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[media] s5k5baf: allow to handle arbitrary long i2c sequences

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Using variable length array in s5k5baf_write_arr_seq caused
an implicit assumption that i2c sequences should be short.
The patch rewrites the function so it can handle sequences
of any length and does not use variable length array.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Andrzej Hajda 2014-01-09 09:55:43 -03:00 committed by Mauro Carvalho Chehab
parent c29b8f3149
commit 7e8f15c5aa
1 changed files with 20 additions and 12 deletions
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28
drivers/media/i2c/s5k5baf.c
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@ -478,25 +478,33 @@ static void s5k5baf_write_arr_seq(struct s5k5baf *state, u16 addr,
u16 count, const u16 *seq)
{
struct i2c_client *c = v4l2_get_subdevdata(&state->sd);
__be16 buf[count + 1];
int ret, n;
__be16 buf[65];
s5k5baf_i2c_write(state, REG_CMDWR_ADDR, addr);
if (state->error)
return;
buf[0] = __constant_cpu_to_be16(REG_CMD_BUF);
for (n = 1; n <= count; ++n)
buf[n] = cpu_to_be16(*seq++);
n *= 2;
ret = i2c_master_send(c, (char *)buf, n);
v4l2_dbg(3, debug, c, "i2c_write_seq(count=%d): %*ph\n", count,
min(2 * count, 64), seq - count);
min(2 * count, 64), seq);
if (ret != n) {
buf[0] = __constant_cpu_to_be16(REG_CMD_BUF);
while (count > 0) {
int n = min_t(int, count, ARRAY_SIZE(buf) - 1);
int ret, i;
for (i = 1; i <= n; ++i)
buf[i] = cpu_to_be16(*seq++);
i *= 2;
ret = i2c_master_send(c, (char *)buf, i);
if (ret != i) {
v4l2_err(c, "i2c_write_seq: error during transfer (%d)\n", ret);
state->error = ret;
break;
}
count -= n;
}
}