Fixed unexpected timeout in Usb MassStorage Driver.

[mirror_edk2.git] / MdeModulePkg / Bus / Usb / UsbMassStorageDxe / UsbMassImpl.h

diff --git a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassImpl.h b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassImpl.h
index eeff1edcda05a30a557443e5bb539c5369d0d31d..732861c3ec4790ecee1955ce95aa4dd6fd7f9de2 100644 (file)
--- a/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassImpl.h
+++ b/MdeModulePkg/Bus/Usb/UsbMassStorageDxe/UsbMassImpl.h
@@ -33,7 +33,13 @@ typedef struct _USB_MASS_DEVICE USB_MASS_DEVICE;
 #include "UsbMassBoot.h"\r
 \r
 enum {\r
-  USB_MASS_SIGNATURE= EFI_SIGNATURE_32 ('U', 's', 'b', 'K')\r
+  //\r
+  // MassStorage raises TPL to TPL_NOTIFY to serialize all its operations\r
+  // to protect shared data structures.\r
+  //\r
+  USB_MASS_TPL          = TPL_NOTIFY,\r
+  \r
+  USB_MASS_SIGNATURE    = EFI_SIGNATURE_32 ('U', 's', 'b', 'M'),\r
 };\r
 \r
 struct _USB_MASS_DEVICE {\r