From 8ced8eee8537b52ef5d77e28d7676ce81bc62359 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sat, 1 Jul 2006 17:12:53 +0200 Subject: [PATCH] [PATCH] i2c-powermac: Fix master_xfer return value Fix the value returned by the i2c-powermac's master_xfer method. It should return the number of messages processed successfully, but instead returns the number of data bytes in the first (and only) processed message. Also explicitly mention the master_xfer convention so that future implementations get it right directly. Signed-off-by: Jean Delvare Acked-by: Benjamin Herrenschmidt Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-powermac.c | 4 +--- include/linux/i2c.h | 2 ++ 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c index 2a0b3be7cdd0..53bb43593863 100644 --- a/drivers/i2c/busses/i2c-powermac.c +++ b/drivers/i2c/busses/i2c-powermac.c @@ -148,8 +148,6 @@ static int i2c_powermac_master_xfer( struct i2c_adapter *adap, int read; int addrdir; - if (num != 1) - return -EINVAL; if (msgs->flags & I2C_M_TEN) return -EINVAL; read = (msgs->flags & I2C_M_RD) != 0; @@ -166,7 +164,7 @@ static int i2c_powermac_master_xfer( struct i2c_adapter *adap, rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len); bail: pmac_i2c_close(bus); - return rc < 0 ? rc : msgs->len; + return rc < 0 ? rc : 1; } static u32 i2c_powermac_func(struct i2c_adapter * adapter) diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 526ddc8eecfb..eb0628a7ecc6 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -193,6 +193,8 @@ struct i2c_algorithm { to NULL. If an adapter algorithm can do SMBus access, set smbus_xfer. If set to NULL, the SMBus protocol is simulated using common I2C messages */ + /* master_xfer should return the number of messages successfully + processed, or a negative value on error */ int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs, int num); int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, -- 2.20.1