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[efi] Raise TPL during driver unload entry point 

The efi_unload() function is currently missing the calls to raise and
restore the TPL.  This has the side effect of causing iPXE to return
from the driver unload entry point at TPL_CALLBACK, which will cause
unexpected behaviour (typically a system lockup) shortly afterwards.

Fix by adding the missing calls to raise and restore the TPL.

Debugged-by: Petr Borsodi <petr.borsodi@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/522/head
Michael Brown 2021-11-22 12:50:38 +00:00
parent 3ad27fbe78
commit a046da21a4
1 changed files with 7 additions and 0 deletions
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7
src/interface/efi/efi_init.c
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@ -316,9 +316,13 @@ EFI_STATUS efi_init ( EFI_HANDLE image_handle,
static EFI_STATUS EFIAPI efi_unload ( EFI_HANDLE image_handle __unused ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_SYSTEM_TABLE *systab = efi_systab;
struct efi_saved_tpl tpl;
DBGC ( systab, "EFI image unloading\n" );
/* Raise TPL */
efi_raise_tpl ( &tpl );
/* Shut down */
shutdown_exit();
@ -336,6 +340,9 @@ static EFI_STATUS EFIAPI efi_unload ( EFI_HANDLE image_handle __unused ) {
DBGC ( systab, "EFI image unloaded\n" );
/* Restore TPL */
efi_restore_tpl ( &tpl );
return 0;
}