On 13/07/15 04:39, Peter Chen wrote:
> On Fri, Jul 10, 2015 at 04:06:43PM +0800, Li Jun wrote:
>> On Wed, Jul 08, 2015 at 01:19:28PM +0300, Roger Quadros wrote:
>>> Move the state_changed variable into struct otg_fsm
>>> so that we can support multiple instances.
>>>
>> I am not sure if multiple instances may happen since OTG protocol requires
>> only one OTG port can be equipped on OTG device.
>>
>
> It is ok the software can support more than spec requires, the user can
> only use one and the spec may change in future :)
>
>> Li Jun
>>
>>> Signed-off-by: Roger Quadros <[email protected]>
>>> ---
>>> drivers/usb/common/usb-otg-fsm.c | 10 ++++------
>>> include/linux/usb/otg-fsm.h | 1 +
>>> 2 files changed, 5 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/usb/common/usb-otg-fsm.c
>>> b/drivers/usb/common/usb-otg-fsm.c
>>> index 61d538a..42c6376 100644
>>> --- a/drivers/usb/common/usb-otg-fsm.c
>>> +++ b/drivers/usb/common/usb-otg-fsm.c
>>> @@ -61,8 +61,6 @@ static int otg_set_protocol(struct otg_fsm *fsm, int
>>> protocol)
>>> return 0;
>>> }
>>>
>>> -static int state_changed;
>>> -
>>> /* Called when leaving a state. Do state clean up jobs here */
>>> static void otg_leave_state(struct otg_fsm *fsm, enum usb_otg_state
>>> old_state)
>>> {
>>> @@ -123,7 +121,7 @@ static void otg_leave_state(struct otg_fsm *fsm, enum
>>> usb_otg_state old_state)
>>> /* Called when entering a state */
>>> static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
>>> {
>>> - state_changed = 1;
>>> + fsm->state_changed = 1;
>>> if (fsm->otg->state == new_state)
>>> return 0;
>>
>> "fsm->state_changed = 1;" should be put here, I think.
>>
>
> Yes, seems it is the problem at current code.
Right. But I'll fix it as per Li's suggestion.
cheers,
-roger
>
>> Li Jun
>>
>>> VDBG("Set state: %s\n", usb_otg_state_string(new_state));
>>> @@ -248,7 +246,7 @@ int otg_statemachine(struct otg_fsm *fsm)
>>> mutex_lock(&fsm->lock);
>>>
>>> state = fsm->otg->state;
>>> - state_changed = 0;
>>> + fsm->state_changed = 0;
>>> /* State machine state change judgement */
>>>
>>> switch (state) {
>>> @@ -361,7 +359,7 @@ int otg_statemachine(struct otg_fsm *fsm)
>>> }
>>> mutex_unlock(&fsm->lock);
>>>
>>> - VDBG("quit statemachine, changed = %d\n", state_changed);
>>> - return state_changed;
>>> + VDBG("quit statemachine, changed = %d\n", fsm->state_changed);
>>> + return fsm->state_changed;
>>> }
>>> EXPORT_SYMBOL_GPL(otg_statemachine);
>>> diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
>>> index ca508c2..243274f 100644
>>> --- a/include/linux/usb/otg-fsm.h
>>> +++ b/include/linux/usb/otg-fsm.h
>>> @@ -194,6 +194,7 @@ struct otg_fsm {
>>> /* Current usb protocol used: 0:undefine; 1:host; 2:client */
>>> int protocol;
>>> struct mutex lock;
>>> + bool state_changed;
>>> };
>>>
>>> struct otg_fsm_ops {
>>> --
>>> 2.1.4
>>>
>
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