linux-kernel - Re: [mac80211] BUG: unable to handle kernel paging request at 6b6b6b8f

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Date:	Fri, 24 Jan 2014 13:17:50 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [mac80211] BUG: unable to handle kernel paging request at
 6b6b6b8f

On Fri, 2014-01-24 at 20:08 +0800, Fengguang Wu wrote:
> Hi Johannes,
> 
> The BUG does not show up in linux-next 20140124, is it fixed now?

It isn't in linux-next yet I believe (mac80211-next isn't in there), but
yeah, I fixed it already, ran into it myself yesterday. Hope it didn't
cause you too much trouble. The problem was that I misplaced some code
because I didn't notice that the if () condition (see below) had no
braces.

I replaced that commit with
commit 091a69f86862454c282d4a64c9d66074e60514ea
Author: Johannes Berg <johannes.berg@...el.com>
Date:   Wed Jan 22 10:36:59 2014 +0100

    mac80211: remove module handling from rate control ops

which now contains this change

        list_for_each_entry(alg, &rate_ctrl_algs, list) {
-               if (!strcmp(alg->ops->name, name))
-                       if (try_module_get(alg->ops->module)) {
-                               ops = alg->ops;
-                               break;
-                       }
+               if (!strcmp(alg->ops->name, name)) {
+                       ops = alg->ops;
+                       break;
+               }
        }

(note the new set of braces added around the content of the strcmp if)

Sorry!

johannes


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