[Xen-devel] [PATCH] x86/HPET: fix oversight in 23033:84bacd800bf8

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

Clearly for the adjusted BUG_ON()s to not yield false positives
num_chs_used must be incremented before setting up an IRQ (and
decremented back when the setup failed).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/xen/arch/x86/hpet.c
+++ b/xen/arch/x86/hpet.c
@@ -428,10 +428,8 @@ static unsigned int __init hpet_fsb_cap_
         ch->flags = 0;
         ch->idx = i;
 
-        if ( (ch->irq = hpet_assign_irq(num_chs_used)) < 0 )
-            continue;
-
-        num_chs_used++;
+        if ( (ch->irq = hpet_assign_irq(num_chs_used++)) < 0 )
+            num_chs_used--;
     }
 
     printk(XENLOG_INFO "HPET: %u timers (%u will be used for broadcast)\n",

Attachment: x86-hpet-fix-23033.patch
Description: Text document

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