linux-kernel - [PATCH] serial: 8250_pci: handle FL

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Message-Id: <20210527095529.26281-1-christian.gmeiner@gmail.com>
Date:   Thu, 27 May 2021 11:54:40 +0200
From:   Christian Gmeiner <christian.gmeiner@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Christian Gmeiner <christian.gmeiner@...il.com>,
        stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Tobias Diedrich <tobiasdiedrich@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Du Huanpeng <u74147@...il.com>,
        Ralf Ramsauer <ralf.ramsauer@...-regensburg.de>,
        linux-serial@...r.kernel.org
Subject: [PATCH] serial: 8250_pci: handle FL_NOIRQ board flag

In commit 8428413b1d14 ("serial: 8250_pci: Implement MSI(-X) support")
the way the irq gets allocated was changed. With that change the
handling FL_NOIRQ got lost. Restore the old behaviour.

Fixes: 8428413b1d14 ("serial: 8250_pci: Implement MSI(-X) support")
Cc: <stable@...r.kernel.org>
Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
---
 drivers/tty/serial/8250/8250_pci.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 689d8227f95f..3b8217844c0b 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -3944,21 +3944,26 @@ pciserial_init_ports(struct pci_dev *dev, const struct pciserial_board *board)
 	uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
 	uart.port.uartclk = board->base_baud * 16;
 
-	if (pci_match_id(pci_use_msi, dev)) {
-		dev_dbg(&dev->dev, "Using MSI(-X) interrupts\n");
-		pci_set_master(dev);
-		rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
+	if (board->flags & FL_NOIRQ) {
+		uart.port.irq = 0;
 	} else {
-		dev_dbg(&dev->dev, "Using legacy interrupts\n");
-		rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY);
-	}
-	if (rc < 0) {
-		kfree(priv);
-		priv = ERR_PTR(rc);
-		goto err_deinit;
+		if (pci_match_id(pci_use_msi, dev)) {
+			dev_dbg(&dev->dev, "Using MSI(-X) interrupts\n");
+			pci_set_master(dev);
+			rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
+		} else {
+			dev_dbg(&dev->dev, "Using legacy interrupts\n");
+			rc = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY);
+		}
+		if (rc < 0) {
+			kfree(priv);
+			priv = ERR_PTR(rc);
+			goto err_deinit;
+		}
+
+		uart.port.irq = pci_irq_vector(dev, 0);
 	}
 
-	uart.port.irq = pci_irq_vector(dev, 0);
 	uart.port.dev = &dev->dev;
 
 	for (i = 0; i < nr_ports; i++) {
-- 
2.31.1