linux-kernel - [PATCH v2 4/7] kdb: Merge identical case statements in kdb

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Message-Id: <20240422-kgdb_read_refactor-v2-4-ed51f7d145fe@linaro.org>
Date: Mon, 22 Apr 2024 17:35:57 +0100
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Jason Wessel <jason.wessel@...driver.com>, 
 Douglas Anderson <dianders@...omium.org>
Cc: kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
 Daniel Thompson <daniel.thompson@...aro.org>, stable@...r.kernel.org
Subject: [PATCH v2 4/7] kdb: Merge identical case statements in kdb_read()

The code that handles case 14 (down) and case 16 (up) has been copy and
pasted despite being byte-for-byte identical. Combine them.

Cc: stable@...r.kernel.org # Not a bug fix but it is needed for later bug fixes
Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
---
 kernel/debug/kdb/kdb_io.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 69549fe42e87b..f167894b11b8e 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -298,6 +298,7 @@ static char *kdb_read(char *buffer, size_t bufsize)
 		}
 		break;
 	case 14: /* Down */
+	case 16: /* Up */
 		memset(tmpbuffer, ' ',
 		       strlen(kdb_prompt_str) + (lastchar-buffer));
 		*(tmpbuffer+strlen(kdb_prompt_str) +
@@ -312,15 +313,6 @@ static char *kdb_read(char *buffer, size_t bufsize)
 			++cp;
 		}
 		break;
-	case 16: /* Up */
-		memset(tmpbuffer, ' ',
-		       strlen(kdb_prompt_str) + (lastchar-buffer));
-		*(tmpbuffer+strlen(kdb_prompt_str) +
-		  (lastchar-buffer)) = '\0';
-		kdb_printf("\r%s\r", tmpbuffer);
-		*lastchar = (char)key;
-		*(lastchar+1) = '\0';
-		return lastchar;
 	case 9: /* Tab */
 		if (tab < 2)
 			++tab;

-- 
2.43.0