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    SubjectRe: [PATCH] MTD: Deletion of checks before the function call "iounmap"
    On Sun, Jan 18, 2015 at 06:08:12PM +0100, SF Markus Elfring wrote:
    > From: Markus Elfring <>
    > Date: Sun, 18 Jan 2015 17:30:23 +0100
    > The iounmap() function performs also input parameter validation.
    > Thus the test around the call is not needed.

    Is this guaranteed for all arch'es? I expect that it would be, but I see
    that, for instance, ARM allows replaceable iounmap() for
    subarchitectures. Also, I see checks for various sorts of static
    mappings in ARM and x86; these likely (always?) cover the NULL case, but
    they're not always straightforward.

    Anyway, I'm essentially saying that I'd like to be 100% sure we have a
    guarantee before dropping all these.

    > This issue was detected by using the Coccinelle software.

    What script? Hand-rolled I guess?


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