With the spotlight leaving in_dev_get, we have the parallel question
of in_dev_put() and __in_dev_put() both defined with refcnt
decrement, but the preceding underscore may lend itself to an
inadvertant pairing and refcnt inaccuracy.
In the following cscope of linux-2.6.14-rc2 prior to Herbert's patches
which remove the occurence in pktgen.c and the others are
paired with __in_dev_get_rtnl(), except xfrm4_policy.c():
C symbol: __in_dev_put
File Function Line
File Function Line
0 inetdevice.h <global> 172 #define __in_dev_put(idev) atomic_dec(&(idev)->refcnt)
1 pktgen.c pktgen_setup_inject 1687 __in_dev_put(in_dev);
2 devinet.c inet_rtm_deladdr 412 __in_dev_put(in_dev);
3 igmp.c igmp_gq_timer_expire 686 __in_dev_put(in_dev);
4 igmp.c igmp_ifc_timer_expire 698 __in_dev_put(in_dev);
5 igmp.c igmp_heard_query 801 __in_dev_put(in_dev);
6 igmp.c ip_mc_down 1228 __in_dev_put(in_dev);
7 igmp.c ip_mc_down 1231 __in_dev_put(in_dev);
8 igmp.c ip_mc_find_dev 1310 __in_dev_put(idev);
9 xfrm4_policy.c xfrm4_dst_ifdown 280 __in_dev_put(loopback_idev);
It may not be reasonable to rename __in_dev_put for its parallel definition
since its current usage is with __in_dev_get_rtnl() which does not increment
refcnt.
It is also probably good to retain the old __in_dev_get()
and __in_dev_put() and deprecate them.
Old business: this is probably stating the obvious,
with Herbert's patches in place, none of the test patch
I'd submitted 8 Sept should take effect.
Thank you.
Suzanne
----- Original Message -----
From: "Herbert Xu" <[email protected]>
Sent: Saturday, October 01, 2005 12:12 AM
> On Fri, Sep 30, 2005 at 11:56:41PM -0700, Suzanne Wood wrote:
>>
>> The other thing I'd hoped to address in pktgen.c was
>> removing the __in_dev_put() which decrements refcnt
>> while __in_dev_get_rcu() does not increment.
>
> Well spotted.
>
> Here is a patch on top of the last one to fix this bogus decrement.
>
> Signed-off-by: Herbert Xu <[email protected]>
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