[PATCH v2 09/13] OvmfPkg/MptScsiDxe: Open PciIo protocol for later use

["Nikita Leshenko" <nikita.leshchenko@oracle.com>]

This will give us an exclusive access to the PciIo of this device
after it was started and until is will be stopped.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2390
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
---
 OvmfPkg/MptScsiDxe/MptScsi.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/OvmfPkg/MptScsiDxe/MptScsi.c b/OvmfPkg/MptScsiDxe/MptScsi.c
index d72af2b3f7..22001da763 100644
--- a/OvmfPkg/MptScsiDxe/MptScsi.c
+++ b/OvmfPkg/MptScsiDxe/MptScsi.c
@@ -40,6 +40,7 @@ typedef struct {
   UINT32                          Signature;
   EFI_EXT_SCSI_PASS_THRU_PROTOCOL PassThru;
   EFI_EXT_SCSI_PASS_THRU_MODE     PassThruMode;
+  EFI_PCI_IO_PROTOCOL             *PciIo;
 } MPT_SCSI_DEV;
 
 #define MPT_SCSI_FROM_PASS_THRU(PassThruPtr) \
@@ -270,6 +271,18 @@ MptScsiControllerStart (
 
   Dev->Signature = MPT_SCSI_DEV_SIGNATURE;
 
+  Status = gBS->OpenProtocol (
+                  ControllerHandle,
+                  &gEfiPciIoProtocolGuid,
+                  (VOID **)&Dev->PciIo,
+                  This->DriverBindingHandle,
+                  ControllerHandle,
+                  EFI_OPEN_PROTOCOL_BY_DRIVER
+                  );
+  if (EFI_ERROR (Status)) {
+    goto Done;
+  }
+
   //
   // Host adapter channel, doesn't exist
   //
@@ -299,6 +312,15 @@ MptScsiControllerStart (
 
 Done:
   if (EFI_ERROR (Status)) {
+    if (Dev->PciIo) {
+      gBS->CloseProtocol (
+             ControllerHandle,
+             &gEfiPciIoProtocolGuid,
+             This->DriverBindingHandle,
+             ControllerHandle
+             );
+    }
+
     FreePool (Dev);
   }
 
@@ -339,6 +361,13 @@ MptScsiControllerStop (
          &Dev->PassThru
          );
 
+  gBS->CloseProtocol (
+         ControllerHandle,
+         &gEfiPciIoProtocolGuid,
+         This->DriverBindingHandle,
+         ControllerHandle
+         );
+
   FreePool (Dev);
 
   return Status;
-- 
2.20.1