Re: [dpdk-dev] [PATCH v3] lib/librte_timer:fix corruption with reset

[Stephen Hemminger <stephen@networkplumber.org>]

On Fri, 10 Jul 2020 11:59:54 +0500
Sarosh Arif <sarosh.arif@emumba.com> wrote:

> If the user tries to reset/stop some other timer in it's callback
> function, which is also about to expire, using 
> rte_timer_reset_sync/rte_timer_stop_sync the application goes into
> an infinite loop. This happens because 
> rte_timer_reset_sync/rte_timer_stop_sync loop until the timer 
> resets/stops and there is check inside timer_set_config_state which
> prevents a running timer from being reset/stopped by not it's own 
> timer_cb. Therefore timer_set_config_state returns -1 due to which 
> rte_timer_reset returns -1 and rte_timer_reset_sync goes into an 
> infinite loop. 
> 
> The soloution to this problem is to return -1 from 
> rte_timer_reset_sync/rte_timer_stop_sync in case the user tries to 
> reset/stop some other timer in it's callback function.
> 
> Bugzilla ID: 491
> Fixes: 20d159f20543 ("timer: fix corruption with reset")
> Cc: h.mikita89@gmail.com
> Signed-off-by: Sarosh Arif <sarosh.arif@emumba.com>
> ---
> v2: remove line continuations
> v3: separate code and declarations

If you want to change the return value, you need to go through the steps
in the API/ABI policy. Maybe even symbol versioning.

Sorry, I know it is painful but we committed to the rules.
And changing the return value can never go to stable.