[PATCH 4.19 07/32] usb: dwc2: Fix disable all EPs on disconnect

Greg Kroah-Hartman
2019-08-02T09:56:18Z

From: Minas Harutyunyan <minas.harutyunyan@synopsys.com>

commit 4fe4f9fecc36956fd53c8edf96dd0c691ef98ff9 upstream.

Disabling all EP's allow to reset EP's to initial state.
Introduced new function dwc2_hsotg_ep_disable_lock() which
before calling dwc2_hsotg_ep_disable() function acquire
hsotg->lock and release on exiting.
>From dwc2_hsotg_ep_disable() function removed acquiring
hsotg->lock.
In dwc2_hsotg_core_init_disconnected() function when USB
reset interrupt asserted disabling all ep’s by
dwc2_hsotg_ep_disable() function.
This updates eliminating sparse imbalance warnings.

Reverted changes in dwc2_hostg_disconnect() function.
Introduced new function dwc2_hsotg_ep_disable_lock().
Changed dwc2_hsotg_ep_ops. Now disable point to
dwc2_hsotg_ep_disable_lock() function.
In functions dwc2_hsotg_udc_stop() and dwc2_hsotg_suspend()
dwc2_hsotg_ep_disable() function replaced by
dwc2_hsotg_ep_disable_lock() function.
In dwc2_hsotg_ep_disable() function removed acquiring
of hsotg->lock.

Fixes: dccf1bad4be7 ("usb: dwc2: Disable all EP's on disconnect")
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/dwc2/gadget.c | 41 +++++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 18 deletions(-)

--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3107,8 +3107,6 @@ static void kill_all_requests(struct dwc
dwc2_hsotg_txfifo_flush(hsotg, ep->fifo_index);
}

-static int dwc2_hsotg_ep_disable(struct usb_ep *ep);
-
/**
* dwc2_hsotg_disconnect - disconnect service
* @hsotg: The device state.
@@ -3130,9 +3128,11 @@ void dwc2_hsotg_disconnect(struct dwc2_h
/* all endpoints should be shutdown */
for (ep = 0; ep < hsotg->num_of_eps; ep++) {
if (hsotg->eps_in[ep])
- dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
+ kill_all_requests(hsotg, hsotg->eps_in[ep],
+ -ESHUTDOWN);
if (hsotg->eps_out[ep])
- dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
+ kill_all_requests(hsotg, hsotg->eps_out[ep],
+ -ESHUTDOWN);
}

call_gadget(hsotg, disconnect);
@@ -3176,6 +3176,7 @@ static void dwc2_hsotg_irq_fifoempty(str
GINTSTS_PTXFEMP | \
GINTSTS_RXFLVL)

+static int dwc2_hsotg_ep_disable(struct usb_ep *ep);
/**
* dwc2_hsotg_core_init - issue softreset to the core
* @hsotg: The device state
@@ -4004,10 +4005,8 @@ static int dwc2_hsotg_ep_disable(struct
struct dwc2_hsotg *hsotg = hs_ep->parent;
int dir_in = hs_ep->dir_in;
int index = hs_ep->index;
- unsigned long flags;
u32 epctrl_reg;
u32 ctrl;
- int locked;

dev_dbg(hsotg->dev, "%s(ep %p)\n", __func__, ep);

@@ -4023,10 +4022,6 @@ static int dwc2_hsotg_ep_disable(struct

epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);

- locked = spin_is_locked(&hsotg->lock);
- if (!locked)
- spin_lock_irqsave(&hsotg->lock, flags);
-
ctrl = dwc2_readl(hsotg, epctrl_reg);

if (ctrl & DXEPCTL_EPENA)
@@ -4049,12 +4044,22 @@ static int dwc2_hsotg_ep_disable(struct
hs_ep->fifo_index = 0;
hs_ep->fifo_size = 0;

- if (!locked)
- spin_unlock_irqrestore(&hsotg->lock, flags);
-
return 0;
}

+static int dwc2_hsotg_ep_disable_lock(struct usb_ep *ep)
+{
+ struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
+ struct dwc2_hsotg *hsotg = hs_ep->parent;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&hsotg->lock, flags);
+ ret = dwc2_hsotg_ep_disable(ep);
+ spin_unlock_irqrestore(&hsotg->lock, flags);
+ return ret;
+}
+
/**
* on_list - check request is on the given endpoint
* @ep: The endpoint to check.
@@ -4202,7 +4207,7 @@ static int dwc2_hsotg_ep_sethalt_lock(st

static const struct usb_ep_ops dwc2_hsotg_ep_ops = {
.enable = dwc2_hsotg_ep_enable,
- .disable = dwc2_hsotg_ep_disable,
+ .disable = dwc2_hsotg_ep_disable_lock,
.alloc_request = dwc2_hsotg_ep_alloc_request,
.free_request = dwc2_hsotg_ep_free_request,
.queue = dwc2_hsotg_ep_queue_lock,
@@ -4342,9 +4347,9 @@ static int dwc2_hsotg_udc_stop(struct us
/* all endpoints should be shutdown */
for (ep = 1; ep < hsotg->num_of_eps; ep++) {
if (hsotg->eps_in[ep])
- dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
+ dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep);
if (hsotg->eps_out[ep])
- dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
+ dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep);
}

spin_lock_irqsave(&hsotg->lock, flags);
@@ -4792,9 +4797,9 @@ int dwc2_hsotg_suspend(struct dwc2_hsotg

for (ep = 0; ep < hsotg->num_of_eps; ep++) {
if (hsotg->eps_in[ep])
- dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
+ dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep);
if (hsotg->eps_out[ep])
- dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
+ dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep);
}
}