linux-kernel - Re: [PATCH V4] HID: HID-rmi - ignore to rmi_hid_read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 15 Aug 2022 13:12:41 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     margeyang <marge.yang@...aptics.corp-partner.google.com>,
        dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, benjamin.tissoires@...hat.com,
        dancarpenter@...cle.com
Cc:     marge.yang@...synaptics.com, derek.cheng@...synaptics.com,
        vincent.huang@...synaptics.com
Subject: Re: [PATCH V4] HID: HID-rmi - ignore to rmi_hid_read_block after
 system resumes.

Hi,

On 8/15/22 12:26, margeyang wrote:
> From: Marge Yang <marge.yang@...aptics.corp-partner.google.com>
> 
> The interrupt GPIO will be pulled down once
> after RMI driver reads this command(Report ID:0x0A).
> It will cause "Dark resume test fail" for chromebook device.
> Hence, TP driver will ignore rmi_hid_read_block function once
> after system resumes.
> 
> Signed-off-by: Marge Yang<marge.yang@...aptics.corp-partner.google.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> ---
>  drivers/hid/hid-rmi.c | 14 +++++++++++++-
>  include/linux/rmi.h   |  2 ++
>  2 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
> index 311eee599ce9..45eacb0b8dae 100644
> --- a/drivers/hid/hid-rmi.c
> +++ b/drivers/hid/hid-rmi.c
> @@ -190,7 +190,7 @@ static int rmi_hid_read_block(struct rmi_transport_dev *xport, u16 addr,
>  {
>  	struct rmi_data *data = container_of(xport, struct rmi_data, xport);
>  	struct hid_device *hdev = data->hdev;
> -	int ret;
> +	int ret = 0;
>  	int bytes_read;
>  	int bytes_needed;
>  	int retries;
> @@ -204,6 +204,13 @@ static int rmi_hid_read_block(struct rmi_transport_dev *xport, u16 addr,
>  			goto exit;
>  	}
>  
> +	if (xport->ignoreonce == 1) {
> +		dev_err(&hdev->dev,
> +			"ignoreonce (%d)\n",
> +			xport->ignoreonce);
> +		xport->ignoreonce = 0;
> +		goto exit;
> +	}
>  	for (retries = 5; retries > 0; retries--) {
>  		data->writeReport[0] = RMI_READ_ADDR_REPORT_ID;
>  		data->writeReport[1] = 0; /* old 1 byte read count */
> @@ -469,7 +476,12 @@ static int rmi_post_resume(struct hid_device *hdev)
>  	if (ret)
>  		return ret;
>  
> +	// Avoid to read rmi_hid_read_block once after system resumes.
> +	// The interrupt will be pulled down
> +	// after RMI Read command(Report ID:0x0A).
> +	data->xport.ignoreonce = 1;
>  	ret = rmi_reset_attn_mode(hdev);
> +	data->xport.ignoreonce = 0;
>  	if (ret)
>  		goto out;
>  
> diff --git a/include/linux/rmi.h b/include/linux/rmi.h
> index ab7eea01ab42..24f63ad00970 100644
> --- a/include/linux/rmi.h
> +++ b/include/linux/rmi.h
> @@ -270,6 +270,8 @@ struct rmi_transport_dev {
>  	struct rmi_device_platform_data pdata;
>  
>  	struct input_dev *input;
> +
> +	int ignoreonce;
>  };
>  
>  /**