staging: west bridge, addition of common lock on cyasdevice

This patch adds and initializes a common lock to
cyasdevice module. This is meant to be used in order
to avoid error scenarios where the device module
could be called by both the block and gadget modules
at the same time.
Signed-off-by: David Cross <david.cross@cypress.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/westbridge/astoria/device/cyasdevice.c

@@ -48,6 +48,8 @@ typedef struct cyasdevice {
 		cy_as_device_handle			dev_handle;
 		/* Handle to the HAL */
 		cy_as_hal_device_tag			hal_tag;
+		spinlock_t	  common_lock;
+		unsigned long flags;
 } cyasdevice;
 
 /* global ptr to astoria device */
@@ -126,6 +128,20 @@ static void cy_misc_callback(cy_as_device_handle h,
 	}
 }
 
+void cy_as_acquire_common_lock()
+{
+	spin_lock_irqsave(&cy_as_device_controller->common_lock,
+		cy_as_device_controller->flags);
+}
+EXPORT_SYMBOL(cy_as_acquire_common_lock);
+
+void cy_as_release_common_lock()
+{
+	spin_unlock_irqrestore(&cy_as_device_controller->common_lock,
+		cy_as_device_controller->flags);
+}
+EXPORT_SYMBOL(cy_as_release_common_lock);
+
 /* reset astoria and reinit all regs */
  #define PNAND_REG_CFG_INIT_VAL 0x0000
 void  hal_reset(cy_as_hal_device_tag tag)
@@ -331,6 +347,8 @@ static int cyasdevice_initialize(void)
 		((ver_data.is_debug_mode) ? "debug" : "release"),
 		ver_data.major, ver_data.minor, ver_data.build, str);
 
+	spin_lock_init(&cy_as_dev->common_lock);
+
 	/* done now */
 	cy_as_device_controller = cy_as_dev;