Detected on the Dell XPS 9365.
The laptop has 2 devices that benefit from the hid-generic auto-unbinding.
When those 2 devices are presented to the userspace, udev loads both
wacom and hid-multitouch. When this happens, the code in
__hid_bus_reprobe_drivers() is called concurrently and the second device
gets reprobed twice.
An other bug in the power_supply subsystem prevent to remove the wacom
driver if it just finished its initialization, which basically kills
the wacom node.
Fixes c17a7476e4c4 ("HID: core: rewrite the hid-generic automatic unbind")
Cc: stable@xxxxxxxxxxxxxxx # v4.17
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
Hi Mario,
can you please test this on your faulty XPS?
I think it'll fix the issue, but I can not reproduce, so better wait for
your confirmation.
Jiri, ideally I would love to see this in v4.17 final, but Mario seems
to be on PTO until next week. I guess we'll just push this in v4.17.1
then. Also, if you can double check that it makes sense, that would be
nice :)
Cheers,
Benjamin
drivers/hid/hid-core.c | 5 ++++-
include/linux/hid.h | 3 ++-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 2f7367b1de00..7afed0c0f9e5 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1960,6 +1960,8 @@ static int hid_device_probe(struct device *dev)
}
hdev->io_started = false;
+ clear_bit(ffs(HID_STAT_REPROBED), &hdev->status);
+
if (!hdev->driver) {
id = hid_match_device(hdev, hdrv);
if (id == NULL) {
@@ -2223,7 +2225,8 @@ static int __hid_bus_reprobe_drivers(struct device *dev, void *data)
struct hid_device *hdev = to_hid_device(dev);
if (hdev->driver == hdrv &&
- !hdrv->match(hdev, hid_ignore_special_drivers))
+ !hdrv->match(hdev, hid_ignore_special_drivers) &&
+ !test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
return device_reprobe(dev);
return 0;
diff --git a/include/linux/hid.h b/include/linux/hid.h
index ee2510019033..aee281522c6d 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -517,6 +517,7 @@ struct hid_output_fifo {
#define HID_STAT_ADDED BIT(0)
#define HID_STAT_PARSED BIT(1)
#define HID_STAT_DUP_DETECTED BIT(2)
+#define HID_STAT_REPROBED BIT(3)
struct hid_input {
struct list_head list;
@@ -585,7 +586,7 @@ struct hid_device { /* device report descriptor */
bool battery_avoid_query;
#endif
- unsigned int status; /* see STAT flags above */
+ unsigned long status; /* see STAT flags above */
unsigned claimed; /* Claimed by hidinput, hiddev? */
unsigned quirks; /* Various quirks the device can pull on us */
bool io_started; /* If IO has started */
--
2.14.3
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