Re: [PATCH v7 1/2] i2c: core: Add i2c_update_timeout() helper for dynamic transfer timeouts

[Mukesh Savaliya]

On 8/13/2026 11:15 AM, Aniket Randive wrote:
[...]

> +void i2c_update_timeout(struct i2c_adapter *adap, u32 bus_freq_hz,
> +			size_t len, unsigned int safety_coeff,
> +			unsigned int min_usec)
> +{
> +	u64 bit_usec = mul_u64_u32_div(len * 9, USEC_PER_SEC, bus_freq_hz);
let's validate bus_freq_hz to prevent from 0 value in case of any 
abnormal caller.

> +	u64 total_usec = bit_usec * safety_coeff + min_usec;
> +	unsigned long jiffies_val;
> +
> +	/* Userspace-configured timeout always takes precedence. */
> +	if (adap->user_timeout > 0) {
> +		adap->timeout = adap->user_timeout;
> +		return;
> +	}
> +
> +	jiffies_val = usecs_to_jiffies((unsigned int)min_t(u64, total_usec, UINT_MAX));
> +	/* adap->timeout is int; guard against signed overflow. */
> +	adap->timeout = (int)min_t(unsigned long, jiffies_val, INT_MAX);
> +}
> +EXPORT_SYMBOL_GPL(i2c_update_timeout);
> +#endif /* CONFIG_I2C_DYNAMIC_TIMEOUT */
> +

[...]