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| author |   Antti Palosaari <crope@iki.fi> | 2013-11-07 17:35:43 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-12-19 09:20:29 -0200 |
| commit | 63c80f70435c5ecac0f94a1331a7dee249ba345b (patch) | |
| tree | b04e802df4836a897835a255ab9abd8439937a03 /drivers/media/dvb-frontends/m88ds3103.c | |
| parent | [media] m88ts2022: do not use dynamic stack allocation (diff) | |
| download | linux-dev-63c80f70435c5ecac0f94a1331a7dee249ba345b.tar.xz linux-dev-63c80f70435c5ecac0f94a1331a7dee249ba345b.zip | |
[media] m88ds3103: do not use dynamic stack allocation
I2C transfer were using dynamic stack allocation. Get rid of it.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/dvb-frontends/m88ds3103.c')
| -rw-r--r-- | drivers/media/dvb-frontends/m88ds3103.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 91b3729db604..302c923aa306 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -26,17 +26,22 @@ static struct dvb_frontend_ops m88ds3103_ops; static int m88ds3103_wr_regs(struct m88ds3103_priv *priv, u8 reg, const u8 *val, int len) { +#define MAX_WR_LEN 32 +#define MAX_WR_XFER_LEN (MAX_WR_LEN + 1) int ret; - u8 buf[1 + len]; + u8 buf[MAX_WR_XFER_LEN]; struct i2c_msg msg[1] = { { .addr = priv->cfg->i2c_addr, .flags = 0, - .len = sizeof(buf), + .len = 1 + len, .buf = buf, } }; + if (WARN_ON(len > MAX_WR_LEN)) + return -EINVAL; + buf[0] = reg; memcpy(&buf[1], val, len); @@ -59,8 +64,10 @@ static int m88ds3103_wr_regs(struct m88ds3103_priv *priv, static int m88ds3103_rd_regs(struct m88ds3103_priv *priv, u8 reg, u8 *val, int len) { +#define MAX_RD_LEN 3 +#define MAX_RD_XFER_LEN (MAX_RD_LEN) int ret; - u8 buf[len]; + u8 buf[MAX_RD_XFER_LEN]; struct i2c_msg msg[2] = { { .addr = priv->cfg->i2c_addr, @@ -70,11 +77,14 @@ static int m88ds3103_rd_regs(struct m88ds3103_priv *priv, }, { .addr = priv->cfg->i2c_addr, .flags = I2C_M_RD, - .len = sizeof(buf), + .len = len, .buf = buf, } }; + if (WARN_ON(len > MAX_RD_LEN)) + return -EINVAL; + mutex_lock(&priv->i2c_mutex); ret = i2c_transfer(priv->i2c, msg, 2); mutex_unlock(&priv->i2c_mutex); |