dtlk: off by one in {read,write}_tts()

With a postfix increment retries is incremented beyond DTLK_MAX_RETRIES so
the error message is not displayed correctly.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: James R. Van Zandt <jrv@vanzandt.mv.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
index 6b900b297cc6..52e06589821d 100644
--- a/drivers/char/dtlk.c
+++ b/drivers/char/dtlk.c
@@ -571,7 +571,7 @@ static char dtlk_read_tts(void)
                 portval = inb_p(dtlk_port_tts);
         } while ((portval & TTS_READABLE) == 0 &&
                  retries++ < DTLK_MAX_RETRIES);
-        if (retries == DTLK_MAX_RETRIES)
+        if (retries > DTLK_MAX_RETRIES)
                 printk(KERN_ERR "dtlk_read_tts() timeout\n");
 
         ch = inb_p(dtlk_port_tts);      /* input from TTS port */
@@ -583,7 +583,7 @@ static char dtlk_read_tts(void)
                 portval = inb_p(dtlk_port_tts);
         } while ((portval & TTS_READABLE) != 0 &&
                  retries++ < DTLK_MAX_RETRIES);
-        if (retries == DTLK_MAX_RETRIES)
+        if (retries > DTLK_MAX_RETRIES)
                 printk(KERN_ERR "dtlk_read_tts() timeout\n");
 
         TRACE_RET;
@@ -640,7 +640,7 @@ static char dtlk_write_tts(char ch)
                 while ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0 &&
                        retries++ < DTLK_MAX_RETRIES)    /* DT ready? */
                         ;
-        if (retries == DTLK_MAX_RETRIES)
+        if (retries > DTLK_MAX_RETRIES)
                 printk(KERN_ERR "dtlk_write_tts() timeout\n");
 
         outb_p(ch, dtlk_port_tts);      /* output to TTS port */