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Subject: media: dvb-frontends: mn88443x: Handle errors of clk_prepare_enable() Author: Evgeny Novikov <[email protected]> Date: Sun Aug 22 11:48:03 2021 +0200 mn88443x_cmn_power_on() did not handle possible errors of clk_prepare_enable() and always finished successfully so that its caller mn88443x_probe() did not care about failed preparing/enabling of clocks as well. Add missed error handling in both mn88443x_cmn_power_on() and mn88443x_probe(). This required to change the return value of the former from "void" to "int". Found by Linux Driver Verification project (linuxtesting.org). Fixes: 0f408ce8941f ("media: dvb-frontends: add Socionext MN88443x ISDB-S/T demodulator driver") Signed-off-by: Evgeny Novikov <[email protected]> Co-developed-by: Kirill Shilimanov <[email protected]> Signed-off-by: Kirill Shilimanov <[email protected]> Signed-off-by: Sean Young <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/dvb-frontends/mn88443x.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) --- diff --git a/drivers/media/dvb-frontends/mn88443x.c b/drivers/media/dvb-frontends/mn88443x.c index e4528784f847..fff212c0bf3b 100644 --- a/drivers/media/dvb-frontends/mn88443x.c +++ b/drivers/media/dvb-frontends/mn88443x.c @@ -204,11 +204,18 @@ struct mn88443x_priv { struct regmap *regmap_t; }; -static void mn88443x_cmn_power_on(struct mn88443x_priv *chip) +static int mn88443x_cmn_power_on(struct mn88443x_priv *chip) { + struct device *dev = &chip->client_s->dev; struct regmap *r_t = chip->regmap_t; + int ret; - clk_prepare_enable(chip->mclk); + ret = clk_prepare_enable(chip->mclk); + if (ret) { + dev_err(dev, "Failed to prepare and enable mclk: %d\n", + ret); + return ret; + } gpiod_set_value_cansleep(chip->reset_gpio, 1); usleep_range(100, 1000); @@ -222,6 +229,8 @@ static void mn88443x_cmn_power_on(struct mn88443x_priv *chip) } else { regmap_write(r_t, HIZSET3, 0x8f); } + + return 0; } static void mn88443x_cmn_power_off(struct mn88443x_priv *chip) @@ -738,7 +747,10 @@ static int mn88443x_probe(struct i2c_client *client, chip->fe.demodulator_priv = chip; i2c_set_clientdata(client, chip); - mn88443x_cmn_power_on(chip); + ret = mn88443x_cmn_power_on(chip); + if (ret) + goto err_i2c_t; + mn88443x_s_sleep(chip); mn88443x_t_sleep(chip); _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
