i2c: Bus drivers return -Errno not -1

Tighten error paths used by various i2c adapters (mostly x86) so
they return real fault/errno codes instead of a "-1" (which is
most often interpreted as "-EPERM").  Build tested, with eyeball
review.

One minor initial goal is to have adapters consistently return
the code "-ENXIO" when addressing a device doesn't get an ACK
response, at least in the probe paths where they are already
good at stifling related logspam.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index 35812823787b..eb8f72ca02f4 100644
--- a/drivers/i2c/algos/i2c-algo-bit.c
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -320,7 +320,7 @@ static int try_address(struct i2c_adapter *i2c_adap,
                        unsigned char addr, int retries)
 {
         struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
-        int i, ret = -1;
+        int i, ret = 0;
 
         for (i = 0; i <= retries; i++) {
                 ret = i2c_outb(i2c_adap, addr);
@@ -508,7 +508,7 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
                         addr ^= 1;
                 ret = try_address(i2c_adap, addr, retries);
                 if ((ret != 1) && !nak_ok)
-                        return -EREMOTEIO;
+                        return -ENXIO;
         }
 
         return 0;