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authorAndrew Duggan <aduggan@synaptics.com>2016-01-26 15:40:36 -0800
committerJiri Kosina <jkosina@suse.cz>2016-01-27 22:39:32 +0100
commitb786ae8e269b5b30fea5efaab8cba32ba9aece61 (patch)
treee28df6aedf5fdef43d4364ec8bd1ec7aa05582ff /drivers/hid/hid-rmi.c
parent962b7a0e77015802f0ceefe6f0e3cad3f10fd4f8 (diff)
downloadlinux-b786ae8e269b5b30fea5efaab8cba32ba9aece61.tar.bz2
HID: rmi: Check that the device is a RMI device in suspend and resume callbacks
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 <rodrigo.toste.gomes@gmail.com> Signed-off-by: Andrew Duggan <aduggan@synaptics.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-rmi.c')
-rw-r--r--drivers/hid/hid-rmi.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 67cd059a8f46..9cd2ca34a6be 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 */