This is a note to let you know that I've just added the patch titled usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue_done() 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-fix-to-avoid-using-a-disabled-ep-in-usbhsg_queue_done.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 4fccb0767fdbdb781a9c5b5c15ee7b219443c89d Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Date: Mon, 4 Apr 2016 20:40:20 +0900 Subject: usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue_done() From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> commit 4fccb0767fdbdb781a9c5b5c15ee7b219443c89d upstream. This patch fixes an issue that usbhsg_queue_done() may cause kernel panic when dma callback is running and usb_ep_disable() is called by interrupt handler. (Especially, we can reproduce this issue using g_audio with usb-dmac driver.) For example of a flow: usbhsf_dma_complete (on tasklet) --> usbhsf_pkt_handler (on tasklet) --> usbhsg_queue_done (on tasklet) *** interrupt happened and usb_ep_disable() is called *** --> usbhsg_queue_pop (on tasklet) Then, oops happened. Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support") 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/mod_gadget.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/usb/renesas_usbhs/mod_gadget.c +++ b/drivers/usb/renesas_usbhs/mod_gadget.c @@ -158,10 +158,14 @@ static void usbhsg_queue_done(struct usb struct usbhs_pipe *pipe = pkt->pipe; struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe); struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt); + unsigned long flags; ureq->req.actual = pkt->actual; - usbhsg_queue_pop(uep, ureq, 0); + usbhs_lock(priv, flags); + if (uep) + __usbhsg_queue_pop(uep, ureq, 0); + usbhs_unlock(priv, flags); } static void usbhsg_queue_push(struct usbhsg_uep *uep, Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@xxxxxxxxxxx are queue-4.4/usb-renesas_usbhs-fix-to-avoid-using-a-disabled-ep-in-usbhsg_queue_done.patch queue-4.4/usb-renesas_usbhs-avoid-null-pointer-derefernce-in-usbhsf_pkt_handler.patch queue-4.4/usb-renesas_usbhs-disable-tx-irq-before-starting-tx-dmac-transfer.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html