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| author | Will Newton <will.newton@gmail.com> | 2008-08-12 15:39:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-17 14:41:07 -0700 |
| commit | 59097fb73cf60276053551308524f6c772f305a9 (patch) | |
| tree | ac240300da3c23d3536ad3cec3eee0f27a71b0bb | |
| parent | 224b50390104af7602871894540d94cc759dc4c0 (diff) | |
| download | linux-stable-59097fb73cf60276053551308524f6c772f305a9.tar.gz linux-stable-59097fb73cf60276053551308524f6c772f305a9.tar.bz2 linux-stable-59097fb73cf60276053551308524f6c772f305a9.zip | |
fsl_usb2_udc: Add a wmb before priming endpoint.
Add a wmb to fsl_queue_td before priming the endpoint. This ensures that the
modifications to the QH are seen by the hardware.
Added comment as suggested by Felipe Balbi.
Signed-off-by: Will Newton <will.newton@gmail.com>
Acked-by: Li Yang <leoli@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/gadget/fsl_usb2_udc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c index 6f6272031344..0492441bc0ba 100644 --- a/drivers/usb/gadget/fsl_usb2_udc.c +++ b/drivers/usb/gadget/fsl_usb2_udc.c @@ -643,6 +643,9 @@ static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req) | EP_QUEUE_HEAD_STATUS_HALT)); dQH->size_ioc_int_sts &= temp; + /* Ensure that updates to the QH will occure before priming. */ + wmb(); + /* Prime endpoint by writing 1 to ENDPTPRIME */ temp = ep_is_in(ep) ? (1 << (ep_index(ep) + 16)) |