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| author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-08-11 18:18:30 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-08-16 18:55:07 +0300 |
| commit | 1d88f831d20c10b5633cd71117917cd04a0735a8 (patch) | |
| tree | 023a5b137c228221c64d191179a5ad8a09d3ecb9 /drivers/media/i2c | |
| parent | ca05189716c2ce02c60303e9c1228a61d1cb9542 (diff) | |
| download | linux-1d88f831d20c10b5633cd71117917cd04a0735a8.tar.xz | |
[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 <mchehab@osg.samsung.com>
Acked-by: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/i2c')
| -rw-r--r-- | drivers/media/i2c/tc358743.c | 12 |
1 files changed, 11 insertions, 1 deletions
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; |