From f03a879d67261b587a88e8e475596c1bbe7e6111 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Sat, 22 Aug 2020 08:29:53 +0200 Subject: [PATCH] efi_loader: ResetSystem() should not hang If ResetSystem() is not implemented at runtime, it should return instead of hanging in an endless loop. This allows the operating system to reset the system by other means as Linux does. It also matches what EDK II suggests in comments for functions ResetShutdown() and ResetWarm() in OvmfPkg/Library/ResetSystemLib/ResetSystemLib.c. Signed-off-by: Heinrich Schuchardt --- lib/efi_loader/efi_runtime.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c index 78fd801..dea2b4e 100644 --- a/lib/efi_loader/efi_runtime.c +++ b/lib/efi_loader/efi_runtime.c @@ -365,7 +365,9 @@ out: * efi_reset_system() - reset system * * This function implements the ResetSystem() runtime service after - * SetVirtualAddressMap() is called. It only executes an endless loop. + * SetVirtualAddressMap() is called. As this placeholder cannot reset the + * system it simply return to the caller. + * * Boards may override the helpers below to implement reset functionality. * * See the Unified Extensible Firmware Interface (UEFI) specification for @@ -381,8 +383,7 @@ void __weak __efi_runtime EFIAPI efi_reset_system( efi_status_t reset_status, unsigned long data_size, void *reset_data) { - /* Nothing we can do */ - while (1) { } + return; } /** -- 2.7.4