[RFC][PATCH] spi: Setup the master controller driver before setting the chipselect

From: Franklin S Cooper Jr
Date: Mon Oct 12 2015 - 17:01:38 EST


Some devices depend on the master controller driver setup function being
called before calling any chipselect functions.

Insure that this is done otherwise uninitialized structures may be
accessed causing a kernel panic.

Signed-off-by: Franklin S Cooper Jr <fcooper@xxxxxx>
---
drivers/spi/spi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 38006cc..9374d82 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2053,11 +2053,11 @@ int spi_setup(struct spi_device *spi)
if (!spi->max_speed_hz)
spi->max_speed_hz = spi->master->max_speed_hz;

- spi_set_cs(spi, false);
-
if (spi->master->setup)
status = spi->master->setup(spi);

+ spi_set_cs(spi, false);
+
dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s%u bits/w, %u Hz max --> %d\n",
(int) (spi->mode & (SPI_CPOL | SPI_CPHA)),
(spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",
--
2.6.1

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