[PATCH] hpet: remove superfluous register reads (3f992e1b) · Commits · 戴 / test

This patch removes several reads of a timer's config register that serve no purpose whatsoever. Signed-off-by:

drivers/char/hpet.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -367,7 +367,6 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
		if (!devp->hd_ireqfreq)
		return -EIO;

		v = readq(&timer->hpet_config);
		spin_lock_irq(&hpet_lock);

		if (devp->hd_flags & HPET_IE) {
		@@ -378,7 +377,6 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
		devp->hd_flags \|= HPET_IE;
		spin_unlock_irq(&hpet_lock);

		t = readq(&timer->hpet_config);
		irq = devp->hd_hdwirq;

		if (irq) {
		@@ -855,11 +853,9 @@ int hpet_alloc(struct hpet_data *hdp)
		}

		for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
		unsigned long v;
		struct hpet_timer __iomem *timer;

		timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
		v = readq(&timer->hpet_config);

		devp->hd_hpets = hpetp;
		devp->hd_hpet = hpet;