linux-kernel - Re: [PATCH] drivers:uio: Fix system crashes during driver switchover

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Message-ID: <YnuLXTu1wXvCbP/x@kroah.com>
Date:   Wed, 11 May 2022 12:09:33 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "zhanghongtao (A)" <zhanghongtao22@...wei.com>
Cc:     akpm@...ux-foundation.org, linfeilong@...wei.com,
        suweifeng1@...wei.com, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org
Subject: Re: [PATCH] drivers:uio: Fix system crashes during driver switchover

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Wed, May 11, 2022 at 04:51:11PM +0800, zhanghongtao (A) wrote:
> Thanks for your reply.
> I looked through the historical emails and thought I was not the
> same problem as his.
> After the driver is switched, the application can still operate
> on the mapped address, which causes the system to crash.
> The application is not aware of the driver's switchover.
> The solution I can think of is to block the switch and wait for
> the application to release before switching, as shown in the patch.
> So want to seek help from the community, how to solve it better?
> Is there a better way?

A better way to do what?  I have no context here at all, sorry.

What is "switching" the driver?  If it is root by doing a bind/unbind,
then you are on your own and have to do that very carefully, right?

thanks,

greg k-h