This allows to give more control from BPF during report descriptor fixup.
We already reset the quirks before calling ->probe(), so now we reset
it once before calling hid_bpf_rdesc_fixup().
Signed-off-by: Benjamin Tissoires <bentiss@xxxxxxxxxx>
---
new in v2
---
drivers/hid/bpf/hid_bpf_struct_ops.c | 1 +
drivers/hid/hid-core.c | 10 ++++++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/bpf/hid_bpf_struct_ops.c b/drivers/hid/bpf/hid_bpf_struct_ops.c
index cd696c59ba0f..e4c25ade54a3 100644
--- a/drivers/hid/bpf/hid_bpf_struct_ops.c
+++ b/drivers/hid/bpf/hid_bpf_struct_ops.c
@@ -79,6 +79,7 @@ static int hid_bpf_ops_btf_struct_access(struct bpf_verifier_log *log,
WRITE_RANGE(hid_device, name, true),
WRITE_RANGE(hid_device, uniq, true),
WRITE_RANGE(hid_device, phys, true),
+ WRITE_RANGE(hid_device, quirks, false),
};
#undef WRITE_RANGE
const struct btf_type *state = NULL;
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 2b70a12a2135..37e52759a931 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2676,9 +2676,17 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
int ret;
if (!hdev->bpf_rsize) {
+ unsigned int quirks;
+
+ /* reset the quirks that has been previously set */
+ quirks = hid_lookup_quirk(hdev);
+ hdev->quirks = quirks;
hdev->bpf_rsize = hdev->dev_rsize;
hdev->bpf_rdesc = call_hid_bpf_rdesc_fixup(hdev, hdev->dev_rdesc,
&hdev->bpf_rsize);
+ if (quirks ^ hdev->quirks)
+ hid_info(hdev, "HID-BPF toggled quirks on the device: %04x",
+ quirks ^ hdev->quirks);
}
if (!hid_check_device_match(hdev, hdrv, &id))
@@ -2688,8 +2696,6 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
if (!hdev->devres_group_id)
return -ENOMEM;
- /* reset the quirks that has been previously set */
- hdev->quirks = hid_lookup_quirk(hdev);
hdev->driver = hdrv;
if (hdrv->probe) {
--
2.46.0
