From: Anna Neal Date: Thu, 2 Apr 2009 21:44:09 +0000 (-0700) Subject: libertas: increase spi driver thread priority X-Git-Tag: upstream/snapshot3+hdmi~18292^2~645^2~104 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b26ed97c75e1538176c09f29c423a3f8a75868a7;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git libertas: increase spi driver thread priority Currently, the libertas main thread contends with the spi driver thread in the TX path. To improve throughput, ensure that the driver thread has higher scheduling priority than the libertas main thread. Do this by making the libertas spi driver thread a low priority real time thread. We measured an average throughput improvement of 13%. Signed-off-by: Anna Neal Signed-off-by: Andrey Yurovsky Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/libertas/if_spi.c b/drivers/net/wireless/libertas/if_spi.c index 07311e7..97493e2 100644 --- a/drivers/net/wireless/libertas/if_spi.c +++ b/drivers/net/wireless/libertas/if_spi.c @@ -1020,6 +1020,7 @@ static int __devinit if_spi_probe(struct spi_device *spi) struct libertas_spi_platform_data *pdata = spi->dev.platform_data; int err = 0; u32 scratch; + struct sched_param param = { .sched_priority = 1 }; lbs_deb_enter(LBS_DEB_SPI); @@ -1123,6 +1124,9 @@ static int __devinit if_spi_probe(struct spi_device *spi) lbs_pr_err("error creating SPI thread: err=%d\n", err); goto remove_card; } + if (sched_setscheduler(card->spi_thread, SCHED_FIFO, ¶m)) + lbs_pr_err("Error setting scheduler, using default.\n"); + err = request_irq(spi->irq, if_spi_host_interrupt, IRQF_TRIGGER_FALLING, "libertas_spi", card); if (err) {