Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

[Ard -kwaak- van Breemen <ard@telegraafnet.nl>]

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On Fri, Dec 22, 2006 at 03:41:34PM +0100, Ard -kwaak- van Breemen wrote:
> Repeating: I am very stupid, so I don't know if saving the irq state is ok or
> not in down_read.
The Andrew Morton patch but the rewritten for down_read makes the
symptoms go away.

The problem obviously is that the ide_setup pokes the pci
subsystem way too early.
Parsing of the ide parameters should be delayed until the next
run of parse_args I guess.

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--- linux-2.6.19.1/lib/rwsem-spinlock.c	2006-12-11 19:32:53.000000000 +0000
+++ linux-2.6.19/lib/rwsem-spinlock.c	2006-12-22 15:06:52.000000000 +0000
@@ -129,13 +129,14 @@
 {
 	struct rwsem_waiter waiter;
 	struct task_struct *tsk;
+	unsigned long flags;
 
-	spin_lock_irq(&sem->wait_lock);
+	spin_lock_irqsave(&sem->wait_lock, flags); 
 
 	if (sem->activity >= 0 && list_empty(&sem->wait_list)) {
 		/* granted */
 		sem->activity++;
-		spin_unlock_irq(&sem->wait_lock);
+		spin_unlock_irqrestore(&sem->wait_lock, flags); 
 		goto out;
 	}
 
@@ -150,7 +151,7 @@
 	list_add_tail(&waiter.list, &sem->wait_list);
 
 	/* we don't need to touch the semaphore struct anymore */
-	spin_unlock_irq(&sem->wait_lock);
+	spin_unlock_irqrestore(&sem->wait_lock, flags); 
 
 	/* wait to be given the lock */
 	for (;;) {