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Subject: Re: rtlwifi: rtl8821ae: Fix system lockups on boot
From: Kalle Valo <kvalo@codeaurora.org>
In-Reply-To: <1443804270-3830-1-git-send-email-Larry.Finger@lwfinger.net>
To: Larry Finger <Larry.Finger@lwfinger.net>
Cc: devel@driverdev.osuosl.org, linux-wireless@vger.kernel.org,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Stable <stable@vger.kernel.org>
Message-Id: <20151003064432.1B0BD13FA34@smtp.codeaurora.org> (sfid-20151003_084457_760240_A9440813)
Date: Sat,  3 Oct 2015 06:44:32 +0000 (UTC)
Sender: linux-wireless-owner@vger.kernel.org


> In commit 1277fa2ab2f9 ("rtlwifi: Remove the clear interrupt routine from all
> drivers"), the code that cleared all interrupt enable bits before setting them
> was removed for all PCI drivers. This fixed an issue that caused TX to be
> blocked for 3-5 seconds. On some RTL8821AE units, this change causes soft
> lockups to occur on boot. For that reason, the portion of the earlier commit
> that applied to rtl8821ae is reverted. Kernels 4.1 and newer are affected.
> 
> See http://marc.info/?l=linux-wireless&m=144373370103285&w=2 and
> https://bugzilla.opensuse.org/show_bug.cgi?id=944978 for two cases where
> this regression affected user systems. Note that this bug does not appear on
> any of the developer's setups. For those users whose systems are affected
> by the TX blockage, but do not lock up on boot, a module parameter is added
> to disable the interrupt clear
> 
> Fixes: 1277fa2ab2f9 ("rtlwifi: Remove the clear interrupt routine from all drivers")
> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
> Cc: Stable <stable@vger.kernel.org> [V4.1+]

Thanks, applied to wireless-drivers.git.

Kalle Valo