linux-kernel - [PATCH] media: cx231xx: replace BUG

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Date:   Sun, 15 Dec 2019 13:08:04 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Richard Fontana <rfontana@...hat.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: cx231xx: replace BUG_ON with recovery code

In cx231xx_i2c_register, if dev->cx231xx_send_usb_command is NULL,
the code crashes. However, the callers in cx231xx-core are able to
handle the error without crashing. This patch fixes this issue.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/media/usb/cx231xx/cx231xx-i2c.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c
index f33b6a077d57..c6659253c6fb 100644
--- a/drivers/media/usb/cx231xx/cx231xx-i2c.c
+++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c
@@ -515,7 +515,8 @@ int cx231xx_i2c_register(struct cx231xx_i2c *bus)
 {
 	struct cx231xx *dev = bus->dev;
 
-	BUG_ON(!dev->cx231xx_send_usb_command);
+	if (!dev->cx231xx_send_usb_command)
+		return -EINVAL;
 
 	bus->i2c_adap = cx231xx_adap_template;
 	bus->i2c_adap.dev.parent = dev->dev;
-- 
2.20.1