Changeset f619ec11 in mainline for kernel/arch/ia64/src/drivers/it.c

Timestamp:

2007-02-03T21:26:54Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

cf5ddf6

Parents:

80bcaed

Message:

When clock() is called by an external interrupt dispatched by the IRQ dispatcher,
no spinlock can be held or the kernel will not be preemptive. This fixes Ticket #24.

Formating and indentation fixes.

File:

• kernel/arch/ia64/src/drivers/it.c (modified) (1 diff)

kernel/arch/ia64/src/drivers/it.c

@@ -114 +114 @@
         itm_write(m);
         srlz_d();                               /* propagate changes */
-        
+
+        /*
+         * We are holding a lock which prevents preemption.
+         * Release the lock, call clock() and reacquire the lock again.
+         */
+        spinlock_unlock(&irq->lock);    
         clock();
+        spinlock_lock(&irq->lock);
 }