linux-kernel - Re: [PATCH v2] fusion-mptbase: handle failed allocation for workqueue

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Message-ID: <20160218090043.GQ18134@c203.arch.suse.de>
Date:	Thu, 18 Feb 2016 10:00:43 +0100
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Insu Yun <wuninsu@...il.com>
Cc:	nagalakshmi.nandigama@...gotech.com,
	praveen.krishnamoorthy@...gotech.com,
	sreekanth.reddy@...gotech.com, abhijit.mahajan@...gotech.com,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	yeongjin.jang@...ech.edu, insu@...ech.edu, changwoo@...ech.edu
Subject: Re: [PATCH v2] fusion-mptbase: handle failed allocation for workqueue

On Wed, Feb 17, 2016 at 11:40:59PM -0500, Insu Yun wrote:
> the failure of ioc->reset_work_q is checked,
> but not ioc->fw_event_q.
> 
> Signed-off-by: Insu Yun <wuninsu@...il.com>
> ---
>  drivers/message/fusion/mptbase.c | 44 ++++++++++++++++++++++++----------------
>  1 file changed, 27 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
> index 5dcc031..53a5015 100644
> --- a/drivers/message/fusion/mptbase.c
> +++ b/drivers/message/fusion/mptbase.c
> @@ -1871,9 +1871,8 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
>  	if (!ioc->reset_work_q) {
>  		printk(MYIOC_s_ERR_FMT "Insufficient memory to add adapter!\n",
>  		    ioc->name);
> -		pci_release_selected_regions(pdev, ioc->bars);
> -		kfree(ioc);
> -		return -ENOMEM;
> +		r = -ENOMEM;
> +		goto err3;
>  	}
>  
>  	dinitprintk(ioc, printk(MYIOC_s_INFO_FMT "facts @ %p, pfacts[0] @ %p\n",
> @@ -1996,24 +1995,16 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
>  	snprintf(ioc->fw_event_q_name, MPT_KOBJ_NAME_LEN, "mpt/%d", ioc->id);
>  	ioc->fw_event_q = create_singlethread_workqueue(ioc->fw_event_q_name);
>  
> +	if (!ioc->fw_event_q) {
> +		r = -ENOMEM;
> +		goto err2;
> +	}
> +
>  	if ((r = mpt_do_ioc_recovery(ioc, MPT_HOSTEVENT_IOC_BRINGUP,
>  	    CAN_SLEEP)) != 0){
>  		printk(MYIOC_s_ERR_FMT "didn't initialize properly! (%d)\n",
>  		    ioc->name, r);
> -
> -		list_del(&ioc->list);
> -		if (ioc->alt_ioc)
> -			ioc->alt_ioc->alt_ioc = NULL;
> -		iounmap(ioc->memmap);
> -		if (r != -5)
> -			pci_release_selected_regions(pdev, ioc->bars);
> -
> -		destroy_workqueue(ioc->reset_work_q);
> -		ioc->reset_work_q = NULL;
> -
> -		kfree(ioc);
> -		pci_set_drvdata(pdev, NULL);
> -		return r;
> +		goto err1;
>  	}
>  
>  	/* call per device driver probe entry point */
> @@ -2040,6 +2031,25 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
>  			msecs_to_jiffies(MPT_POLLING_INTERVAL));
>  
>  	return 0;
> +
> +err1:
> +		destroy_workqueue(ioc->fw_event_q);
> +		ioc->fw_event_q = NULL;
> +err2::
> +		destroy_workqueue(ioc->reset_work_q);
> +		ioc->reset_work_q = NULL;
> +
> +		list_del(&ioc->list);
> +		if (ioc->alt_ioc)
> +			ioc->alt_ioc->alt_ioc = NULL;
> +		iounmap(ioc->memmap);
> +		pci_set_drvdata(pdev, NULL);
> +err3:
> +		if (r != -5)
> +			pci_release_selected_regions(pdev, ioc->bars);
> +		kfree(ioc);
> +		return r;
> +
>  }

Please no. Not err1, err2 and err3.

err1 could be "goto destroy_fw_event_q", err2 "destroy_reset_workq", err3
goto "free_ioc".

>  
>  /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
> -- 
> 1.9.1
> 
> --
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-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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