Hi Marcel,
On Wed, Mar 7, 2012 at 4:23 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
> Hi Andre,
>
>> > * Andre Guedes <andre.guedes@xxxxxxxxxxxxx> [2012-03-06 19:54:33 -0300]:
>> >
>> >> This patch adds to hci_core the hci_cancel_le_scan function which
>> >> should be used to cancel an ongoing LE scan.
>> >>
>> >> Signed-off-by: Andre Guedes <andre.guedes@xxxxxxxxxxxxx>
>> >> ---
>> >> include/net/bluetooth/hci_core.h | 1 +
>> >> net/bluetooth/hci_core.c | 21 +++++++++++++++++++++
>> >> 2 files changed, 22 insertions(+)
>> >>
>> >> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
>> >> index 25cb0a1..0db2934 100644
>> >> --- a/include/net/bluetooth/hci_core.h
>> >> +++ b/include/net/bluetooth/hci_core.h
>> >> @@ -1072,5 +1072,6 @@ int hci_do_inquiry(struct hci_dev *hdev, u8 length);
>> >> int hci_cancel_inquiry(struct hci_dev *hdev);
>> >> int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
>> >> int timeout);
>> >> +int hci_cancel_le_scan(struct hci_dev *hdev);
>> >>
>> >> #endif /* __HCI_CORE_H */
>> >> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
>> >> index 661d65f..0c2ceaa 100644
>> >> --- a/net/bluetooth/hci_core.c
>> >> +++ b/net/bluetooth/hci_core.c
>> >> @@ -1672,6 +1672,27 @@ static int hci_do_le_scan(struct hci_dev *hdev, u8 type, u16 interval,
>> >> return 0;
>> >> }
>> >>
>> >> +int hci_cancel_le_scan(struct hci_dev *hdev)
>> >> +{
>> >> + bool canceled;
>> >> +
>> >> + BT_DBG("%s", hdev->name);
>> >> +
>> >> + if (!test_bit(HCI_LE_SCAN, &hdev->dev_flags))
>> >> + return -EPERM;
>> >
>> > Are you sure about this -EPERM return error here? At a glance -EALREADY looks
>> > better to me.
>>
>> This function cancels an operation (LE scan). If the operation is not
>> running, it makes more sense to me returning "Operation not permitted"
>> instead of "Operation already in progress".
>
> actually EPERM is for operation not permitted because you do not have
> rights to access is. Not because it is invalid operation.
>
> You need to find a better error code.
Ok, then, as Gustavo suggested, EALREADY looks really better.
Are you fine with EALREADY?
Andre
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