Re: [patch] MdeModulePkg: Fix issue the iSCSI client can not send reset packet correctly.

["Ye, Ting" <ting.ye@intel.com>]

Reviewed-by: Ye Ting <ting.ye@intel.com> 

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Zhang Lubo
Sent: Friday, April 28, 2017 2:41 PM
To: edk2-devel@lists.01.org
Cc: Ye, Ting <ting.ye@intel.com>; Fu, Siyuan <siyuan.fu@intel.com>; Wu, Jiaxin <jiaxin.wu@intel.com>
Subject: [edk2] [patch] MdeModulePkg: Fix issue the iSCSI client can not send reset packet correctly.

if we already established a iSCSI connection from initiator to target based on IPv4 stack, after using reconnect -r command, we can not rebuild the session with the windows target, since the server thought the session is still exist.  This issue is caused by wrong place of acquire ownership of sock lock which lead the iSCSI can not reset the connection correctly.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
---
 MdeModulePkg/Universal/Network/Tcp4Dxe/SockInterface.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/MdeModulePkg/Universal/Network/Tcp4Dxe/SockInterface.c b/MdeModulePkg/Universal/Network/Tcp4Dxe/SockInterface.c
index f8b535c..bca4b02 100644
--- a/MdeModulePkg/Universal/Network/Tcp4Dxe/SockInterface.c
+++ b/MdeModulePkg/Universal/Network/Tcp4Dxe/SockInterface.c
@@ -160,19 +160,10 @@ SockDestroyChild (
   ProtoData = (TCP4_PROTO_DATA *) Sock->ProtoReserved;
   Tcb       = ProtoData->TcpPcb;
 
   ASSERT (Tcb != NULL);
 
-  Status = EfiAcquireLockOrFail (&(Sock->Lock));
-  if (EFI_ERROR (Status)) {
-
-    DEBUG ((EFI_D_ERROR, "SockDestroyChild: Get the lock to "
-      "access socket failed with %r\n", Status));
-
-    return EFI_ACCESS_DENIED;
-  }
-
   //
   // Close the IP protocol.
   //
   gBS->CloseProtocol (
          Tcb->IpInfo->ChildHandle,
@@ -212,10 +203,19 @@ SockDestroyChild (
         &gEfiTcp4ProtocolGuid,
         SockProtocol,
         NULL
         );
 
+  Status = EfiAcquireLockOrFail (&(Sock->Lock));  if (EFI_ERROR 
+ (Status)) {
+
+    DEBUG ((EFI_D_ERROR, "SockDestroyChild: Get the lock to "
+      "access socket failed with %r\n", Status));
+
+    return EFI_ACCESS_DENIED;
+  }
+
   //
   // force protocol layer to detach the PCB
   //
   Status = Sock->ProtoHandler (Sock, SOCK_DETACH, NULL);
 
--
1.9.5.msysgit.1

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