linux-kernel - RE: [PATCH v2] r8152: fix lockup when runtime PM is enabled

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2F8DAD9@RTITMBSV03.realtek.com.tw>
Date:	Tue, 8 Dec 2015 12:39:12 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	Peter Wu <peter@...ensteyn.nl>,
	"David S . Miller" <davem@...emloft.net>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Lu Baolu <baolu.lu@...ux.intel.com>
Subject: RE: [PATCH v2] r8152: fix lockup when runtime PM is enabled

Peter Wu [mailto:peter@...ensteyn.nl]
> Sent: Tuesday, December 08, 2015 7:18 PM
> 
> When an interface is brought up which was previously suspended (via
> runtime PM), it would hang. This happens because napi_disable is called
> before napi_enable.
> 
> Solve this by avoiding napi_enable in the resume during open function
> (netif_running is true when open is called, IFF_UP is set after a
> successful open; netif_running is false when close is called, but IFF_UP
> is then still set).
> 
> While at it, remove WORK_ENABLE check from rtl8152_open (introduced with
> the original change) because it cannot happen:
> 
>  - After this patch, runtime resume will not set it during rtl8152_open.
>  - When link is up, rtl8152_open is not called.
>  - When link is down during system/auto suspend/resume, it is not set.
> 
> Fixes: 41cec84cf285 ("r8152: don't enable napi before rx ready")
> Link: https://lkml.kernel.org/r/20151205105912.GA1766@al
> Signed-off-by: Peter Wu <peter@...ensteyn.nl>
> ---
>  v2: moved rtl_runtime_suspend_enable from close to rtl8152_suspend

Acked-by: Hayes Wang <hayeswang@...ltek.com>

Best Regards,
Hayes

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