This is a note to let you know that I've just added the patch titled
fsl_lpuart: Don't enable interrupts too early
to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 401fb66a355eb0f22096cf26864324f8e63c7d78 Mon Sep 17 00:00:00 2001
From: Indan Zupancic <Indan.Zupancic@xxxxxxxxxxxx>
Date: Thu, 5 May 2022 13:47:50 +0200
Subject: fsl_lpuart: Don't enable interrupts too early
If an irq is pending when devm_request_irq() is called, the irq
handler will cause a NULL pointer access because initialisation
is not done yet.
Fixes: 9d7ee0e28da59 ("tty: serial: lpuart: avoid report NULL interrupt")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Indan Zupancic <Indan.Zupancic@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220505114750.45423-1-Indan.Zupancic@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 87789872f400..be12fee94db5 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2664,6 +2664,7 @@ static int lpuart_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct lpuart_port *sport;
struct resource *res;
+ irq_handler_t handler;
int ret;
sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
@@ -2741,17 +2742,11 @@ static int lpuart_probe(struct platform_device *pdev)
if (lpuart_is_32(sport)) {
lpuart_reg.cons = LPUART32_CONSOLE;
- ret = devm_request_irq(&pdev->dev, sport->port.irq, lpuart32_int, 0,
- DRIVER_NAME, sport);
+ handler = lpuart32_int;
} else {
lpuart_reg.cons = LPUART_CONSOLE;
- ret = devm_request_irq(&pdev->dev, sport->port.irq, lpuart_int, 0,
- DRIVER_NAME, sport);
+ handler = lpuart_int;
}
-
- if (ret)
- goto failed_irq_request;
-
ret = uart_add_one_port(&lpuart_reg, &sport->port);
if (ret)
goto failed_attach_port;
@@ -2773,13 +2768,18 @@ static int lpuart_probe(struct platform_device *pdev)
sport->port.rs485_config(&sport->port, &sport->port.rs485);
+ ret = devm_request_irq(&pdev->dev, sport->port.irq, handler, 0,
+ DRIVER_NAME, sport);
+ if (ret)
+ goto failed_irq_request;
+
return 0;
+failed_irq_request:
failed_get_rs485:
failed_reset:
uart_remove_one_port(&lpuart_reg, &sport->port);
failed_attach_port:
-failed_irq_request:
lpuart_disable_clks(sport);
failed_clock_enable:
failed_out_of_range:
--
2.36.0
