linux-kernel - [PATCH] serial: 8250: 8250_core: Fix irq name for 8250 serial irq

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Date:   Thu, 16 Mar 2017 17:56:53 +0530
From:   Vignesh R <vigneshr@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Jiri Slaby <jslaby@...e.com>, <linux-serial@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Vignesh R <vigneshr@...com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH] serial: 8250: 8250_core: Fix irq name for 8250 serial irq

Using dev_name() as irq name during request_irq() might be misleading in
case of serial over PCI. Therefore use a better alternative name for
identifying serial port irqs as "serial" appended with serial_index of
the port. This ensures that "serial" string is always present in irq
name while port index will help in distinguishing b/w different ports.

Signed-off-by: Vignesh R <vigneshr@...com>
---

Based on top of tty-next.

 drivers/tty/serial/8250/8250_core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index f83b69f30987..78bf621d6827 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -213,12 +213,20 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
 
 		ret = 0;
 	} else {
+		char *irqname = kmalloc(20, GFP_KERNEL);
+		if (!irqname) {
+			spin_unlock_irq(&i->lock);
+			return -ENOMEM;
+		}
+		snprintf(irqname, 20,
+			 "serial%d", serial_index(&up->port));
+
 		INIT_LIST_HEAD(&up->list);
 		i->head = &up->list;
 		spin_unlock_irq(&i->lock);
 		irq_flags |= up->port.irqflags;
 		ret = request_irq(up->port.irq, serial8250_interrupt,
-				  irq_flags, dev_name(up->port.dev), i);
+				  irq_flags, irqname, i);
 		if (ret < 0)
 			serial_do_unlink(i, up);
 	}
-- 
2.11.0