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Date: Wed, 27 Apr 2016 01:02:21 +0200 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Felipe Balbi" <felipe.balbi@...ux.intel.com>, "Yoshihiro Shimoda" <yoshihiro.shimoda.uh@...esas.com> Subject: [PATCH 3.16 152/217] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer 3.16.35-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com> commit 6490865c67825277b29638e839850882600b48ec upstream. This patch adds a code to surely disable TX IRQ of the pipe before starting TX DMAC transfer. Otherwise, a lot of unnecessary TX IRQs may happen in rare cases when DMAC is used. Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com> Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/usb/renesas_usbhs/fifo.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -851,6 +851,7 @@ static int usbhsf_dma_prepare_push(struc pkt->trans = len; + usbhsf_tx_irq_ctrl(pipe, 0); INIT_WORK(&pkt->work, xfer_work); schedule_work(&pkt->work);
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