[PATCH] HID: rmi: Check that the device is a RMI device in suspend and resume callbacks
From: Andrew Duggan <hidden>
Date: 2016-01-26 23:40:53
Also in:
lkml
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
Commit 092563604217 ("HID: rmi: Disable scanning if the device is not a
wake source") introduced a regression for devices which use hid-rmi to
handle composite USB devices. The suspend or resume callbacks are not
checking that the device is a RMI device before calling rmi_read or
rmi_write. This results in dereferencing uninitialized variables on
non RMI devices. This patch checks that the RMI_DEVICE flag is set before
sending RMI commands to the device.
Reported-by: Rodrigo Gomes <redacted>
Signed-off-by: Andrew Duggan <redacted>
---
drivers/hid/hid-rmi.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 67cd059..9cd2ca3 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c@@ -594,6 +594,9 @@ static int rmi_suspend(struct hid_device *hdev, pm_message_t message) int ret; u8 buf[RMI_F11_CTRL_REG_COUNT]; + if (!(data->device_flags & RMI_DEVICE)) + return 0; + ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, RMI_F11_CTRL_REG_COUNT); if (ret)
@@ -613,6 +616,9 @@ static int rmi_post_reset(struct hid_device *hdev) struct rmi_data *data = hid_get_drvdata(hdev); int ret; + if (!(data->device_flags & RMI_DEVICE)) + return 0; + ret = rmi_reset_attn_mode(hdev); if (ret) { hid_err(hdev, "can not set rmi mode\n");
@@ -640,6 +646,11 @@ static int rmi_post_reset(struct hid_device *hdev) static int rmi_post_resume(struct hid_device *hdev) { + struct rmi_data *data = hid_get_drvdata(hdev); + + if (!(data->device_flags & RMI_DEVICE)) + return 0; + return rmi_reset_attn_mode(hdev); } #endif /* CONFIG_PM */
--
2.5.0