-fsl-spi.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c index 119f7af94537..4dcb2929c01f 100644 --- a/drivers/spi/spi-fsl-spi.c +++ b/drivers/spi/spi-fsl-spi.c @@ -362,18 +362,28 @@ static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t, static void fsl_spi_do_one_msg(struct spi_message *m) { struct spi_device *spi = m->spi; - struct spi_transfer *t; + struct spi_transfer *t, *first; unsigned int cs_change; const int nsecs = 50; int status; - cs_change = 1; - status = 0; + /* Don't allow changes if CS is active */ + first = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); list_for_each_entry(t, &m->transfers, transfer_list) { - if (t->bits_per_word || t->speed_hz) { - /* Don't allow changes if CS is active */ + if ((first->bits_per_word != t->bits_per_word) || + (first->speed_hz != t->speed_hz)) { status = -EINVAL; + dev_err(&spi->dev, + "bits_per_word/speed_hz should be same for the same SPI transfer\n"); + return; + } + } + cs_change = 1; + status = -EINVAL; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->bits_per_word || t->speed_hz) { if (cs_change) status = fsl_spi_setup_transfer(spi, t); if (status < 0) -- cgit v1.2.3