linux-kernel - Question about dynamic minor number of misc device

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Message-ID: <CAFH1YnOad7aVjoX_PR6mLqT=pXQjpBW9ZDHkKYzNkeistFkA4A@mail.gmail.com>
Date:   Mon, 20 Jan 2020 16:33:42 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Question about dynamic minor number of misc device

Hi Maintainers,

I see there are 64 free slots(0-63) used for misc devices with dynamic
minor number. But PSMOUSE_MINOR(1) overlaps with that dynamic range.

So if the dynamic minor number exhaust, psaux driver will fail with
"could not register psaux device, error: -16", is this expected?
Should we preserve a slot for psaux and serio_raw which use static
minor number PSMOUSE_MINOR?

Thanks
Zhenzhong