linux-kernel - Re: [PATCH 2/2] android: binder: Don't get mm from task

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Date:   Fri, 20 Oct 2017 15:41:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sherry Yang <sherryy@...roid.com>
Cc:     linux-kernel@...r.kernel.org,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Riley Andrews <riandrews@...roid.com>, maco@...gle.com,
        tkjos@...gle.com
Subject: Re: [PATCH 2/2] android: binder: Don't get mm from task

On Sat, Sep 16, 2017 at 01:11:57AM -0400, Sherry Yang wrote:
> Use binder_alloc struct's mm_struct rather than getting
> a reference to the mm struct through get_task_mm to
> avoid a potential deadlock between lru lock, task lock and
> dentry lock, since a thread can be holding the task lock
> and the dentry lock while trying to acquire the lru lock.
> 
> Acked-by: Arve Hjønnevåg <arve@...roid.com>
> Signed-off-by: Sherry Yang <sherryy@...roid.com>
> ---
>  drivers/android/binder_alloc.c | 22 +++++++++-------------
>  drivers/android/binder_alloc.h |  1 -
>  2 files changed, 9 insertions(+), 14 deletions(-)

This seems to be needed for 4.14-final, so can you refresh it against my
char-misc-linus branch and resend it?

thanks,

greg k-h