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Message-ID: <YrFr3s50ZMD1Et9W@hovoldconsulting.com>
Date: Tue, 21 Jun 2022 08:57:34 +0200
From: Johan Hovold <johan@...nel.org>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: frank zago <frank@...o.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Wolfram Sang <wsa@...nel.org>, USB <linux-usb@...r.kernel.org>,
Lee Jones <lee.jones@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
linux-i2c <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v6 2/4] gpio: ch341: add GPIO MFD cell driver for the
CH341
On Mon, Jun 20, 2022 at 06:08:19PM +0200, Andy Shevchenko wrote:
> On Mon, Jun 20, 2022 at 12:26 PM Johan Hovold <johan@...nel.org> wrote:
> > On Wed, Jun 15, 2022 at 08:37:45PM -0500, frank zago wrote:
>
> ...
>
> > > + /* Create an URB for handling interrupt */
> > > + dev->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
> > > + if (!dev->irq_urb)
> > > + return dev_err_probe(&pdev->dev, -ENOMEM, "Cannot allocate the int URB\n");
> >
> > This isn't how dev_err_probe() is used.
>
> While I agree on the below comment, what does this imply?
That you should only use dev_err_probe() to handle -EPROBE_DEFER. That's
what it is was added for, documented as, and it is what the
implementation still tells you.
I see now that there has recently been some mission creep:
7065f92255bb ("driver core: Clarify that dev_err_probe() is OK even w/out -EPROBE_DEFER")
I'm not sure I agree with that, but fortunately we don't need to have
that debate in this case due to the below.
> > And allocation failures are already logged so just return -ENOMEM here.
Johan
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