wimax/i2400m: Implement pre/post reset support in the USB driver

The USB stack can callback a driver is about to be reset by an
external entity and right after it, so the driver can save state and
then restore it.

This commit implements said support; it is implemented actually in the
core, bus-generic driver [i2400m_{pre,post}_reset()] and used by the
bus-specific drivers. This way the SDIO driver can also use it once
said support is brought to the SDIO stack.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c
index 77567970fe9a..8b246cc498b1 100644
--- a/drivers/net/wimax/i2400m/usb.c
+++ b/drivers/net/wimax/i2400m/usb.c
@@ -637,6 +637,37 @@ int i2400mu_reset_resume(struct usb_interface *iface)
 }
 
 
+/*
+ * Another driver or user space is triggering a reset on the device
+ * which contains the interface passed as an argument. Cease IO and
+ * save any device state you need to restore.
+ *
+ * If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if
+ * you are in atomic context.
+ */
+static
+int i2400mu_pre_reset(struct usb_interface *iface)
+{
+        struct i2400mu *i2400mu = usb_get_intfdata(iface);
+        return i2400m_pre_reset(&i2400mu->i2400m);
+}
+
+
+/*
+ * The reset has completed.  Restore any saved device state and begin
+ * using the device again.
+ *
+ * If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if
+ * you are in atomic context.
+ */
+static
+int i2400mu_post_reset(struct usb_interface *iface)
+{
+        struct i2400mu *i2400mu = usb_get_intfdata(iface);
+        return i2400m_post_reset(&i2400mu->i2400m);
+}
+
+
 static
 struct usb_device_id i2400mu_id_table[] = {
         { USB_DEVICE(0x8086, USB_DEVICE_ID_I6050) },
@@ -660,6 +691,8 @@ struct usb_driver i2400mu_driver = {
         .reset_resume = i2400mu_reset_resume,
         .probe = i2400mu_probe,
         .disconnect = i2400mu_disconnect,
+        .pre_reset = i2400mu_pre_reset,
+        .post_reset = i2400mu_post_reset,
         .id_table = i2400mu_id_table,
         .supports_autosuspend = 1,
 };