[LTP] fw_load: Modernize ltp_fw_load kernel module

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Wed, Jun 10 2026, Andrea Cervesato wrote:
> fw_load: Modernize ltp_fw_load kernel module

--- [PATCH 2/3] ---

> +static void cleanup(void)
> +{
> +	struct fw_data *fw;
> +
> +	for (int i = fw_count - 1; i >= 0; i--) {
> +		fw = &firmware[i];
> +
> +		if (access(fw->file, F_OK) != -1)
> +			SAFE_UNLINK(fw->file);
> +
> +		if (access(fw->dir, F_OK) != -1)
> +			remove(fw->dir);
> +	}

The old code tracked whether each directory was created by the test
(the `remove_dir` flag) and only removed directories the test itself
made. The new code unconditionally attempts `remove()` on every
directory in the `firmware[]` array.

If a directory such as `/lib/firmware/updates/` existed before the
test and happened to be empty after the test file is unlinked,
`remove()` would delete it even though the test did not create it.

Could a flag (or an `access()` check before `SAFE_MKDIR`) be added
to restore the previous behaviour?

--- [PATCH 3/3] ---

> + * [Algorithm]
> + *
> + * - Set the firmware search path to the LTP temporary directory
> + * - Create ``FW_NUM - 1`` firmware files there, each named
> + *   ``n<i>_load_tst.fw`` and filled with a known byte pattern
> + * - Add one fake firmware entry that has no file on disk
> + * - Load the helper module with ``fw_size`` matching the blob size

The algorithm says the module is loaded after the firmware files are
created, but the code loads the module before creating the files
(lines 115-119). The order does not affect correctness since
`request_firmware()` is only triggered when writing to `fwnum`, but
the `[Algorithm]` section should match the actual code order.

Verdict: Needs revision

---
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