From cbb83c4fcee19d89d7b4927dcad734af02d24f24 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@flatbox.9hal>
Date: Sun, 26 Feb 2012 20:19:58 +0100
Subject: [PATCH] kbdfs: properly handle zero length write to kbdin

---
 sys/src/cmd/aux/kbdfs/kbdfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/src/cmd/aux/kbdfs/kbdfs.c b/sys/src/cmd/aux/kbdfs/kbdfs.c
index 58c4e8bba..90e22484b 100644
--- a/sys/src/cmd/aux/kbdfs/kbdfs.c
+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c
@@ -1114,9 +1114,9 @@ fswrite(Req *r)
 	case Qkbdin:
 		p = r->ifcall.data;
 		n = r->ifcall.count;
-		if(n <= 0)
-			n = 0;
 		r->ofcall.count = n;
+		if(n == 0)
+			break;
 		if(p[n-1] != 0){
 			/*
 			 * old format as used by bitsy keyboard: