interrupts could be recursive since lapic_eoi() called before rti

so fast interrupts overflow the kernel stack
fix: cli() before lapic_eoi()

1 files changed, 2 insertions, 2 deletions

diff --git a/ide.c b/ide.c
index 67fb613..3532121 100644
--- a/ide.c
+++ b/ide.c
@@ -26,7 +26,7 @@ struct ide_request {
 };
 struct ide_request request[NREQUEST];
 int head, tail;
-struct spinlock ide_lock = { "ide" };
+struct spinlock ide_lock;
 
 int disk_channel;
 
@@ -46,6 +46,7 @@ ide_wait_ready(int check_error)
 void
 ide_init(void)
 {
+  initlock(&ide_lock, "ide");
   if (ncpu < 2) {
     panic ("ide_init: disk interrupt is going to the second  cpu\n");
   }
@@ -61,7 +62,6 @@ ide_intr(void)
   //  cprintf("cpu%d: ide_intr\n", cpu());
   wakeup(&request[tail]);
   release(&ide_lock);
-  lapic_eoi();
 }
 
 int