linux-kernel - Re: [PATCH v7 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

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Date:   Tue, 11 Jun 2019 11:53:52 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen@....com" <peter.chen@....com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: Re: [PATCH v7 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

Hi Pawel,

On Mon, Jun 10, 2019 at 06:33:29AM +0000, Pawel Laszczak wrote:
> >> +static ssize_t cdns3_mode_write(struct file *file,
> >> +				const char __user *ubuf,
> >> +				size_t count, loff_t *ppos)
> >> +{
> >> +	struct seq_file	 *s = file->private_data;
> >> +	struct cdns3 *cdns = s->private;
> >> +	u32 mode = USB_DR_MODE_UNKNOWN;
> >> +	char buf[32];
> >> +	int ret = 0;
> >
> >        int ret;
> >
> >> +	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
> >> +		return -EFAULT;
> >
> >                return -EINVAL;
> 
> Why? I've checked in some place in kernel and after copy_from_user are used EFAULT.
> I think that EINVAL is better but I wanted be  consistent with the rest of kernel. 
> 
> Is there any explanation for this ?

No. You are correct. EFAULT seems to be used with copy_from_user().

thanks,

-- 
heikki