linux-kernel - Re: [PATCH] Fix termination state for idr_for_each_entry

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Date:   Thu, 26 Oct 2023 09:22:07 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     NeilBrown <neilb@...e.de>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Chris Mi <chrism@...lanox.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH] Fix termination state for idr_for_each_entry_ul()

On Tue, 2023-10-24 at 09:53 +1100, NeilBrown wrote:
> The comment for idr_for_each_entry_ul() states
> 
>   after normal termination @entry is left with the value NULL
> 
> This is not correct in the case where UINT_MAX has an entry in the idr.
> In that case @entry will be non-NULL after termination.
> No current code depends on the documentation being correct, but to
> save future code we should fix it.
> 
> Also fix idr_for_each_entry_continue_ul().  While this is not documented
> as leaving @entry as NULL, the mellanox driver appears to depend on
> it doing so.  So make that explicit in the documentation as well as in
> the code.
> 
> Fixes: e33d2b74d805 ("idr: fix overflow case for idr_for_each_entry_ul()")
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Chris Mi <chrism@...lanox.com>
> Cc: Cong Wang <xiyou.wangcong@...il.com>
> Signed-off-by: NeilBrown <neilb@...e.de>

Since the affected user is in the netdev tree, I think we can take this
patch. But this is also a sort of gray area of the tree... @Matthew are
you ok with that?

Thanks,

Paolo