linux-kernel - Re: [PATCH v3] usb/hcd: Send a uevent signaling that the host controller had died

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Date:   Wed, 17 Apr 2019 16:39:23 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Raul Rangel <rrangel@...omium.org>
cc:     linux-usb@...r.kernel.org, <groeck@...omium.org>,
        <oneukum@...e.com>, <djkurtz@...omium.org>, <zwisler@...omium.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Dmitry Torokhov <dtor@...omium.org>,
        <linux-kernel@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH v3] usb/hcd: Send a uevent signaling that the host
 controller had died

On Wed, 17 Apr 2019, Raul Rangel wrote:

> On Wed, Apr 17, 2019 at 03:14:14PM -0400, Alan Stern wrote:
> > On Wed, 17 Apr 2019, Raul E Rangel wrote:
> > 
> > > +/* Workqueue routine for when the root-hub has died. */
> > > +static void hcd_died_work(struct work_struct *work)
> > > +{
> > > +	struct usb_hcd *hcd = container_of(work, struct usb_hcd, died_work);
> > > +	char *env[] = {
> > > +		"ERROR=DEAD",
> > > +		NULL
> > > +	};
> > 
> > This can now be
> > 
> > 	static const char *env[] = ...
> > 
> > right?  There's no need for the array to be reinitialized every time 
> > the routine runs.
> I originally tried to make it const, but kobject_uevent_env doesn't
> declare the parameter as const, so the compiler yelled at me. I could
> make it static, but a static without a const makes me wary. I can add it
> if you think it's fine.

This sounds like a golden opportunity!  Submit a separate patch making 
the parameter to kobject_uevent_env be const (actually const char * 
const []), then submit this patch on top of that one.

Alan Stern