Re: report bug: System reboots when accessing a loop-device over a second loop-device with 2.4.2-ac7

[Jens Axboe <axboe@suse.de>]

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On Fri, Mar 02 2001, Mario Hermann wrote:
> There is another small bug with the loop over loop problem. Now it works
> fine for
> files but not for Devices:
> 
> losetup /dev/loop0 /dev/sr1
> losetup /dev/loop1 /dev/loop0
> dd if=/dev/loop1 of=test.dat bs=2048 count=1024

Pending miscount, this should fix it.

-- 
Jens Axboe


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--- /opt/kernel/linux-2.4.2-ac8/drivers/block/loop.c	Fri Mar  2 14:48:24 2001
+++ drivers/block/loop.c	Fri Mar  2 16:27:31 2001
@@ -307,6 +307,7 @@
 		lo->lo_bh = lo->lo_bhtail = bh;
 	spin_unlock_irqrestore(&lo->lo_lock, flags);
 
+	atomic_inc(&lo->lo_pending);
 	up(&lo->lo_bh_mutex);
 }
 
@@ -404,7 +405,6 @@
 	spin_lock_irq(&lo->lo_lock);
 	if (lo->lo_state != Lo_bound)
 		goto inactive;
-	atomic_inc(&lo->lo_pending);
 	spin_unlock_irq(&lo->lo_lock);
 
 	if (rw == WRITE) {
@@ -452,8 +452,6 @@
 	return 0;
 
 err:
-	if (atomic_dec_and_test(&lo->lo_pending))
-		up(&lo->lo_bh_mutex);
 	loop_put_buffer(bh);
 out:
 	buffer_IO_error(rbh);