[PATCH v1 1/1] RamDiskDxe: Initialize list head before registering RAM disk protocol

["Daniel Schaefer" <daniel.schaefer@hpe.com>]

From: Trammell Hudson <hudson@trmm.net>

This patch initializes the linked list RegisteredRamDisks in
RamDiskDxeEntryPoint before the registration of gEfiRamDiskProtocolGuid
with InstallMultipleProtocolInterfaces, allowing ramdisks to be created
via a callback installed with RegisterProtocolNotify as soon as the
protocol is registered.

Without this, calling RamDisk->Register() in the callback causes a crash:

ASSERT [RamDiskDxe] MdePkg/Library/BaseLib/LinkedList.c(75): List->ForwardLink != ((void *) 0)

Signed-off-by: Trammell Hudson <hudson@trmm.net>
Cc: Daniel Schaefer <daniel.schaefer@hpe.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>

---
 MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
index fcbf4f117dc6..13e2aed87cef 100644
--- a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
+++ b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
@@ -154,6 +154,12 @@ RamDiskDxeEntryPoint (
     goto ErrorExit;
   }
 
+  //
+  // Initialize the list of registered RAM disks maintained by the driver
+  // before installing the protocol
+  //
+  InitializeListHead (&RegisteredRamDisks);
+
   //
   // Install the EFI_RAM_DISK_PROTOCOL and RAM disk private data onto a
   // new handle
@@ -170,11 +176,6 @@ RamDiskDxeEntryPoint (
     goto ErrorExit;
   }
 
-  //
-  // Initialize the list of registered RAM disks maintained by the driver
-  //
-  InitializeListHead (&RegisteredRamDisks);
-
   Status = EfiCreateEventReadyToBootEx (
              TPL_CALLBACK,
              RamDiskAcpiCheck,
-- 
2.31.1