x86_issue_ipi: keep interrupt disabled while issuing IPI

2015-09-29 19:02:40 +09:00
parent a666b69c2c
commit 79266f6b97
1 changed files with 4 additions and 0 deletions
--- a/arch/x86/kernel/cpu.c
+++ b/arch/x86/kernel/cpu.c
@ -818,8 +818,12 @@ static void wait_icr_idle(void)

 void x86_issue_ipi(unsigned int apicid, unsigned int low)
 {
+	unsigned long flags;
+
+	flags = cpu_disable_interrupt_save();
 	wait_icr_idle();
 	lapic_icr_write(apicid << LAPIC_ICR_ID_SHIFT, low);
+	cpu_restore_interrupt(flags);
 }

 static void outb(uint8_t v, uint16_t port)