linux-kernel - [PATCH 5.4 01/86] i2c: bpmp-tegra: Ignore unknown I2C

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Message-Id: <20210125183201.091280052@linuxfoundation.org>
Date:   Mon, 25 Jan 2021 19:38:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mikko Perttunen <mperttunen@...dia.com>,
        Wolfram Sang <wsa@...nel.org>
Subject: [PATCH 5.4 01/86] i2c: bpmp-tegra: Ignore unknown I2C_M flags

From: Mikko Perttunen <mperttunen@...dia.com>

commit bc1c2048abbe3c3074b4de91d213595c57741a6b upstream.

In order to not to start returning errors when new I2C_M flags are
added, change behavior to just ignore all flags that we don't know
about. This includes the I2C_M_DMA_SAFE flag that already exists but
causes -EINVAL to be returned for valid transactions.

Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-tegra-bpmp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-tegra-bpmp.c
+++ b/drivers/i2c/busses/i2c-tegra-bpmp.c
@@ -80,7 +80,7 @@ static int tegra_bpmp_xlate_flags(u16 fl
 		flags &= ~I2C_M_RECV_LEN;
 	}
 
-	return (flags != 0) ? -EINVAL : 0;
+	return 0;
 }
 
 /**