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authorRodrigo Rivas Costa <rodrigorivascosta@gmail.com>2018-05-22 22:10:06 +0200
committerJiri Kosina <jkosina@suse.cz>2018-06-20 09:27:23 +0200
commit4bff980f920693693d7a529c06a1bd1e7f77603a (patch)
tree8591283d9595a9ab3cd2a7c68e767ec9517d3c51
parent3e84c7651dde7cca43c5cfd7385086599cce5a5d (diff)
downloadlinux-4bff980f920693693d7a529c06a1bd1e7f77603a.tar.bz2
HID: steam: use hid_device.driver_data instead of hid_set_drvdata()
When creating the low-level hidraw device, the reference to steam_device was stored using hid_set_drvdata(). But this value is not guaranteed to be kept when set before calling probe. If this pointer is reset, it crashes when opening the emulated hidraw device. It looks like hid_set_drvdata() is for users "avobe" this hid_device, while hid_device.driver_data it for users "below" this one. In this case, we are creating a virtual hidraw device, so we must use hid_device.driver_data. Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com> Tested-by: Mariusz Ceier <mceier+kernel@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--drivers/hid/hid-steam.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
index cb86cc834201..0422ec2b13d2 100644
--- a/drivers/hid/hid-steam.c
+++ b/drivers/hid/hid-steam.c
@@ -573,7 +573,7 @@ static bool steam_is_valve_interface(struct hid_device *hdev)
static int steam_client_ll_parse(struct hid_device *hdev)
{
- struct steam_device *steam = hid_get_drvdata(hdev);
+ struct steam_device *steam = hdev->driver_data;
return hid_parse_report(hdev, steam->hdev->dev_rdesc,
steam->hdev->dev_rsize);
@@ -590,7 +590,7 @@ static void steam_client_ll_stop(struct hid_device *hdev)
static int steam_client_ll_open(struct hid_device *hdev)
{
- struct steam_device *steam = hid_get_drvdata(hdev);
+ struct steam_device *steam = hdev->driver_data;
int ret;
ret = hid_hw_open(steam->hdev);
@@ -605,7 +605,7 @@ static int steam_client_ll_open(struct hid_device *hdev)
static void steam_client_ll_close(struct hid_device *hdev)
{
- struct steam_device *steam = hid_get_drvdata(hdev);
+ struct steam_device *steam = hdev->driver_data;
mutex_lock(&steam->mutex);
steam->client_opened = false;
@@ -623,7 +623,7 @@ static int steam_client_ll_raw_request(struct hid_device *hdev,
size_t count, unsigned char report_type,
int reqtype)
{
- struct steam_device *steam = hid_get_drvdata(hdev);
+ struct steam_device *steam = hdev->driver_data;
return hid_hw_raw_request(steam->hdev, reportnum, buf, count,
report_type, reqtype);
@@ -710,7 +710,7 @@ static int steam_probe(struct hid_device *hdev,
ret = PTR_ERR(steam->client_hdev);
goto client_hdev_fail;
}
- hid_set_drvdata(steam->client_hdev, steam);
+ steam->client_hdev->driver_data = steam;
/*
* With the real steam controller interface, do not connect hidraw.