| Message ID | 20211125150430.v3.2.I35b7f3a496f834de6b43a32f94b6160cb1467c94@changeid (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v3,1/2] Bluetooth: Send device found event on name resolve failure | expand |
Hi Archie, > When doing remote name request, we cannot scan. In the normal case it's > OK since we can expect it to finish within a short amount of time. > However, there is a possibility to scan lots of devices that > (1) requires Remote Name Resolve > (2) is unresponsive to Remote Name Resolve > When this happens, we are stuck to do Remote Name Resolve until all is > done before continue scanning. > > This patch adds a time limit to stop us spending too long on remote > name request. > > Signed-off-by: Archie Pusaka <apusaka@chromium.org> > Reviewed-by: Miao-chen Chou <mcchou@chromium.org> > > --- > > Changes in v3: > * Add units in comment > * change debug log to warn > > include/net/bluetooth/hci_core.h | 3 +++ > net/bluetooth/hci_event.c | 7 +++++++ > 2 files changed, 10 insertions(+) patch has been applied to bluetooth-next tree. Regards Marcel
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 2560cfe80db8..742cde106ae3 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -88,6 +88,7 @@ struct discovery_state { u8 (*uuids)[16]; unsigned long scan_start; unsigned long scan_duration; + unsigned long name_resolve_timeout; }; #define SUSPEND_NOTIFIER_TIMEOUT msecs_to_jiffies(2000) /* 2 seconds */ @@ -1759,6 +1760,8 @@ void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c); #define DISCOV_LE_FAST_ADV_INT_MIN 0x00A0 /* 100 msec */ #define DISCOV_LE_FAST_ADV_INT_MAX 0x00F0 /* 150 msec */ +#define NAME_RESOLVE_DURATION msecs_to_jiffies(10240) /* 10.24 sec */ + void mgmt_fill_version_info(void *ver); int mgmt_new_settings(struct hci_dev *hdev); void mgmt_index_added(struct hci_dev *hdev); diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index bb4c04aecccf..779c70b21039 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -2129,6 +2129,12 @@ static bool hci_resolve_next_name(struct hci_dev *hdev) if (list_empty(&discov->resolve)) return false; + /* We should stop if we already spent too much time resolving names. */ + if (time_after(jiffies, discov->name_resolve_timeout)) { + bt_dev_warn_ratelimited(hdev, "Name resolve takes too long."); + return false; + } + e = hci_inquiry_cache_lookup_resolve(hdev, BDADDR_ANY, NAME_NEEDED); if (!e) return false; @@ -2716,6 +2722,7 @@ static void hci_inquiry_complete_evt(struct hci_dev *hdev, struct sk_buff *skb) if (e && hci_resolve_name(hdev, e) == 0) { e->name_state = NAME_PENDING; hci_discovery_set_state(hdev, DISCOVERY_RESOLVING); + discov->name_resolve_timeout = jiffies + NAME_RESOLVE_DURATION; } else { /* When BR/EDR inquiry is active and no LE scanning is in * progress, then change discovery state to indicate completion.