This is a note to let you know that I've just added the patch titled usb: renesas_usbhs: gadget: disable all eps when the driver stops to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >From b8b9c974afee685789fcbb191b52d1790be3608c Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Date: Wed, 19 Jul 2017 16:16:55 +0900 Subject: usb: renesas_usbhs: gadget: disable all eps when the driver stops A gadget driver will not disable eps immediately when ->disconnect() is called. But, since this driver assumes all eps stop after the ->disconnect(), unexpected behavior happens (especially in system suspend). So, this patch disables all eps in usbhsg_try_stop(). After disabling eps by renesas_usbhs driver, since some functions will be called by both a gadget and renesas_usbhs driver, renesas_usbhs driver should protect uep->pipe. To protect uep->pipe easily, this patch adds a new lock in struct usbhsg_uep. Fixes: 2f98382dc ("usb: renesas_usbhs: Add Renesas USBHS Gadget") Cc: <stable@xxxxxxxxxxxxxxx> # v3.0+ Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> --- drivers/usb/renesas_usbhs/mod_gadget.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c index 5bc7a6138855..93fba9033b00 100644 --- a/drivers/usb/renesas_usbhs/mod_gadget.c +++ b/drivers/usb/renesas_usbhs/mod_gadget.c @@ -37,6 +37,7 @@ struct usbhsg_gpriv; struct usbhsg_uep { struct usb_ep ep; struct usbhs_pipe *pipe; + spinlock_t lock; /* protect the pipe */ char ep_name[EP_NAME_SIZE]; @@ -636,10 +637,16 @@ static int usbhsg_ep_enable(struct usb_ep *ep, static int usbhsg_ep_disable(struct usb_ep *ep) { struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); - struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); + struct usbhs_pipe *pipe; + unsigned long flags; + int ret = 0; - if (!pipe) - return -EINVAL; + spin_lock_irqsave(&uep->lock, flags); + pipe = usbhsg_uep_to_pipe(uep); + if (!pipe) { + ret = -EINVAL; + goto out; + } usbhsg_pipe_disable(uep); usbhs_pipe_free(pipe); @@ -647,6 +654,9 @@ static int usbhsg_ep_disable(struct usb_ep *ep) uep->pipe->mod_private = NULL; uep->pipe = NULL; +out: + spin_unlock_irqrestore(&uep->lock, flags); + return 0; } @@ -696,8 +706,11 @@ static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req) { struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep); struct usbhsg_request *ureq = usbhsg_req_to_ureq(req); - struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep); + struct usbhs_pipe *pipe; + unsigned long flags; + spin_lock_irqsave(&uep->lock, flags); + pipe = usbhsg_uep_to_pipe(uep); if (pipe) usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq)); @@ -706,6 +719,7 @@ static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req) * even if the pipe is NULL. */ usbhsg_queue_pop(uep, ureq, -ECONNRESET); + spin_unlock_irqrestore(&uep->lock, flags); return 0; } @@ -852,10 +866,10 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status) { struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv); struct usbhs_mod *mod = usbhs_mod_get_current(priv); - struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv); + struct usbhsg_uep *uep; struct device *dev = usbhs_priv_to_dev(priv); unsigned long flags; - int ret = 0; + int ret = 0, i; /******************** spin lock ********************/ usbhs_lock(priv, flags); @@ -887,7 +901,9 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status) usbhs_sys_set_test_mode(priv, 0); usbhs_sys_function_ctrl(priv, 0); - usbhsg_ep_disable(&dcp->ep); + /* disable all eps */ + usbhsg_for_each_uep_with_dcp(uep, gpriv, i) + usbhsg_ep_disable(&uep->ep); dev_dbg(dev, "stop gadget\n"); @@ -1069,6 +1085,7 @@ int usbhs_mod_gadget_probe(struct usbhs_priv *priv) ret = -ENOMEM; goto usbhs_mod_gadget_probe_err_gpriv; } + spin_lock_init(&uep->lock); gpriv->transceiver = usb_get_phy(USB_PHY_TYPE_UNDEFINED); dev_info(dev, "%stransceiver found\n", -- 2.13.3