Em Thu, 20 Dec 2018 00:57:44 -0600
Kangjie Lu <kjlu@xxxxxxx> escreveu:
> Function drxj_dap_write_reg16(), which writes data to buffer, may fail.
> We need to check if it fails, and if so, we should goto error.
Did you test this on a real hardware? This kind of patch has a potential
of breaking things, as, on some drivers, some writes may return error.
For example, when called on early stages, a write may fail because
the firmware was not loaded yet. So, a change like that should be
carefully tested with real hardware.
> Otherwise, the buffer will have incorrect data.
>
> Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
> ---
> drivers/media/dvb-frontends/drx39xyj/drxj.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/dvb-frontends/drx39xyj/drxj.c b/drivers/media/dvb-frontends/drx39xyj/drxj.c
> index 551b7d65fa66..d105125bc1c3 100644
> --- a/drivers/media/dvb-frontends/drx39xyj/drxj.c
> +++ b/drivers/media/dvb-frontends/drx39xyj/drxj.c
> @@ -2136,9 +2136,13 @@ int drxj_dap_atomic_read_write_block(struct i2c_device_addr *dev_addr,
>
> word = ((u16) data[2 * i]);
> word += (((u16) data[(2 * i) + 1]) << 8);
> - drxj_dap_write_reg16(dev_addr,
> + rc = drxj_dap_write_reg16(dev_addr,
> (DRXJ_HI_ATOMIC_BUF_START + i),
> word, 0);
> + if (rc) {
> + pr_err("error %d\n", rc);
> + goto rw_error;
> + }
> }
> }
>
Thanks,
Mauro
