This is a note to let you know that I've just added the patch titled
usb: renesas_usbhs: Use dmac only if the pipe type is bulk
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-renesas_usbhs-use-dmac-only-if-the-pipe-type-is-bulk.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 700aa7ff8d2c2b9cc669c99375e2ccd06d3cd38d Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Date: Mon, 8 Aug 2016 21:50:53 +0900
Subject: usb: renesas_usbhs: Use dmac only if the pipe type is bulk
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
commit 700aa7ff8d2c2b9cc669c99375e2ccd06d3cd38d upstream.
This patch fixes an issue that isochronous transfer's data is possible to
be lost as a workaround. Since this driver uses a workqueue to start
the dmac, the transfer is possible to be delayed when system load is high.
Fixes: 6e4b74e4690d ("usb: renesas: fix scheduling in atomic context bug")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/renesas_usbhs/fifo.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -869,7 +869,7 @@ static int usbhsf_dma_prepare_push(struc
/* use PIO if packet is less than pio_dma_border or pipe is DCP */
if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
- usbhs_pipe_is_dcp(pipe))
+ usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
goto usbhsf_pio_prepare_push;
/* check data length if this driver don't use USB-DMAC */
@@ -974,7 +974,7 @@ static int usbhsf_dma_prepare_pop_with_u
/* use PIO if packet is less than pio_dma_border or pipe is DCP */
if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
- usbhs_pipe_is_dcp(pipe))
+ usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
goto usbhsf_pio_prepare_pop;
fifo = usbhsf_get_dma_fifo(priv, pkt);
Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@xxxxxxxxxxx are
queue-4.4/usb-renesas_usbhs-clear-the-brdysts-in-usbhsg_ep_enable.patch
queue-4.4/usb-renesas_usbhs-use-dmac-only-if-the-pipe-type-is-bulk.patch
--
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