From 7053fdac76451efe5f16c9e0974dc17fcf29f6d6 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Sun, 8 Nov 2015 18:07:38 +0100 Subject: [PATCH] clocksource/drivers/h8300_timer8: Remove pointless irq re-entrant safe code The current code assumes the interrupt function is re-entrant. That is not correct. An interrupt handler is never invoked concurrently. The interrupt line is masked on all processors. Remove the chewing flags in the code. Signed-off-by: Daniel Lezcano --- drivers/clocksource/h8300_timer8.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c index 3eedeffccc26..7111b99be6d5 100644 --- a/drivers/clocksource/h8300_timer8.c +++ b/drivers/clocksource/h8300_timer8.c @@ -24,8 +24,6 @@ #define TCORB 6 #define _8TCNT 8 -#define FLAG_SKIPEVENT (1 << 1) -#define FLAG_IRQCONTEXT (1 << 2) #define FLAG_STARTED (1 << 3) #define SCALE 64 @@ -67,14 +65,13 @@ static irqreturn_t timer8_interrupt(int irq, void *dev_id) ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~0x40, p->mapbase + _8TCSR); - p->flags |= FLAG_IRQCONTEXT; + ctrl_outw(p->tcora, p->mapbase + TCORA); - if (!(p->flags & FLAG_SKIPEVENT)) { - if (clockevent_state_oneshot(&p->ced)) - ctrl_outw(0x0000, p->mapbase + _8TCR); - p->ced.event_handler(&p->ced); - } - p->flags &= ~(FLAG_SKIPEVENT | FLAG_IRQCONTEXT); + + if (clockevent_state_oneshot(&p->ced)) + ctrl_outw(0x0000, p->mapbase + _8TCR); + + p->ced.event_handler(&p->ced); return IRQ_HANDLED; } -- 2.20.1