i2c-cpm: Detect and report NAK right away instead of timing out

Make the driver report an ENXIO error immediately upon NAK instead of
waiting for another interrupt and getting a timeout.

When reading from a device that is not present or declines to respond
to, e.g., a non-existent register address, CPM immediately reports a
NAK condition in the TxBD, but the driver kept waiting until a timeout,
which takes 1 second and causes an ugly console error message.

Signed-off-by: Mike Ditto <mditto@consentry.com>
Acked-by: Jochen Friedrich <jochen@scram.de>
[ben-linux@fluff.org: reordered description text]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index 228f75723063..3fcf78e906db 100644
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -365,6 +365,7 @@ static int cpm_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
                 pmsg = &msgs[tptr];
                 if (pmsg->flags & I2C_M_RD)
                         ret = wait_event_interruptible_timeout(cpm->i2c_wait,
+                                (in_be16(&tbdf[tptr].cbd_sc) & BD_SC_NAK) ||
                                 !(in_be16(&rbdf[rptr].cbd_sc) & BD_SC_EMPTY),
                                 1 * HZ);
                 else