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Raise TPL to prevent the BlockIo instance for USB device is removed during the locating the instance and using it. 

Signed-off-by: niruiyu
Reviewed-by: erictian

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12203 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
niruiyu 2011-08-25 03:55:39 +00:00
parent 670a64e7b7
commit ef949581ea
1 changed files with 11 additions and 0 deletions
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11
IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c
View File

@ -1904,6 +1904,7 @@ BdsLibGetBootableHandle (
)
{
EFI_STATUS Status;
EFI_TPL OldTpl;
EFI_DEVICE_PATH_PROTOCOL *UpdatedDevicePath;
EFI_DEVICE_PATH_PROTOCOL *DupDevicePath;
EFI_HANDLE Handle;
@ -1923,6 +1924,12 @@ BdsLibGetBootableHandle (
UpdatedDevicePath = DevicePath;
//
// Enter to critical section to protect the acquired BlockIo instance
// from getting released due to the USB mass storage hotplug event
//
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
//
// Check whether the device is connected
//
@ -1950,6 +1957,8 @@ BdsLibGetBootableHandle (
// Get BlockIo protocol and check removable attribute
//
Status = gBS->HandleProtocol (Handle, &gEfiBlockIoProtocolGuid, (VOID **)&BlockIo);
ASSERT_EFI_ERROR (Status);
//
// Issue a dummy read to the device to check for media change.
// When the removable media is changed, any Block IO read/write will
@ -2046,6 +2055,8 @@ BdsLibGetBootableHandle (
FreePool(SimpleFileSystemHandles);
}
gBS->RestoreTPL (OldTpl);
return ReturnHandle;
}