linux-kernel - Re: [PATCH 2/4] tty: atmel_serial: convert tasklets to use new tasklet

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Date:   Wed, 26 Aug 2020 15:29:32 +0200
From:   Richard Genoud <richard.genoud@...il.com>
To:     Allen Pais <allen.cryptic@...il.com>, gregkh@...uxfoundation.org
Cc:     keescook@...omium.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Allen Pais <allen.lkml@...il.com>,
        Romain Perier <romain.perier@...il.com>
Subject: Re: [PATCH 2/4] tty: atmel_serial: convert tasklets to use new
 tasklet_setup() API

Le 17/08/2020 à 10:59, Allen Pais a écrit :
> From: Allen Pais <allen.lkml@...il.com>
> 
> In preparation for unconditionally passing the
> struct tasklet_struct pointer to all tasklet
> callbacks, switch to using the new tasklet_setup()
> and from_tasklet() to pass the tasklet pointer explicitly.
> 
> Signed-off-by: Romain Perier <romain.perier@...il.com>
> Signed-off-by: Allen Pais <allen.lkml@...il.com>
Acked-by: Richard Genoud <richard.genoud@...il.com>

> ---
>  drivers/tty/serial/atmel_serial.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index e43471b33710..a9c47f56e994 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -1722,10 +1722,11 @@ static int atmel_prepare_rx_pdc(struct uart_port *port)
>  /*
>   * tasklet handling tty stuff outside the interrupt handler.
>   */
> -static void atmel_tasklet_rx_func(unsigned long data)
> +static void atmel_tasklet_rx_func(struct tasklet_struct *t)
>  {
> -	struct uart_port *port = (struct uart_port *)data;
> -	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
> +	struct atmel_uart_port *atmel_port = from_tasklet(atmel_port, t,
> +							  tasklet_rx);
> +	struct uart_port *port = &atmel_port->uart;
>  
>  	/* The interrupt handler does not take the lock */
>  	spin_lock(&port->lock);
> @@ -1733,10 +1734,11 @@ static void atmel_tasklet_rx_func(unsigned long data)
>  	spin_unlock(&port->lock);
>  }
>  
> -static void atmel_tasklet_tx_func(unsigned long data)
> +static void atmel_tasklet_tx_func(struct tasklet_struct *t)
>  {
> -	struct uart_port *port = (struct uart_port *)data;
> -	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
> +	struct atmel_uart_port *atmel_port = from_tasklet(atmel_port, t,
> +							  tasklet_tx);
> +	struct uart_port *port = &atmel_port->uart;
>  
>  	/* The interrupt handler does not take the lock */
>  	spin_lock(&port->lock);
> @@ -1911,10 +1913,8 @@ static int atmel_startup(struct uart_port *port)
>  	}
>  
>  	atomic_set(&atmel_port->tasklet_shutdown, 0);
> -	tasklet_init(&atmel_port->tasklet_rx, atmel_tasklet_rx_func,
> -			(unsigned long)port);
> -	tasklet_init(&atmel_port->tasklet_tx, atmel_tasklet_tx_func,
> -			(unsigned long)port);
> +	tasklet_setup(&atmel_port->tasklet_rx, atmel_tasklet_rx_func);
> +	tasklet_setup(&atmel_port->tasklet_tx, atmel_tasklet_tx_func);
>  
>  	/*
>  	 * Initialize DMA (if necessary)
> 

Thanks !