Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

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

Browse source 
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>
This commit is contained in:
Jean Delvare 2012-03-26 21:47:19 +02:00 committed by Jean Delvare
parent 5694f8a888
commit 41101a3302
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/i2c/algos/i2c-algo-bit.c
View file

@ -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)