Re: [PATCH v6 2/3] zram: fix deadlock with sysfs attribute usage and module removal

[Andrew Morton]

On Fri,  2 Jul 2021 17:19:57 -0700 Luis Chamberlain <mcgrof@xxxxxxxxxx> wrote:

> +#define MODULE_DEVICE_ATTR_FUNC_STORE(_name) \
> +static ssize_t module_ ## _name ## _store(struct device *dev, \
> +				   struct device_attribute *attr, \
> +				   const char *buf, size_t len) \
> +{ \
> +	ssize_t __ret; \
> +	if (!try_module_get(THIS_MODULE)) \
> +		return -ENODEV; \
> +	__ret = _name ## _store(dev, attr, buf, len); \
> +	module_put(THIS_MODULE); \
> +	return __ret; \
> +}

I assume that Greg's comments on try_module_get() are applicable here
also.