linux-kernel - [PATCH 6.0 588/862] HID: amd_sfh: Handle condition of "no sensors" for SFH1.1

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Date:   Wed, 19 Oct 2022 10:31:15 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Jiri Kosina <jkosina@...e.cz>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 588/862] HID: amd_sfh: Handle condition of "no sensors" for SFH1.1

From: Basavaraj Natikar <Basavaraj.Natikar@....com>

[ Upstream commit 68266bdcceec10ea364e62c63732cd6fe5a256a8 ]

Based on num_hid_devices, each sensor device registers to HID. If
"no sensors" then amd_sfh work initialization and scheduling
doesn’t make sense and return ENODEV to stop driver probe.
Hence add a check for num_hid_devices to handle special
case in the situation of "no sensors" for SFH1.1.

Fixes: 93ce5e0231d7 ("HID: amd_sfh: Implement SFH1.1 functionality")
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@....com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c
+++ b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c
@@ -110,6 +110,8 @@ static int amd_sfh1_1_hid_client_init(st
 	amd_sfh1_1_set_desc_ops(mp2_ops);
 
 	cl_data->num_hid_devices = amd_sfh_get_sensor_num(privdata, &cl_data->sensor_idx[0]);
+	if (cl_data->num_hid_devices == 0)
+		return -ENODEV;
 
 	INIT_DELAYED_WORK(&cl_data->work, amd_sfh_work);
 	INIT_DELAYED_WORK(&cl_data->work_buffer, amd_sfh_work_buffer);