| Message ID | 1455561281-18573-1-git-send-email-broonie@kernel.org |
|---|---|
| State | Accepted |
| Commit | 628269704f19fcfc765499b7158effccfc79b6cf |
| Headers | show |
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 0ad55946e388..4252a112985c 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1207,6 +1207,9 @@ static void __spi_pump_messages(struct spi_master *master, bool in_kthread) return; } mutex_unlock(&master->bus_lock_mutex); + + /* Prod the scheduler in case transfer_one() was busy waiting */ + cond_resched(); } /**
When a controller has only PIO support it is very likely that we will run into use cases where we spend a very large amount of time consuming CPU. Code that does this should call cond_resched() every once in a while to give other tasks more of a chance to run so do that in the main SPI loop, the overhead is negligable if it's not needed. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mark Brown <broonie@kernel.org> --- drivers/spi/spi.c | 3 +++ 1 file changed, 3 insertions(+) -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html