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

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Message-ID: <a823c472-7826-3fbd-0197-5246a2cd5368@users.sourceforge.net>
Date:   Wed, 6 Dec 2017 22:33:26 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org
Cc:     Joe Perches <joe@...ches.com>, 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: USB: hub: Delete an error message for a failed memory allocation
 in usb_hub_clear_tt_buffer()

>>> 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.

Do you find a default Linux allocation failure report insufficient then?

Would you like to to achieve that the requested information can be determined
from a backtrace?

Regards,
Markus