tipc: Provide feedback when log buffer resizing fails

This patch provides feedback to the user when TIPC is unable
to set its log buffer to the requested size.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 12 insertions, 5 deletions

diff --git a/net/tipc/dbg.c b/net/tipc/dbg.c
index 1a8d0a24d9e3..c6806910598c 100644
--- a/net/tipc/dbg.c
+++ b/net/tipc/dbg.c
@@ -2,7 +2,7 @@
  * net/tipc/dbg.c: TIPC print buffer routines for debugging
  *
  * Copyright (c) 1996-2006, Ericsson AB
- * Copyright (c) 2005-2006, Wind River Systems
+ * Copyright (c) 2005-2007, Wind River Systems
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -354,8 +354,10 @@ void tipc_dump(struct print_buf *pb, const char *fmt, ...)
  * @log_size: print buffer size to use
  */
 
-void tipc_log_resize(int log_size)
+int tipc_log_resize(int log_size)
 {
+        int res = 0;
+
         spin_lock_bh(&print_lock);
         if (TIPC_LOG->buf) {
                 kfree(TIPC_LOG->buf);
@@ -366,8 +368,11 @@ void tipc_log_resize(int log_size)
                         log_size = TIPC_PB_MIN_SIZE;
                 tipc_printbuf_init(TIPC_LOG, kmalloc(log_size, GFP_ATOMIC),
                                    log_size);
+                res = !TIPC_LOG->buf;
         }
         spin_unlock_bh(&print_lock);
+
+        return res;
 }
 
 /**
@@ -385,7 +390,9 @@ struct sk_buff *tipc_log_resize_cmd(const void *req_tlv_area, int req_tlv_space)
         if (value != delimit(value, 0, 32768))
                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
                                                    " (log size must be 0-32768)");
-        tipc_log_resize(value);
+        if (tipc_log_resize(value))
+                return tipc_cfg_reply_error_string(
+                        "unable to create specified log (log size is now 0)");
         return tipc_cfg_reply_none();
 }
 
diff --git a/net/tipc/dbg.h b/net/tipc/dbg.h
index 718a5db245b5..6b00062bf040 100644
--- a/net/tipc/dbg.h
+++ b/net/tipc/dbg.h
@@ -2,7 +2,7 @@
  * net/tipc/dbg.h: Include file for TIPC print buffer routines
  *
  * Copyright (c) 1997-2006, Ericsson AB
- * Copyright (c) 2005-2006, Wind River Systems
+ * Copyright (c) 2005-2007, Wind River Systems
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -61,7 +61,7 @@ int  tipc_printbuf_empty(struct print_buf *pb);
 int  tipc_printbuf_validate(struct print_buf *pb);
 void tipc_printbuf_move(struct print_buf *pb_to, struct print_buf *pb_from);
 
-void tipc_log_resize(int log_size);
+int tipc_log_resize(int log_size);
 
 struct sk_buff *tipc_log_resize_cmd(const void *req_tlv_area,
                                     int req_tlv_space);