i2c/scx200_acb: Provide more information on bus errors

Upon a bus error, it's rather hard to guess what happened. Dumping the
address, length and status provides a lot of value for troubleshooting
issues.

Signed-off-by: Willy Tarreau <wtarreau@exceliance.fr>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
index 648ecc6f60e6..cf994bd01d9c 100644
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -217,8 +217,10 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
         return;
 
  error:
-        dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg,
-                scx200_acb_state_name[iface->state]);
+        dev_err(&iface->adapter.dev,
+                "%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg,
+                scx200_acb_state_name[iface->state], iface->address_byte,
+                iface->len, status);
 
         iface->state = state_idle;
         iface->result = -EIO;