Re: [PATCH v2 03/28] soc: fsl: cpm1: qmc: Fix rx channel reset

[Christophe Leroy]

Le 26/07/2023 à 17:01, Herve Codina a écrit :
> The qmc_chan_reset_rx() set the is_rx_stopped flag. This leads to an
> inconsistent state in the following sequence.
>      qmc_chan_stop()
>      qmc_chan_reset()
> Indeed, after the qmc_chan_reset() call, the channel must still be
> stopped. Only a qmc_chan_start() call can move the channel from stopped
> state to started state.
> 
> Fix the issue removing the is_rx_stopped flag setting from
> qmc_chan_reset()
> 
> Fixes: 3178d58e0b97 ("soc: fsl: cpm1: Add support for QMC")
> Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>

Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>

> ---
>   drivers/soc/fsl/qe/qmc.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
> index 7ad0d77f1740..8dc73cc1a83b 100644
> --- a/drivers/soc/fsl/qe/qmc.c
> +++ b/drivers/soc/fsl/qe/qmc.c
> @@ -685,7 +685,6 @@ static void qmc_chan_reset_rx(struct qmc_chan *chan)
>   		    qmc_read16(chan->s_param + QMC_SPE_RBASE));
>   
>   	chan->rx_pending = 0;
> -	chan->is_rx_stopped = false;
>   
>   	spin_unlock_irqrestore(&chan->rx_lock, flags);
>   }