Commit 41101a33 authored Mar 26, 2012 by Jean Delvare Committed by Jean Delvare Mar 26, 2012

i2c-algo-bit: Don't resched on clock stretching



Clock stretching is not supposed to last long, so asking to be
rescheduled while waiting for the clock line to be released by a slave
makes little sense. Odds are that the clock line will long have been
released when we run again, so we will have lost time and may even
get an SMBus timeout because of this.

So just busy-wait in that case. This also participates in the effort
to make i2c-algo-bit usable in contexts that can't sleep.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Ben Skeggs <bskeggs@redhat.com>

parent 5694f8a8

drivers/i2c/algos/i2c-algo-bit.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -112,7 +112,7 @@ static int sclhi(struct i2c_algo_bit_data *adap)
		break;
		return -ETIMEDOUT;
		}
		cond_resched();
		cpu_relax();
		}
		#ifdef DEBUG
		if (jiffies != start && i2c_debug >= 3)