linux-kernel - [PATCH v3] i2c: bpmp-tegra: Ignore unknown I2C

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Message-Id: <20210112102225.3737326-1-mperttunen@nvidia.com>
Date:   Tue, 12 Jan 2021 12:22:25 +0200
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     thierry.reding@...il.com, jonathanh@...dia.com
Cc:     talho@...dia.com, linux-i2c@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>, stable@...r.kernel.org
Subject: [PATCH v3] i2c: bpmp-tegra: Ignore unknown I2C_M flags

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.

Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
v3:
- Ignore all unknown flags instead of just I2C_M_DMA_SAFE
---
 drivers/i2c/busses/i2c-tegra-bpmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-tegra-bpmp.c b/drivers/i2c/busses/i2c-tegra-bpmp.c
index ec7a7e917edd..c0c7d01473f2 100644
--- 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 flags, u16 *out)
 		flags &= ~I2C_M_RECV_LEN;
 	}
 
-	return (flags != 0) ? -EINVAL : 0;
+	return 0;
 }
 
 /**
-- 
2.30.0