Messages in this thread Patch in this message | | | Date | Thu, 15 May 2003 04:31:00 +0100 | From | davej@codemonk ... | Subject | i8253 locking. |
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There are still a few places where we play with the RTC directly, with no locking. This catches some of them.
--- bk-linus/arch/i386/kernel/apm.c 2003-05-11 22:59:28.000000000 +0100 +++ linux-2.5/arch/i386/kernel/apm.c 2003-05-15 03:10:19.000000000 +0100 @@ -1166,9 +1166,13 @@ static void get_time_diff(void) #endif } -static inline void reinit_timer(void) +static void reinit_timer(void) { #ifdef INIT_TIMER_AFTER_SUSPEND + unsigned long flags; + extern spinlock_t i8253_lock; + + spin_lock_irqsave(&i8253_lock, flags); /* set the clock to 100 Hz */ outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ udelay(10); @@ -1176,6 +1180,7 @@ static inline void reinit_timer(void) udelay(10); outb(LATCH >> 8, PIT_CH0); /* MSB */ udelay(10); + spin_unlock_irqrestore(&i8253_lock, flags); #endif } diff -urpN --exclude-from=/home/davej/.exclude bk-linus/arch/i386/kernel/i8259.c linux-2.5/arch/i386/kernel/i8259.c --- bk-linus/arch/i386/kernel/i8259.c 2003-04-22 00:40:42.000000000 +0100 +++ linux-2.5/arch/i386/kernel/i8259.c 2003-04-22 01:23:12.000000000 +0100 @@ -373,11 +373,16 @@ void __init init_ISA_irqs (void) static void setup_timer(void) { + extern spinlock_t i8253_lock; + unsigned long flags; + + spin_lock_irqsave(&i8253_lock, flags); outb_p(0x34,PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ udelay(10); outb_p(LATCH & 0xff , PIT_CH0); /* LSB */ udelay(10); outb(LATCH >> 8 , PIT_CH0); /* MSB */ + spin_unlock_irqrestore(&i8253_lock, flags); } static int timer_resume(struct device *dev, u32 level) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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