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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2018-05-31 13:49:29 +0200
committerJiri Kosina <jkosina@suse.cz>2018-06-25 15:29:16 +0200
commit8f732850df1b2b4d8d719f7e606dfb3050e7ea11 (patch)
tree6404276bcb01659e9933242c89a9ba7672edcb66 /drivers/hid
parentd471b6b22d37bf9928c6d0202bdaaf76583b8b61 (diff)
downloadlinux-8f732850df1b2b4d8d719f7e606dfb3050e7ea11.tar.bz2
HID: core: allow concurrent registration of drivers
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. [jkosina@suse.cz: reformat changelog a bit] Fixes c17a7476e4c4 ("HID: core: rewrite the hid-generic automatic unbind") Cc: stable@vger.kernel.org # v4.17 Tested-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-core.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 355dc7e49562..a460ec147aee 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1949,6 +1949,8 @@ 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) {
@@ -2212,7 +2214,8 @@ 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;