From: Nuno Sá Date: Tue, 7 Mar 2023 09:53:03 +0000 (+0100) Subject: iio: adc: max11410: fix read_poll_timeout() usage X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7b3825e9487d77e83bf1e27b10a74cd729b8f972;p=linux.git iio: adc: max11410: fix read_poll_timeout() usage Even though we are passing 'ret' as stop condition for read_poll_timeout(), that return code is still being ignored. The reason is that the poll will stop if the passed condition is true which will happen if the passed op() returns error. However, read_poll_timeout() returns 0 if the *complete* condition evaluates to true. Therefore, the error code returned by op() will be ignored. To fix this we need to check for both error codes: * The one returned by read_poll_timeout() which is either 0 or ETIMEDOUT. * The one returned by the passed op(). Fixes: a44ef7c46097 ("iio: adc: add max11410 adc driver") Signed-off-by: Nuno Sá Acked-by: Ibrahim Tilki Link: https://lore.kernel.org/r/20230307095303.713251-1-nuno.sa@analog.com Cc: Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/max11410.c b/drivers/iio/adc/max11410.c index fdc9f03135b54..e64cd979688d0 100644 --- a/drivers/iio/adc/max11410.c +++ b/drivers/iio/adc/max11410.c @@ -413,13 +413,17 @@ static int max11410_sample(struct max11410_state *st, int *sample_raw, if (!ret) return -ETIMEDOUT; } else { + int ret2; + /* Wait for status register Conversion Ready flag */ - ret = read_poll_timeout(max11410_read_reg, ret, - ret || (val & MAX11410_STATUS_CONV_READY_BIT), + ret = read_poll_timeout(max11410_read_reg, ret2, + ret2 || (val & MAX11410_STATUS_CONV_READY_BIT), 5000, MAX11410_CONVERSION_TIMEOUT_MS * 1000, true, st, MAX11410_REG_STATUS, &val); if (ret) return ret; + if (ret2) + return ret2; } /* Read ADC Data */ @@ -850,17 +854,21 @@ static int max11410_init_vref(struct device *dev, static int max11410_calibrate(struct max11410_state *st, u32 cal_type) { - int ret, val; + int ret, ret2, val; ret = max11410_write_reg(st, MAX11410_REG_CAL_START, cal_type); if (ret) return ret; /* Wait for status register Calibration Ready flag */ - return read_poll_timeout(max11410_read_reg, ret, - ret || (val & MAX11410_STATUS_CAL_READY_BIT), - 50000, MAX11410_CALIB_TIMEOUT_MS * 1000, true, - st, MAX11410_REG_STATUS, &val); + ret = read_poll_timeout(max11410_read_reg, ret2, + ret2 || (val & MAX11410_STATUS_CAL_READY_BIT), + 50000, MAX11410_CALIB_TIMEOUT_MS * 1000, true, + st, MAX11410_REG_STATUS, &val); + if (ret) + return ret; + + return ret2; } static int max11410_self_calibrate(struct max11410_state *st)