linux-kernel - Re: [PATCH v1 1/1] serial: 8250_mid: Balance reference count for PCI DMA device

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Date:   Tue, 15 Feb 2022 11:11:41 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Qing Wang <wangqing@...o.com>
Subject: Re: [PATCH v1 1/1] serial: 8250_mid: Balance reference count for PCI
 DMA device

On 15. 02. 22, 11:09, Andy Shevchenko wrote:
> The pci_get_slot() increases its reference count, the caller
> must decrement the reference count by calling pci_dev_put().

And what about the -EINVAL case?

> Fixes: 90b9aacf912a ("serial: 8250_pci: add Intel Tangier support")
> Fixes: f549e94effa1 ("serial: 8250_pci: add Intel Penwell ports")
> Depends-on: d9eda9bab237 ("serial: 8250_pci: Intel MID UART support to its own driver")
> Reported-by: Qing Wang <wangqing@...o.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/tty/serial/8250/8250_mid.c | 19 +++++++++++++++----
>   1 file changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
> index efa0515139f8..e6c1791609dd 100644
> --- a/drivers/tty/serial/8250/8250_mid.c
> +++ b/drivers/tty/serial/8250/8250_mid.c
> @@ -73,6 +73,11 @@ static int pnw_setup(struct mid8250 *mid, struct uart_port *p)
>   	return 0;
>   }
>   
> +static void pnw_exit(struct mid8250 *mid)
> +{
> +	pci_dev_put(mid->dma_dev);
> +}
> +
>   static int tng_handle_irq(struct uart_port *p)
>   {
>   	struct mid8250 *mid = p->private_data;
> @@ -124,6 +129,11 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p)
>   	return 0;
>   }
>   
> +static void tng_exit(struct mid8250 *mid)
> +{
> +	pci_dev_put(mid->dma_dev);
> +}
> +
>   static int dnv_handle_irq(struct uart_port *p)
>   {
>   	struct mid8250 *mid = p->private_data;
> @@ -330,9 +340,9 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   
>   	pci_set_drvdata(pdev, mid);
>   	return 0;
> +
>   err:
> -	if (mid->board->exit)
> -		mid->board->exit(mid);
> +	mid->board->exit(mid);
>   	return ret;
>   }
>   
> @@ -342,8 +352,7 @@ static void mid8250_remove(struct pci_dev *pdev)
>   
>   	serial8250_unregister_port(mid->line);
>   
> -	if (mid->board->exit)
> -		mid->board->exit(mid);
> +	mid->board->exit(mid);
>   }
>   
>   static const struct mid8250_board pnw_board = {
> @@ -351,6 +360,7 @@ static const struct mid8250_board pnw_board = {
>   	.freq = 50000000,
>   	.base_baud = 115200,
>   	.setup = pnw_setup,
> +	.exit = pnw_exit,
>   };
>   
>   static const struct mid8250_board tng_board = {
> @@ -358,6 +368,7 @@ static const struct mid8250_board tng_board = {
>   	.freq = 38400000,
>   	.base_baud = 1843200,
>   	.setup = tng_setup,
> +	.exit = tng_exit,
>   };
>   
>   static const struct mid8250_board dnv_board = {


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