linux-kernel - Re: [PATCH 1/6] tty: serial: 8250: Fix the amount of ports doesn't match the device

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Message-ID: <4a748c05-c74c-4b4b-bacf-664b774a490e@kernel.org>
Date: Tue, 11 Jun 2024 09:39:34 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Crescent Hsieh <crescentcy.hsieh@...a.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 1/6] tty: serial: 8250: Fix the amount of ports doesn't
 match the device

On 07. 06. 24, 13:43, Crescent Hsieh wrote:
> Normally, the amount of ports is written at the third digit of device ID
> of Moxa PCI boards, for example: `0x1121` indicates a 2 ports device.
> 
> However, `CP116E_A_A` and `CP116E_A_B` are two exceptions, which has 8
> ports but the third digit of device ID is `6`.
> 
> This patch fixes the issue above by adding checks.
> 
> Signed-off-by: Crescent Hsieh <crescentcy.hsieh@...a.com>
> ---
>   drivers/tty/serial/8250/8250_pci.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> index 40af74b55933..4e88ee07e548 100644
> --- a/drivers/tty/serial/8250/8250_pci.c
> +++ b/drivers/tty/serial/8250/8250_pci.c
> @@ -2041,6 +2041,10 @@ static int pci_moxa_init(struct pci_dev *dev)
>   	unsigned int num_ports = (device & 0x00F0) >> 4, i;
>   	u8 val, init_mode = MOXA_RS232;
>   
> +	if (device == PCI_DEVICE_ID_MOXA_CP116E_A_A ||
> +	    device == PCI_DEVICE_ID_MOXA_CP116E_A_B)
> +		num_ports = 8;

Can you perhaps introduce a helper like:
static unsigned short mxser_get_nports(struct pci_dev *pdev)
{
   switch (pdev->device) {
   case ...CP116E_A_A:
   case ...CP116E_A_B:
     return 8;
   }

   return FIELD_GET(0x00F0, pdev->device);
}

?

> +
>   	if (!(pci_moxa_supported_rs(dev) & MOXA_SUPP_RS232)) {
>   		init_mode = MOXA_RS422;
>   	}

-- 
js
suse labs