linux-kernel - [PATCH] kdb: delete unexecuted if-block in kdb_get_kbd

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Message-ID: <20251003151220.1580-1-matvey.kovalev@ispras.ru>
Date: Fri,  3 Oct 2025 18:12:02 +0300
From: Matvey Kovalev <matvey.kovalev@...ras.ru>
To: Jason Wessel <jason.wessel@...driver.com>
Cc: Matvey Kovalev <matvey.kovalev@...ras.ru>,
	Daniel Thompson <danielt@...nel.org>,
	Douglas Anderson <dianders@...omium.org>,
	kgdb-bugreport@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH] kdb: delete unexecuted if-block in kdb_get_kbd_char()

Bits of scancode are dropped except 7 low-order ones.
So, scancode can't be equal 0xe0.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Matvey Kovalev <matvey.kovalev@...ras.ru>
---
 kernel/debug/kdb/kdb_keyboard.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
index 3a74604fdb8a7..386d30e530b78 100644
--- a/kernel/debug/kdb/kdb_keyboard.c
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -145,9 +145,6 @@ int kdb_get_kbd_char(void)
 		return CTRL('F');
 	}
 
-	if (scancode == 0xe0)
-		return -1;
-
 	/*
 	 * For Japanese 86/106 keyboards
 	 * 	See comment in drivers/char/pc_keyb.c.
-- 
2.43.0.windows.1