From: Johannes Berg <johannes@sipsolutions.net>
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Wey-Yi Guy <wey-yi.w.guy@intel.com>,
Reinette Chatre <reinette.chatre@intel.com>,
"John W. Linville" <linville@tuxdriver.com>,
linux-wireless@vger.kernel.org
Subject: Re: [PATCH 04/13] iwlwifi: cancel scan when down the device
Date: Fri, 03 Sep 2010 14:07:20 +0200 [thread overview]
Message-ID: <1283515640.4700.1.camel@jlt3.sipsolutions.net> (raw)
In-Reply-To: <1283515056-11523-5-git-send-email-sgruszka@redhat.com>
On Fri, 2010-09-03 at 13:57 +0200, Stanislaw Gruszka wrote:
> Always cancel scan when stooping device and scan is currently pending,
> we should newer have scan running after down device.
>
> To assure we start scan cancel from restart work we have to schedule
> abort_scan to different workqueue than priv->workqueue.
Hmmm...
> --- a/drivers/net/wireless/iwlwifi/iwl-agn.c
> +++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
> @@ -2875,8 +2875,9 @@ static void __iwl_down(struct iwl_priv *priv)
>
> IWL_DEBUG_INFO(priv, DRV_NAME " is going down\n");
>
> - if (!exit_pending)
> - set_bit(STATUS_EXIT_PENDING, &priv->status);
> + iwl_scan_cancel_timeout(priv, 200);
This introduces a locking issue, because iwl_scan_cancel_timeout() drops
the mutex. I suspect you fix that later though, but for example the
restart work uses the mutex to atomically track a few BT related
variables.
johannes
next prev parent reply other threads:[~2010-09-03 12:07 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 11:57 [PATCH 0/13] iwlwifi: rewrite iwl-scan.c to avoid race conditions Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 01/13] iwlwifi: remove unused conf variables Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 02/13] iwlwifi: unify scan start checks Stanislaw Gruszka
2010-09-03 14:23 ` Guy, Wey-Yi
2010-09-03 14:25 ` Berg, Johannes
2010-09-06 7:30 ` Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 03/13] iwlwifi: move scan completed flags handling Stanislaw Gruszka
2010-09-03 14:29 ` Guy, Wey-Yi
2010-09-03 14:31 ` Berg, Johannes
2010-09-03 11:57 ` [PATCH 04/13] iwlwifi: cancel scan when down the device Stanislaw Gruszka
2010-09-03 12:07 ` Johannes Berg [this message]
2010-09-03 14:38 ` Guy, Wey-Yi
2010-09-06 7:32 ` Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 05/13] iwlwifi: use IWL_DEBUG_SCAN Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 06/13] iwlwifi: report scan completion when abort fail Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 07/13] iwlwifi: do not queue abort_scan work if can sleep Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 08/13] iwlwifi: avoid dropping muttex in iwl_scan_cancel_timeout Stanislaw Gruszka
2010-09-03 14:53 ` Guy, Wey-Yi
2010-09-06 7:33 ` Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 09/13] iwlwifi: rewrite scan completion Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 10/13] iwlwifi: force scan complete after timeout Stanislaw Gruszka
2010-09-03 12:15 ` Johannes Berg
2010-09-03 11:57 ` [PATCH 11/13] iwlwifi: assure we complete scan in scan_abort and scan_check works Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 12/13] iwlwifi: do not force complete scan too early Stanislaw Gruszka
2010-09-03 11:57 ` [PATCH 13/13] mac80211: wait for scan work complete before restarting hw Stanislaw Gruszka
2010-09-03 12:21 ` [PATCH 0/13] iwlwifi: rewrite iwl-scan.c to avoid race conditions Johannes Berg
2010-09-03 12:55 ` Stanislaw Gruszka
2010-09-03 13:11 ` Johannes Berg
2010-09-03 15:04 ` Guy, Wey-Yi
2010-09-06 7:37 ` Stanislaw Gruszka
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