usb: renesas_usbhs: add usbhsh_is_running()

It is possible to judge whether renesas_usbhs driver is running,
by checking attch irq mask.
This patch adds usbhsh_is_running() to check it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/usb/renesas_usbhs/mod_host.c b/drivers/usb/renesas_usbhs/mod_host.c
index c947d0aca9bf..28b2cb3a029a 100644
--- a/drivers/usb/renesas_usbhs/mod_host.c
+++ b/drivers/usb/renesas_usbhs/mod_host.c
@@ -191,6 +191,21 @@ static void usbhsh_ureq_free(struct usbhsh_hpriv *hpriv,
 }
 
 /*
+ *              status
+ */
+static int usbhsh_is_running(struct usbhsh_hpriv *hpriv)
+{
+        /*
+         * we can decide some device is attached or not
+         * by checking mod.irq_attch
+         * see
+         *      usbhsh_irq_attch()
+         *      usbhsh_irq_dtch()
+         */
+        return (hpriv->mod.irq_attch == NULL);
+}
+
+/*
  *              pipe control
  */
 static void usbhsh_endpoint_sequence_save(struct usbhsh_hpriv *hpriv,
@@ -900,6 +915,11 @@ static int usbhsh_urb_enqueue(struct usb_hcd *hcd,
 
         dev_dbg(dev, "%s (%s)\n", __func__, is_dir_in ? "in" : "out");
 
+        if (!usbhsh_is_running(hpriv)) {
+                ret = -EIO;
+                goto usbhsh_urb_enqueue_error_not_linked;
+        }
+
         ret = usb_hcd_link_urb_to_ep(hcd, urb);
         if (ret)
                 goto usbhsh_urb_enqueue_error_not_linked;
@@ -1249,6 +1269,12 @@ static int usbhsh_irq_attch(struct usbhs_priv *priv,
          * attch interrupt might happen infinitely on some device
          * (on self power USB hub ?)
          * disable it here.
+         *
+         * usbhsh_is_running() becomes effective
+         * according to this process.
+         * see
+         *      usbhsh_is_running()
+         *      usbhsh_urb_enqueue()
          */
         hpriv->mod.irq_attch = NULL;
         usbhs_irq_callback_update(priv, &hpriv->mod);
@@ -1269,6 +1295,12 @@ static int usbhsh_irq_dtch(struct usbhs_priv *priv,
 
         /*
          * enable attch interrupt again
+         *
+         * usbhsh_is_running() becomes invalid
+         * according to this process.
+         * see
+         *      usbhsh_is_running()
+         *      usbhsh_urb_enqueue()
          */
         hpriv->mod.irq_attch = usbhsh_irq_attch;
         usbhs_irq_callback_update(priv, &hpriv->mod);