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netdev: Don't divide by zero when "linux-htb" zero min-rate is used

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A "min-rate" of zero for the "linux-htb" QoS type would cause a divide
by zero exception.  This patch prevents that by just returning zero.  A
later patch will try to enforce reasonable values for "min-rate".

Bug #3745
This commit is contained in:
Justin Pettit
2010-10-08 13:50:16 -07:00
parent 5db39d100c
commit 015c93a49a
1 changed files with 2 additions and 4 deletions
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6
lib/netdev-linux.c
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@@ -2938,7 +2938,7 @@ tc_bytes_to_ticks(unsigned int rate, unsigned int size)
if (!buffer_hz) {
read_psched();
}
return ((unsigned long long int) ticks_per_s * size) / rate;
return rate ? ((unsigned long long int) ticks_per_s * size) / rate : 0;
}
/* Returns the number of bytes that need to be reserved for qdisc buffering at
@@ -3284,9 +3284,7 @@ tc_put_rtab(struct ofpbuf *msg, uint16_t type, const struct tc_ratespec *rate)
/* Calculates the proper value of 'buffer' or 'cbuffer' in HTB options given a
* rate of 'Bps' bytes per second, the specified 'mtu', and a user-requested
* burst size of 'burst_bytes'. (If no value was requested, a 'burst_bytes' of
* 0 is fine.)
*
* This */
* 0 is fine.) */
static int
tc_calc_buffer(unsigned int Bps, int mtu, uint64_t burst_bytes)
{