Make the driver report an ENXIO error immediately upon NAK instead of
waiting for another interrupt and getting a timeout.
Signed-off-by: Mike Ditto <[EMAIL PROTECTED]>
---
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.
Index: linux/drivers/i2c/busses/i2c-cpm.c
===================================================================
retrieving revision 1.3
diff -u -p -r1.3 i2c-cpm.c
--- linux/drivers/i2c/busses/i2c-cpm.c 31 Oct 2008 06:36:08 -0000 1.3
+++ linux/drivers/i2c/busses/i2c-cpm.c 1 Nov 2008 00:12:45 -0000
@@ -369,6 +369,7 @@ static int cpm_i2c_xfer(struct i2c_adapt
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
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