linux-kernel - [PATCH] misc/ics932s401: Add a missing check to i2c_smbus_read_word

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Date:   Mon, 24 Dec 2018 11:31:13 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] misc/ics932s401: Add a missing check to i2c_smbus_read_word_data

ics932s401_update_device may fail reading in i2c_smbus_read_word_data
due to error in i2c_smbus_xfer. The fix checks the status and defaults
the register to 0.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/misc/ics932s401.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/ics932s401.c b/drivers/misc/ics932s401.c
index 81a0541ef3ac..294fb2f66bfe 100644
--- a/drivers/misc/ics932s401.c
+++ b/drivers/misc/ics932s401.c
@@ -146,6 +146,8 @@ static struct ics932s401_data *ics932s401_update_device(struct device *dev)
 	 */
 	for (i = 0; i < NUM_MIRRORED_REGS; i++) {
 		temp = i2c_smbus_read_word_data(client, regs_to_copy[i]);
+		if (temp < 0)
+			data->regs[regs_to_copy[i]] = 0;
 		data->regs[regs_to_copy[i]] = temp >> 8;
 	}
 
-- 
2.17.1