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Commit 7671988b authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Linus Torvalds
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i386: PIT stop only, when in periodic or oneshot mode 



The patch is necessary on one of my boxen, where programming the stop
sequence twice leads to PIT malfunction.

Sigh !

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 82644459

arch/i386/kernel/i8253.c

+6 −3
Original line number Diff line number Diff line
@@ -47,9 +47,12 @@ static void init_pit_timer(enum clock_event_mode mode, 


	case CLOCK_EVT_MODE_SHUTDOWN:

	case CLOCK_EVT_MODE_UNUSED:

		if (evt->mode == CLOCK_EVT_MODE_PERIODIC ||

		    evt->mode == CLOCK_EVT_MODE_ONESHOT) {

			outb_p(0x30, PIT_MODE);

		outb_p(0, PIT_CH0);	/* LSB */

		outb_p(0, PIT_CH0);	/* MSB */

			outb_p(0, PIT_CH0);

			outb_p(0, PIT_CH0);

		}

		break;



	case CLOCK_EVT_MODE_ONESHOT: