queue-6.12/ipmi-ipmb-initialise-event-handler-read-bytes.patch

From 8d81fe3818a1e1b4c97628a09627415e1567ecdd Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Tue, 13 Jan 2026 17:41:34 +0800
Subject: ipmi: ipmb: initialise event handler read bytes

From: Matt Johnston <matt@codeconstruct.com.au>

[ Upstream commit 9f235ccecd03c436cb1683eac16b12f119e54aa9 ]

IPMB doesn't use i2c reads, but the handler needs to set a value.
Otherwise an i2c read will return an uninitialised value from the bus
driver.

Fixes: 63c4eb347164 ("ipmi:ipmb: Add initial support for IPMI over IPMB")
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Message-ID: <20260113-ipmb-read-init-v1-1-a9cbce7b94e3@codeconstruct.com.au>
Signed-off-by: Corey Minyard <corey@minyard.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/char/ipmi/ipmi_ipmb.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_ipmb.c b/drivers/char/ipmi/ipmi_ipmb.c
index 6a4f279c7c1f5..163ec867d68af 100644
--- a/drivers/char/ipmi/ipmi_ipmb.c
+++ b/drivers/char/ipmi/ipmi_ipmb.c
@@ -202,11 +202,16 @@ static int ipmi_ipmb_slave_cb(struct i2c_client *client,
 		break;
 
 	case I2C_SLAVE_READ_REQUESTED:
+		*val = 0xff;
+		ipmi_ipmb_check_msg_done(iidev);
+		break;
+
 	case I2C_SLAVE_STOP:
 		ipmi_ipmb_check_msg_done(iidev);
 		break;
 
 	case I2C_SLAVE_READ_PROCESSED:
+		*val = 0xff;
 		break;
 	}
 
-- 
2.51.0