output log when no disk

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2450 bbd45198-f89e-11dd-88c7-29a3b14d5316

1 files changed, 6 insertions, 3 deletions

diff --git a/components/drivers/usb/usbdevice/class/mstorage.c b/components/drivers/usb/usbdevice/class/mstorage.c
index 58870dbd86..5d9242f964 100644
--- a/components/drivers/usb/usbdevice/class/mstorage.c
+++ b/components/drivers/usb/usbdevice/class/mstorage.c
@@ -487,13 +487,16 @@ static rt_err_t _class_run(udevice_t device)
 

     disk = rt_device_find(RT_USB_MSTORAGE_DISK_NAME);

     if(disk == RT_NULL)

-        return RT_ERROR;

+    {

+        rt_kprintf("no disk named %s\n", RT_USB_MSTORAGE_DISK_NAME);

+        return -RT_ERROR;

+    }    

     if(rt_device_control(disk, RT_DEVICE_CTRL_BLK_GETGEOME, (void*)&geometry) != RT_EOK)

-        return RT_ERROR;

+        return -RT_ERROR;

 

     buffer = (rt_uint8_t*)rt_malloc(geometry.bytes_per_sector);

     if(buffer == RT_NULL)

-        return RT_ERROR;

+        return -RT_ENOMEM;

     dcd_ep_read(device->dcd, ep_out, ep_out->buffer, SIZEOF_CBW);

 

     return RT_EOK;