Re: [PATCH V6 01/16] rv: Add Runtime Verification (RV) interface

[Daniel Bristot de Oliveira]

On 7/20/22 16:47, Steven Rostedt wrote:
> On Tue, 19 Jul 2022 19:27:06 +0200
> Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> wrote:
> 
>> +/*
>> + * Interface to read the enable/disable status of a monitor.
>> + */
>> +static ssize_t monitor_desc_read_data(struct file *filp, char __user *user_buf, size_t count,
>> +				      loff_t *ppos)
>> +{
>> +	struct rv_monitor_def *mdef = filp->private_data;
>> +	char buff[256];
>> +
>> +	memset(buff, 0, sizeof(buff));
>> +
>> +	mutex_lock(&rv_interface_lock);
>> +	snprintf(buff, sizeof(buff), "%s\n", mdef->monitor->description);
>> +	mutex_unlock(&rv_interface_lock);
> 
> What exactly is the mutex protecting here?

I placed it around all access on read/write in the interface,
but indeed, it is not needed here (static data). It is in a file inside
the monitor's directory... so the directory is there, and the
module is there as well.

-- Daniel