Re: [PATCH] mac80211: Fix oops in ieee80211_tx_control_port
From: Arend van Spriel <arend.vanspriel@broadcom.com>
Date: 2018-06-20 08:49:12
On 6/20/2018 9:53 AM, Johannes Berg wrote:
On Wed, 2018-06-20 at 09:51 +0200, Arend van Spriel wrote:quoted
On 6/19/2018 5:39 PM, Denis Kenzior wrote:quoted
On pre-emption enabled kernels the following oops was being seen due to missing local_bh_disable/local_bh_enable calls. mac80211 assumes that pre-emption is disabled in the data path.No sure if "assumes" is the right term here. It seems like it is required and there is probably a good reason for that. Would be nice to know what that reason is.It's using per-CPU data.
Hence the smp_processor_id() call which Denis mentioned in the bug report? Regards, Arend