Hi Thinh, >On 9/7/2018 6:14 AM, Anurag Kumar Vulisha wrote: >> Availability of TRB's are calculated using dwc3_calc_trbs_left(), >> which determines available TRB's based on the HWO bit set in a TRB. >> >> __dwc3_prepare_one_trb() is called with a TRB which needs to be >> prepared for transfer. This __dwc3_prepare_one_trb() calls >> dwc3_calc_trbs_left() to determine total available TRBs and set IOC >> bit if the total available TRBs are zero. Since the present working >> TRB(which is passed as an argument to __dwc3_prepare_one_trb() ) >> doesn't have HWO bit already set, there are chances where >> dwc3_calc_trbs_left() wrongly calculates this present working TRB as >> free(since the HWO bit is not yet set). This could be a problem. This >> patch correct this issue by setting HWO bit before calling >> dwc3_calc_trbs_left() > >Please revise your commit message to reflect your new change. > Sorry , I missed updating the commit message. Thanks a lot for pointing, will fix it in next version Thanks, Anurag Kumar Vulisha >> >> Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xxxxxxxxxx> >> Reviewed-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx> >> --- >> Changes in v3: >> 1. Corrected the logic for setting HWO bit as suggested by "Thinh Nguyen" >> >> Changes in v2: >> 1. Changed the commit message >> --- >> drivers/usb/dwc3/gadget.c | 6 +++--- >> 1 file changed, 3 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c >> index 032ea7d..8a1622b 100644 >> --- a/drivers/usb/dwc3/gadget.c >> +++ b/drivers/usb/dwc3/gadget.c >> @@ -911,8 +911,6 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, >struct dwc3_trb *trb, >> struct usb_gadget *gadget = &dwc->gadget; >> enum usb_device_speed speed = gadget->speed; >> >> - dwc3_ep_inc_enq(dep); >> - >> trb->size = DWC3_TRB_SIZE_LENGTH(length); >> trb->bpl = lower_32_bits(dma); >> trb->bph = upper_32_bits(dma); >> @@ -991,7 +989,7 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, >struct dwc3_trb *trb, >> } >> >> if ((!no_interrupt && !chain) || >> - (dwc3_calc_trbs_left(dep) == 0)) >> + (dwc3_calc_trbs_left(dep) == 1)) >> trb->ctrl |= DWC3_TRB_CTRL_IOC; >> >> if (chain) >> @@ -1002,6 +1000,8 @@ static void __dwc3_prepare_one_trb(struct >> dwc3_ep *dep, struct dwc3_trb *trb, >> >> trb->ctrl |= DWC3_TRB_CTRL_HWO; >> >> + dwc3_ep_inc_enq(dep); >> + >> trace_dwc3_prepare_trb(dep, trb); >> } >> > >BR, >Thinh
