linux-kernel - Re: [PATCH 6/6] drivers/media/dvb-usb-dvb: postpone kfree(mdev)

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Date:	Mon, 21 Mar 2016 21:56:34 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Max Kellermann <max@...mpel.org>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 6/6] drivers/media/dvb-usb-dvb: postpone kfree(mdev)

Hi Max,

[auto build test WARNING on v4.5-rc7]
[cannot apply to sailus-media/master linuxtv-media/master next-20160321]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Max-Kellermann/drivers-media-dvb-core-en50221-move-code-to-dvb_ca_private_free/20160321-213556
config: xtensa-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All warnings (new ones prefixed by >>):

   drivers/media/usb/dvb-usb/dvb-usb-dvb.c: In function 'dvb_usb_media_device_unregister':
>> drivers/media/usb/dvb-usb/dvb-usb-dvb.c:148:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     struct media_device *mdev = adap->dvb_adap.mdev;
     ^

vim +148 drivers/media/usb/dvb-usb/dvb-usb-dvb.c

   132	
   133	static int  dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
   134	{
   135	#ifdef CONFIG_MEDIA_CONTROLLER_DVB
   136		return media_device_register(adap->dvb_adap.mdev);
   137	#else
   138		return 0;
   139	#endif
   140	}
   141	
   142	static void dvb_usb_media_device_unregister(struct dvb_usb_adapter *adap)
   143	{
   144	#ifdef CONFIG_MEDIA_CONTROLLER_DVB
   145		if (!adap->dvb_adap.mdev)
   146			return;
   147	
 > 148		struct media_device *mdev = adap->dvb_adap.mdev;
   149		adap->dvb_adap.mdev = NULL;
   150		media_device_unregister(mdev);
   151		/* media_device_cleanup() and kfree() will be called by the
   152		   callback function dvb_usb_media_device_release() */
   153	#endif
   154	}
   155	
   156	int dvb_usb_adapter_dvb_init(struct dvb_usb_adapter *adap, short *adapter_nums)

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