From e76d2a81bc350aebf4ae56753fb75983c7a4efdd Mon Sep 17 00:00:00 2001 From: Akshay Saraswat Date: Wed, 18 Jun 2014 17:52:41 +0530 Subject: [PATCH] Exynos: SPI: Fix reading data from SPI flash SPI recieve and transfer code in exynos_spi driver has a logical bug. We read data in a variable which can hold an integer. Then we assign this integer 32 bit value to another variable which has data type uchar. Latter represents a unit of our recieve buffer. Everytime when we write a value to our recieve buffer we step ahead by 4 units when actually we wrote to one unit. This results in the loss of 3 bytes out of every 4 bytes recieved. This patch intends to fix this bug. Signed-off-by: Akshay Saraswat Acked-by: Simon Glass Tested-by: Simon Glass Signed-off-by: Minkyu Kang --- drivers/spi/exynos_spi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/spi/exynos_spi.c b/drivers/spi/exynos_spi.c index 4d5def2d31..c92276fdf7 100644 --- a/drivers/spi/exynos_spi.c +++ b/drivers/spi/exynos_spi.c @@ -302,7 +302,10 @@ static int spi_rx_tx(struct exynos_spi_slave *spi_slave, int todo, } } else { if (rxp || stopping) { - *rxp = temp; + if (step == 4) + *(uint32_t *)rxp = temp; + else + *rxp = temp; rxp += step; } in_bytes -= step; -- 2.30.2