netdev - Re: [patch net-next v2] devlink: remove reload failed checks in params get/set callbacks

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Message-ID: <ZK/rlALBlXUELycx@shredder>
Date: Thu, 13 Jul 2023 15:18:28 +0300
From: Ido Schimmel <idosch@...dia.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, moshe@...dia.com
Subject: Re: [patch net-next v2] devlink: remove reload failed checks in
 params get/set callbacks

On Thu, Jul 13, 2023 at 11:44:19AM +0200, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.com>
> 
> The checks in question were introduced by:
> commit 6b4db2e528f6 ("devlink: Fix use-after-free after a failed reload").
> That fixed an issue of reload with mlxsw driver.
> 
> Back then, that was a valid fix, because there was a limitation
> in place that prevented drivers from registering/unregistering params
> when devlink instance was registered.
> 
> It was possible to do the fix differently by changing drivers to
> register/unregister params in appropriate places making sure the ops
> operate only on memory which is allocated and initialized. But that,
> as a dependency, would require to remove the limitation mentioned above.
> 
> Eventually, this limitation was lifted by:
> commit 1d18bb1a4ddd ("devlink: allow registering parameters after the instance")
> 
> Also, the alternative fix (which also fixed another issue) was done by:
> commit 74cbc3c03c82 ("mlxsw: spectrum_acl_tcam: Move devlink param to TCAM code").
> 
> Therefore, the checks are no longer relevant. Each driver should make
> sure to have the params registered only when the memory the ops
> are working with is allocated and initialized.
> 
> So remove the checks.
> 
> Signed-off-by: Jiri Pirko <jiri@...dia.com>

Reviewed-by: Ido Schimmel <idosch@...dia.com>