linux-kernel - RE: [PATCH v8 01/20] dlb: add skeleton for DLB driver

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Date:   Sat, 9 Jan 2021 06:09:18 +0000
From:   "Chen, Mike Ximing" <mike.ximing.chen@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>
Subject: RE: [PATCH v8 01/20] dlb: add skeleton for DLB driver



> -----Original Message-----
> From: Greg KH <gregkh@...uxfoundation.org>
> Sent: Thursday, January 7, 2021 2:36 PM
> To: Chen, Mike Ximing <mike.ximing.chen@...el.com>
> Cc: linux-kernel@...r.kernel.org; arnd@...db.de; Williams, Dan J
> <dan.j.williams@...el.com>; pierre-louis.bossart@...ux.intel.com; Gage Eads
> <gage.eads@...el.com>
> Subject: Re: [PATCH v8 01/20] dlb: add skeleton for DLB driver
> 
> On Mon, Jan 04, 2021 at 08:58:20PM -0600, Mike Ximing Chen wrote:
> > +static int dlb_probe(struct pci_dev *pdev,
> > +		     const struct pci_device_id *pdev_id)
> > +{
> > +	struct dlb *dlb;
> > +	int ret;
> > +
> > +	dlb = devm_kzalloc(&pdev->dev, sizeof(*dlb), GFP_KERNEL);
> > +	if (!dlb)
> > +		return -ENOMEM;
> > +
> > +	pci_set_drvdata(pdev, dlb);
> > +
> > +	dlb->pdev = pdev;
> > +
> > +	spin_lock(&dlb_ids_lock);
> > +	dlb->id = idr_alloc(&dlb_ids,
> > +			    (void *)dlb,
> > +			    0,
> > +			    DLB_MAX_NUM_DEVICES - 1,
> > +			    GFP_KERNEL);
> > +	spin_unlock(&dlb_ids_lock);
> > +
> > +	if (dlb->id < 0) {
> > +		dev_err(&pdev->dev, "probe: device ID allocation failed\n");
> > +
> > +		ret = dlb->id;
> > +		goto alloc_id_fail;
> > +	}
> > +
> > +	ret = pcim_enable_device(pdev);
> > +	if (ret != 0) {
> > +		dev_err(&pdev->dev, "pcim_enable_device() returned %d\n", ret);
> > +
> > +		goto pci_enable_device_fail;
> > +	}
> > +
> > +	ret = pcim_iomap_regions(pdev,
> > +				 (1U << DLB_CSR_BAR) | (1U << DLB_FUNC_BAR),
> > +				 "dlb");
> > +	if (ret != 0) {
> > +		dev_err(&pdev->dev,
> > +			"pcim_iomap_regions(): returned %d\n", ret);
> > +
> > +		goto pci_enable_device_fail;
> > +	}
> > +
> > +	pci_set_master(pdev);
> > +
> > +	if (pci_enable_pcie_error_reporting(pdev))
> > +		dev_info(&pdev->dev, "[%s()] Failed to enable AER\n", __func__);
> 
> Shouldn't that be dev_err() and you fail here?
> 
Some of our earlier devices/platforms do not support AER.  pci_enable_pcie_error_reporting() fails, 
everything else works fine. Will change to dev_err() when the old HWs are phased out.

> And no need for __func__ please, the driver name and device is listed,
> that's all that is necessary.

Will remove __func__. 
Thanks

> 
> thanks,
> 
> greg k-h