linux-kernel - Re: staging: comedi: usbdux: Split a condition check in usbdux_alloc_usb

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Date:   Thu, 8 Dec 2016 16:43:13 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Ian Abbott <abbotti@....co.uk>
Cc:     devel@...verdev.osuosl.org, Chris Cesare <chris.cesare@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: staging: comedi: usbdux: Split a condition check in
 usbdux_alloc_usb_buffers()

> Actually, the original code worked fine,

I got my doubts when some memory allocations are attempted without checking
the desired success immediately.


> and these changes will result in an Oops if the allocations fail.  I'll explain why,
> since it isn't obvious without some knowledge of the clean-up strategy used by comedi drivers:

Thanks for your explanation.


> …, and all the other comedi drivers follow the same strategy of leaving clean-up
> to their comedi 'detach' handler.

Are there other source code parts worth for further considerations?

Regards,
Markus