linux-kernel - Re: [PATCH] USB: hub: Delete an error message for a failed memory allocation in usb_hub_clear_tt

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Message-ID: <Pine.LNX.4.44L0.1712061618140.1507-100000@iolanthe.rowland.org>
Date:   Wed, 6 Dec 2017 16:18:53 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Joe Perches <joe@...ches.com>
cc:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        <linux-usb@...r.kernel.org>, Daniel Drake <drake@...lessm.com>,
        Dmitry Fleytman <dmitry@...nix.com>,
        Eugene Korenevsky <ekorenevsky@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Günter Röck <linux@...ck-us.net>,
        Johan Hovold <johan@...nel.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Peter Chen <peter.chen@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] USB: hub: Delete an error message for a failed memory
 allocation in usb_hub_clear_tt_buffer()

On Wed, 6 Dec 2017, Joe Perches wrote:

> On Wed, 2017-12-06 at 11:45 -0500, Alan Stern wrote:
> > On Wed, 6 Dec 2017, SF Markus Elfring wrote:
> > > Omit an extra message for a memory allocation failure in this function.
> 
> Markus' typical terrible commit message.
> 
> > > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> []
> > > @@ -829,7 +829,6 @@ int usb_hub_clear_tt_buffer(struct urb *urb)
> > >        */
> > >       clear = kmalloc(sizeof *clear, GFP_ATOMIC);
> > >       if (clear == NULL) {
> > > -             dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
> > >               /* FIXME recover somehow ... RESET_TT? */
> > >               return -ENOMEM;
> > >       }
> > 
> > Does the existing memory allocation error message include the 
> > &udev->dev device name and driver name?  If it doesn't, there will be 
> > no way for the user to tell that the error message is related to the 
> > device failure.
> 
> No, but the effect is similar.
> 
> OOM does a dump_stack() so this function's call tree is shown.

A call stack doesn't tell you which device was being handled.

Alan Stern