From 1d88f831d20c10b5633cd71117917cd04a0735a8 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Tue, 11 Aug 2015 12:18:30 -0300 Subject: [media] tc358743: don't use variable length array for I2C writes drivers/media/i2c/tc358743.c:148:19: warning: Variable length array is used. As the maximum size is 1026, we can't use dynamic var, as it would otherwise spend 1056 bytes of the stack at i2c_wr() function. So, allocate a buffer with the allowed maximum size together with the state var. Signed-off-by: Mauro Carvalho Chehab Acked-by: Mats Randgaard Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/tc358743.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c index 2e926317d7e9..fe42c9a1cb78 100644 --- a/drivers/media/i2c/tc358743.c +++ b/drivers/media/i2c/tc358743.c @@ -59,6 +59,9 @@ MODULE_LICENSE("GPL"); #define EDID_NUM_BLOCKS_MAX 8 #define EDID_BLOCK_SIZE 128 +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE (EDID_NUM_BLOCKS_MAX * EDID_BLOCK_SIZE + 2) + static const struct v4l2_dv_timings_cap tc358743_timings_cap = { .type = V4L2_DV_BT_656_1120, /* keep this initialization for compatibility with GCC < 4.4.6 */ @@ -94,6 +97,9 @@ struct tc358743_state { /* edid */ u8 edid_blocks_written; + /* used by i2c_wr() */ + u8 wr_data[MAX_XFER_SIZE]; + struct v4l2_dv_timings timings; u32 mbus_fmt_code; @@ -143,9 +149,13 @@ static void i2c_wr(struct v4l2_subdev *sd, u16 reg, u8 *values, u32 n) { struct tc358743_state *state = to_state(sd); struct i2c_client *client = state->i2c_client; + u8 *data = state->wr_data; int err, i; struct i2c_msg msg; - u8 data[2 + n]; + + if ((2 + n) > sizeof(state->wr_data)) + v4l2_warn(sd, "i2c wr reg=%04x: len=%d is too big!\n", + reg, 2 + n); msg.addr = client->addr; msg.buf = data; -- cgit v1.2.3