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

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Date: Fri,  7 Jun 2024 19:43:31 +0800
From: Crescent Hsieh <crescentcy.hsieh@...a.com>
To: Jiri Slaby <jirislaby@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Crescent Hsieh <crescentcy.hsieh@...a.com>
Subject: [PATCH 1/6] tty: serial: 8250: Fix the amount of ports doesn't match the device

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;
+
 	if (!(pci_moxa_supported_rs(dev) & MOXA_SUPP_RS232)) {
 		init_mode = MOXA_RS422;
 	}
-- 
2.34.1