This patch changes the read of the td status to one atomic operation to
analyse coherent bits.
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
---
drivers/usb/chipidea/udc.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 21e1dd6..19fc185 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -495,10 +495,12 @@ done:
*/
static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
{
+ u32 tmptoken = cpu_to_le32(mReq->ptr->token);
+
if (mReq->req.status != -EALREADY)
return -EINVAL;
- if ((cpu_to_le32(TD_STATUS_ACTIVE) & mReq->ptr->token) != 0)
+ if ((TD_STATUS_ACTIVE & tmptoken) != 0)
return -EBUSY;
if (mReq->zptr) {
@@ -512,7 +514,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
usb_gadget_unmap_request(&mEp->ci->gadget, &mReq->req, mEp->dir);
- mReq->req.status = le32_to_cpu(mReq->ptr->token) & TD_STATUS;
+ mReq->req.status = tmptoken & TD_STATUS;
if ((TD_STATUS_HALTED & mReq->req.status) != 0)
mReq->req.status = -1;
else if ((TD_STATUS_DT_ERR & mReq->req.status) != 0)
@@ -520,7 +522,7 @@ static int _hardware_dequeue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
else if ((TD_STATUS_TR_ERR & mReq->req.status) != 0)
mReq->req.status = -1;
- mReq->req.actual = le32_to_cpu(mReq->ptr->token) & TD_TOTAL_BYTES;
+ mReq->req.actual = tmptoken & TD_TOTAL_BYTES;
mReq->req.actual >>= __ffs(TD_TOTAL_BYTES);
mReq->req.actual = mReq->req.length - mReq->req.actual;
mReq->req.actual = mReq->req.status ? 0 : mReq->req.actual;
--
1.8.2.rc2
--
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