netdev - Re: [PATCH net] mlxsw: __mlxsw_sp_port_headroom

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Date:   Sun, 17 Feb 2019 10:14:40 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     idosch@...lanox.com
Cc:     netdev@...r.kernel.org, jiri@...lanox.com, petrm@...lanox.com,
        mlxsw@...lanox.com
Subject: Re: [PATCH net] mlxsw: __mlxsw_sp_port_headroom_set(): Fix a use
 of local variable

From: Ido Schimmel <idosch@...lanox.com>
Date: Sun, 17 Feb 2019 07:18:41 +0000

> From: Petr Machata <petrm@...lanox.com>
> 
> The function-local variable "delay" enters the loop interpreted as delay
> in bits. However, inside the loop it gets overwritten by the result of
> mlxsw_sp_pg_buf_delay_get(), and thus leaves the loop as quantity in
> cells. Thus on second and further loop iterations, the headroom for a
> given priority is configured with a wrong size.
> 
> Fix by introducing a loop-local variable, delay_cells. Rename thres to
> thres_cells for consistency.
> 
> Fixes: f417f04da589 ("mlxsw: spectrum: Refactor port buffer configuration")
> Signed-off-by: Petr Machata <petrm@...lanox.com>
> Acked-by: Jiri Pirko <jiri@...lanox.com>
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>

Applied and queued up for -stable, thanks Ido.