Messages in this thread | | | Date | Thu, 19 Oct 2023 17:17:41 +0200 | From | Johan Hovold <> | Subject | Re: [PATCH 1/2] wifi: ath11k: fix temperature event locking |
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On Thu, Oct 19, 2023 at 08:04:55AM -0700, Jeff Johnson wrote: > On 10/19/2023 3:42 AM, Johan Hovold wrote: > > The ath11k active pdevs are protected by RCU but the temperature event > > handling code calling ath11k_mac_get_ar_by_pdev_id() was not marked as a > > read-side critical section as reported by RCU lockdep: > > How do I enable this? Just enable CONFIG_PROVE_RCU?
Yeah, via CONFIG_PROVE_LOCKING.
> Of course I'd also need to exercise the code path...
Right, this one I hit when reading out the sensor temperature (e.g. using lm_sensors).
> > + rcu_read_lock(); > > + > > ar = ath11k_mac_get_ar_by_pdev_id(ab, ev->pdev_id); > > if (!ar) { > > ath11k_warn(ab, "invalid pdev id in pdev temperature ev %d", ev->pdev_id); > > aren't you missing an unlock() in this error path? > > perhaps have a goto cleanup that does both the unlock() and the kfree()?
Bah, I am, thanks for catching that.
Spent too much time on scanning for further instances that I didn't check the first one properly. Sorry about that. Will send a v2.
Johan
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