linux-kernel - Re: [PATCH 4.19 25/25] Revert "net/mlx5: Annotate mutex destroy for root ns"

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Date:   Thu, 11 Jun 2020 22:17:33 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
        Mark Bloch <markb@...lanox.com>, Roi Dayan <roid@...lanox.com>
Subject: Re: [PATCH 4.19 25/25] Revert "net/mlx5: Annotate mutex destroy for
 root ns"

On Tue, 2020-06-09 at 19:45 +0200, Greg Kroah-Hartman wrote:
> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> This reverts commit 95fde2e46860c183f6f47a99381a3b9bff488bd5 which is
> commit 9ca415399dae133b00273a4283ef31d003a6818d upstream.
> 
> It was backported incorrectly, Paul writes at:
> 	https://lore.kernel.org/r/20200607203425.GD23662@windriver.com
> 
> 	I happened to notice this commit:
> 
> 	9ca415399dae - "net/mlx5: Annotate mutex destroy for root ns"
> 
> 	...was backported to 4.19 and 5.4 and v5.6 in linux-stable.
> 
> 	It patches del_sw_root_ns() - which only exists after v5.7-rc7
> from:
> 
> 	6eb7a268a99b - "net/mlx5: Don't maintain a case of del_sw_func
> being
> 	null"
> 
> 	which creates the one line del_sw_root_ns stub function around
> 	kfree(node) by breaking it out of tree_put_node().
> 
> 	In the absense of del_sw_root_ns - the backport finds an
> identical one
> 	line kfree stub fcn - named del_sw_prio from this earlier
> commit:
> 
> 	139ed6c6c46a - "net/mlx5: Fix steering memory leak"  [in v4.15-
> rc5]
> 
> 	and then puts the mutex_destroy() into that (wrong) function,
> instead of
> 	putting it into tree_put_node where the root ns case used to be
> hand
> 
> Reported-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> Cc: Roi Dayan <roid@...lanox.com>
> Cc: Mark Bloch <markb@...lanox.com>
> Cc: Saeed Mahameed <saeedm@...lanox.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Saeed Mahameed <saeedm@...lanox.com>


I don't know if this was due to something wrong in my backporting
process or AUTOSEL/wrong Fixes tag related. I will check later and will
try my best to avoid this in the future. 

Thanks,
Saeed.