davinci: edma: provide ability to detect insufficient CC info data

This patch modifies the EDMA driver to expect the channel
controller (CC) infomation passed on by the platform as a fixed
size (EDMA_MAX_CC) array of pointers to structures.

Doing so helps catch errors of the sort where the resource
structure has information for more channel controllers than
the number channel controller info structures defined.

Such insufficient platform data would lead to illegal memory
accesses.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 18 insertions, 11 deletions

diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index 8cda729be27..1d956bfa9cf 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -111,19 +111,21 @@ static const s8 da850_queue_priority_mapping[][2] = {
         {-1, -1}
 };
 
-static struct edma_soc_info da830_edma_info[] = {
-        {
-                .n_channel              = 32,
-                .n_region               = 4,
-                .n_slot                 = 128,
-                .n_tc                   = 2,
-                .n_cc                   = 1,
-                .queue_tc_mapping       = da8xx_queue_tc_mapping,
-                .queue_priority_mapping = da8xx_queue_priority_mapping,
-        },
+static struct edma_soc_info da830_edma_cc0_info = {
+        .n_channel              = 32,
+        .n_region               = 4,
+        .n_slot                 = 128,
+        .n_tc                   = 2,
+        .n_cc                   = 1,
+        .queue_tc_mapping       = da8xx_queue_tc_mapping,
+        .queue_priority_mapping = da8xx_queue_priority_mapping,
+};
+
+static struct edma_soc_info *da830_edma_info[EDMA_MAX_CC] = {
+        &da830_edma_cc0_info,
 };
 
-static struct edma_soc_info da850_edma_info[] = {
+static struct edma_soc_info da850_edma_cc_info[] = {
         {
                 .n_channel              = 32,
                 .n_region               = 4,
@@ -144,6 +146,11 @@ static struct edma_soc_info da850_edma_info[] = {
         },
 };
 
+static struct edma_soc_info *da850_edma_info[EDMA_MAX_CC] = {
+        &da850_edma_cc_info[0],
+        &da850_edma_cc_info[1],
+};
+
 static struct resource da830_edma_resources[] = {
         {
                 .name   = "edma_cc0",