[PATCH v2 3/6] efi/runtime-wrappers: check EFI_RUNTIME_SERVICES before using efi_rts_work

[Breno Leitao <leitao@debian.org>]

Move the EFI_RUNTIME_SERVICES check to the top of __efi_queue_work() and
return directly, so a caller that finds runtime services disabled returns
without touching the shared efi_rts_work. No functional change.

This prepares for bounding the wait, where a timeout will clear
EFI_RUNTIME_SERVICES while the leaked worker still owns efi_rts_work; a
later caller must then bail out before reinitialising it.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 drivers/firmware/efi/runtime-wrappers.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
index ebeec87ed0b0a..0cd350760446c 100644
--- a/drivers/firmware/efi/runtime-wrappers.c
+++ b/drivers/firmware/efi/runtime-wrappers.c
@@ -320,17 +320,16 @@ static void __nocfi efi_call_rts(struct work_struct *work)
 static efi_status_t __efi_queue_work(enum efi_rts_ids id,
 				     union efi_rts_args *args)
 {
+	if (!efi_enabled(EFI_RUNTIME_SERVICES)) {
+		pr_warn_once("EFI Runtime Services are disabled!\n");
+		return EFI_DEVICE_ERROR;
+	}
+
 	efi_rts_work.efi_rts_id = id;
 	efi_rts_work.args = args;
 	efi_rts_work.caller = __builtin_return_address(0);
 	efi_rts_work.status = EFI_ABORTED;
 
-	if (!efi_enabled(EFI_RUNTIME_SERVICES)) {
-		pr_warn_once("EFI Runtime Services are disabled!\n");
-		efi_rts_work.status = EFI_DEVICE_ERROR;
-		goto exit;
-	}
-
 	init_completion(&efi_rts_work.efi_rts_comp);
 	INIT_WORK(&efi_rts_work.work, efi_call_rts);
 

-- 
2.53.0-Meta