From 784097ae5a88f3f0b9aeab589e22091c3bf0f846 Mon Sep 17 00:00:00 2001
From: Matt Sealey <matt@genesi-usa.com>
Date: Fri, 17 Aug 2012 08:15:10 +0000
Subject: [PATCH] spi: fix mxc_spi_slave structure allocation to clear memory
Use calloc() instead of malloc() to allocate the mxc_spi_slave structure.
Clearing the memory is necessary since most of the time this gets done
super early in boot, but on warm reboots, and when SPI probing is done
long after the init stages it could actually pick up previously used memory,
and things like the chipselect polarity and other data end up being filled
with trash data if not explicitly set by the board files.
This solves a semi-random, almost unreproducable error whereby SPI devices
act very, very strangly on boot. Tested on Efika MX over several years..
Signed-off-by: Matt Sealey <matt@genesi-usa.com>
Acked-by: Stefano Babic <sbabic@denx.de>
---
drivers/spi/mxc_spi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index cf1462f94f..13bebe8ac1 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -408,7 +408,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
if (bus >= ARRAY_SIZE(spi_bases))
return NULL;
- mxcs = malloc(sizeof(struct mxc_spi_slave));
+ mxcs = calloc(sizeof(struct mxc_spi_slave), 1);
if (!mxcs) {
puts("mxc_spi: SPI Slave not allocated !\n");
return NULL;
--
2.39.5