linux-kernel - Re: [PATCH] hid-mcp2200 added driver for MCP2200 GPIOs

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Message-ID: <20230613204024.zdp45ofohdur462p@intel.intel>
Date:   Tue, 13 Jun 2023 22:40:24 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Johannes Roith <johannes@...-linux.rocks>
Cc:     jikos@...nel.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: Re: [PATCH] hid-mcp2200 added driver for MCP2200 GPIOs

Hi Joannes,

[...]

> +/* this executes the READ_ALL cmd */
> +static int mcp_cmd_read_all(struct mcp2200 *mcp)
> +{
> +	struct mcp_read_all *read_all;
> +	int len, t;
> +
> +	reinit_completion(&mcp->wait_in_report);
> +	mutex_lock(&mcp->lock);
> +
> +	read_all = kzalloc(sizeof(struct mcp_read_all), GFP_KERNEL);
> +	if (!read_all)
> +		return -ENOMEM;

where are you unlocking?

> +	read_all->cmd = READ_ALL;
> +	len = hid_hw_output_report(mcp->hdev, (u8 *) read_all,
> +			sizeof(struct mcp_read_all));
> +
> +	if (len != sizeof(struct mcp_read_all))
> +		return -EINVAL;

what about read_all? what about the lock?
> +
> +	kfree(read_all);
> +	mutex_unlock(&mcp->lock);
> +	t = wait_for_completion_timeout(&mcp->wait_in_report, msecs_to_jiffies(4000));
> +	if (!t)
> +		return -ETIMEDOUT;
> +
> +	/* return status, negative value if wrong response was received */
> +	return mcp->status;
> +}

[...]

Andi