netdev - Re: [STABLE REQUEST] tipc: improve function tipc_wait_for

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Message-ID: <20230314180430.GY9667@google.com>
Date:   Tue, 14 Mar 2023 18:04:30 +0000
From:   Lee Jones <lee@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Tung Nguyen <tung.q.nguyen@...tech.com.au>, stable@...r.kernel.org,
        davem@...emloft.net, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net
Subject: Re: [STABLE REQUEST] tipc: improve function tipc_wait_for_cond()

On Tue, 14 Mar 2023, Greg KH wrote:

> On Tue, Mar 14, 2023 at 05:45:37PM +0000, Lee Jones wrote:
> > Dear Stable,
> >
> > > Commit 844cf763fba6 ("tipc: make macro tipc_wait_for_cond() smp safe")
> > > replaced finish_wait() with remove_wait_queue() but still used
> > > prepare_to_wait(). This causes unnecessary conditional
> > > checking  before adding to wait queue in prepare_to_wait().
> > >
> > > This commit replaces prepare_to_wait() with add_wait_queue()
> > > as the pair function with remove_wait_queue().
> > >
> > > Acked-by: Ying Xue <ying.xue@...driver.com>
> > > Acked-by: Jon Maloy <jon.maloy@...csson.com>
> > > Signed-off-by: Tung Nguyen <tung.q.nguyen@...tech.com.au>
> > > ---
> > >  net/tipc/socket.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/net/tipc/socket.c b/net/tipc/socket.c
> > > index 1217c90a363b..81b87916a0eb 100644
> > > --- a/net/tipc/socket.c
> > > +++ b/net/tipc/socket.c
> > > @@ -388,7 +388,7 @@ static int tipc_sk_sock_err(struct socket *sock, long *timeout)
> > >  		rc_ = tipc_sk_sock_err((sock_), timeo_);		       \
> > >  		if (rc_)						       \
> > >  			break;						       \
> > > -		prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE);    \
> > > +		add_wait_queue(sk_sleep(sk_), &wait_);                         \
> > >  		release_sock(sk_);					       \
> > >  		*(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
> > >  		sched_annotate_sleep();				               \
> >
> > Could we have this ol' classic backported to v4.19 and v4.14 please?
>
> What is the git commit id?

Sorry, it's 223b7329ec6a0.

--
Lee Jones [李琼斯]