UBIFS: fix integer overflow warning

Fix the following warning:

fs/ubifs/io.c: In function 'ubifs_wbuf_init':
fs/ubifs/io.c:860: warning: integer overflow in expression

And limit maximum hrtimer delta to ULONG_MAX because the
argument is 'unsigned long'.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index bc5857199ec2..2d41ae1d6607 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -857,7 +857,9 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
          * and hard limits.
          */
         hardlimit = ktime_set(DEFAULT_WBUF_TIMEOUT_SECS, 0);
-        wbuf->delta = (DEFAULT_WBUF_TIMEOUT_SECS * NSEC_PER_SEC) * 2 / 10;
+        wbuf->delta = DEFAULT_WBUF_TIMEOUT_SECS * 1000000000ULL * 2 / 10;
+        if (wbuf->delta > ULONG_MAX)
+                wbuf->delta = ULONG_MAX;
         wbuf->softlimit = ktime_sub_ns(hardlimit, wbuf->delta);
         hrtimer_set_expires_range_ns(&wbuf->timer,  wbuf->softlimit,
                                      wbuf->delta);