[PATCH] rate limiting for the ldisc open faulure messages

[Akinobu Mita <mita@miraclelinux.com>]

This patch limits the messages when ldisc open faulures happen.
It happens under memory pressure.

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>

 drivers/char/tty_io.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: work-shouldfail/drivers/char/tty_io.c
===================================================================
--- work-shouldfail.orig/drivers/char/tty_io.c
+++ work-shouldfail/drivers/char/tty_io.c
@@ -2072,8 +2072,9 @@ fail_no_mem:
 
 	/* call the tty release_mem routine to clean out this slot */
 release_mem_out:
-	printk(KERN_INFO "init_dev: ldisc open failed, "
-			 "clearing slot %d\n", idx);
+	if (printk_ratelimit())
+		printk(KERN_INFO "init_dev: ldisc open failed, "
+				 "clearing slot %d\n", idx);
 	release_mem(tty, idx);
 	goto end_init;
 }