[U-Boot] [u-boot] [PATCH] [2/2] [v1.4] mxc_fec: avoid free() calls to already freed pointers.

[javier Martin]

Sometimes, inside NetLoop, eth_halt() is called before eth_init() has
been called. This is harmless except for free() calls to pointers
which have not been allocated yet.

This patch initializes those pointers to NULL and allocates them only
the first time. This way we can get rid of free calls in halt callback.

This has been tested in i.MX27 Litekit board and eldk-4.2 toolchains.

Signed-off-by: Javier Martin <javier.martin at vista-silicon.com>
--
 drivers/net/fec_mxc.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index bd83a24..08a4dd5 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -55,6 +55,8 @@ struct fec_priv gfec = {
 	.tbd_base  = NULL,
 	.tbd_index = 0,
 	.bd        = NULL,
+	.rdb_ptr   = NULL,
+	.base_ptr  = NULL,
 };

 /*
@@ -228,7 +230,8 @@ static int fec_rbd_init(struct fec_priv *fec, int
count, int size)
 	uint32_t p = 0;

 	/* reserve data memory and consider alignment */
-	fec->rdb_ptr = malloc(size * count + DB_DATA_ALIGNMENT);
+	if (fec->rdb_ptr == NULL)
+		fec->rdb_ptr = malloc(size * count + DB_DATA_ALIGNMENT);
 	p = (uint32_t)fec->rdb_ptr;
 	if (!p) {
 		puts("fec_imx27: not enough malloc memory!\n");
@@ -363,8 +366,9 @@ static int fec_init(struct eth_device *dev, bd_t* bd)
 	 * Datasheet forces the startaddress of each chain is 16 byte
 	 * aligned
 	 */
-	fec->base_ptr = malloc((2 + FEC_RBD_NUM) *
-			sizeof(struct fec_bd) + DB_ALIGNMENT);
+	if (fec->base_ptr == NULL)
+		fec->base_ptr = malloc((2 + FEC_RBD_NUM) *
+				sizeof(struct fec_bd) + DB_ALIGNMENT);
 	base = (uint32_t)fec->base_ptr;
 	if (!base) {
 		puts("fec_imx27: not enough malloc memory!\n");
@@ -491,8 +495,6 @@ static void fec_halt(struct eth_device *dev)
 	writel(0, &fec->eth->ecntrl);
 	fec->rbd_index = 0;
 	fec->tbd_index = 0;
-	free(fec->rdb_ptr);
-	free(fec->base_ptr);
 	debug("eth_halt: done\n");
 }

-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com