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authorEric Dumazet <edumazet@google.com>2012-08-09 01:13:53 +0400
committerDavid S. Miller <davem@davemloft.net>2012-08-10 03:17:03 +0400
commita399a8053164ec8bcb06fed52be9941a26ecde11 (patch)
treec60402a77d08c82630d63e972d32b038919b827f /net/bridge/br_stp_timer.c
parent79cda75a107da0d49732b5cb642b456264dd7e0e (diff)
downloadlinux-a399a8053164ec8bcb06fed52be9941a26ecde11.tar.xz
time: jiffies_delta_to_clock_t() helper to the rescue
Various /proc/net files sometimes report crazy timer values, expressed in clock_t units. This happens when an expired timer delta (expires - jiffies) is passed to jiffies_to_clock_t(). This function has an overflow in : return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ); commit cbbc719fccdb8cb (time: Change jiffies_to_clock_t() argument type to unsigned long) only got around the problem. As we cant output negative values in /proc/net/tcp without breaking various tools, I suggest adding a jiffies_delta_to_clock_t() wrapper that caps the negative delta to a 0 value. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Maciej Żenczykowski <maze@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: hank <pyu@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_stp_timer.c')
-rw-r--r--net/bridge/br_stp_timer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
index a6747e673426..c3530a81a33b 100644
--- a/net/bridge/br_stp_timer.c
+++ b/net/bridge/br_stp_timer.c
@@ -170,5 +170,5 @@ void br_stp_port_timer_init(struct net_bridge_port *p)
unsigned long br_timer_value(const struct timer_list *timer)
{
return timer_pending(timer)
- ? jiffies_to_clock_t(timer->expires - jiffies) : 0;
+ ? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0;
}