FAILED: patch "[PATCH] serial: 8250_bcm2835aux: Restore clock error handling" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 83e571f054cd742eb9a46d46ef05193904adf53f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024012203-blurt-ravage-cfa3@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

83e571f054cd ("serial: 8250_bcm2835aux: Restore clock error handling")
fcc446c8aa63 ("serial: 8250_bcm2835aux: Add ACPI support")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 83e571f054cd742eb9a46d46ef05193904adf53f Mon Sep 17 00:00:00 2001
From: Stefan Wahren <wahrenst@gmx.net>
Date: Wed, 20 Dec 2023 12:43:34 +0100
Subject: [PATCH] serial: 8250_bcm2835aux: Restore clock error handling

The commit fcc446c8aa63 ("serial: 8250_bcm2835aux: Add ACPI support")
dropped the error handling for clock acquiring. But even an optional
clock needs this.

Fixes: fcc446c8aa63 ("serial: 8250_bcm2835aux: Add ACPI support")
Cc: stable <stable@kernel.org>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20231220114334.4712-1-wahrenst@gmx.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
index b5760f914a8c..beac6b340ace 100644
--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -119,6 +119,8 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 
 	/* get the clock - this also enables the HW */
 	data->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(data->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(data->clk), "could not get clk\n");
 
 	/* get the interrupt */
 	ret = platform_get_irq(pdev, 0);