[PATCH] staging: pi433: add rw semaphore fixing concurrency issues

[valdis.kletnieks at vt.edu]

On Fri, 01 Jun 2018 08:50:37 -0400, Hugo Lefeuvre said:

> @@ -805,9 +809,11 @@ pi433_read(struct file *filp, char __user *buf, size_t size, loff_t *f_pos)
>  	if (bytes_received > 0) {
>  		retval = copy_to_user(buf, device->rx_buffer, bytes_received);
>  		if (retval)
> +			up_read(&instance->instance_sem);
>  			return -EFAULT;
>  	}
>
> +	up_read(&instance->instance_sem);
>  	return bytes_received;
>  }

This doesn't do what you think.
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