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| author | Matt Johnston <matt@codeconstruct.com.au> | 2026-01-13 12:01:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-02-27 01:59:16 +0300 |
| commit | 6ff2ebfef75fbc57d937d8fbe738b967edf2d331 (patch) | |
| tree | f322473c7ba3767a780e923a39381d688ce9bccd /drivers/net/mctp | |
| parent | c1116859a7f462233b500bb95e0c85fd6210b08a (diff) | |
| download | linux-6ff2ebfef75fbc57d937d8fbe738b967edf2d331.tar.xz | |
mctp i2c: initialise event handler read bytes
[ Upstream commit 2a14e91b6d76639dac70ea170f4384c1ee3cb48d ]
Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads
will return "val" from the i2c bus driver. For i2c-aspeed and
i2c-npcm7xx that is a stack uninitialised u8.
Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c
instance, now it returns all 0xff.
Fixes: f5b8abf9fc3d ("mctp i2c: MCTP I2C binding driver")
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Link: https://patch.msgid.link/20260113-mctp-read-fix-v1-1-70c4b59c741c@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net/mctp')
| -rw-r--r-- | drivers/net/mctp/mctp-i2c.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c index ecda1cc36391..8043b57bdf25 100644 --- a/drivers/net/mctp/mctp-i2c.c +++ b/drivers/net/mctp/mctp-i2c.c @@ -243,7 +243,10 @@ static int mctp_i2c_slave_cb(struct i2c_client *client, switch (event) { case I2C_SLAVE_READ_REQUESTED: + case I2C_SLAVE_READ_PROCESSED: + /* MCTP I2C transport only uses writes */ midev->rx_pos = 0; + *val = 0xff; break; case I2C_SLAVE_WRITE_RECEIVED: if (midev->rx_pos < MCTP_I2C_BUFSZ) { |