[Xen-changelog] [xen staging] x86/IRQs: correct/tighten vector check in _clear_irq_vector()

[patchbot@xxxxxxx]

commit c6b0dad9345ee6935170cd39a28f0cfdcd7c5b91
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jul 22 11:45:28 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jul 22 11:45:28 2019 +0200

    x86/IRQs: correct/tighten vector check in _clear_irq_vector()
    
    If any particular value was to be checked against, it would need to be
    IRQ_VECTOR_UNASSIGNED.
    
    Reported-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    
    Be more strict though and use valid_irq_vector() instead.
    
    Take the opportunity and also convert local variables to unsigned int.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/irq.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 732ddd4efd..f5e31a1c9b 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -283,14 +283,13 @@ void destroy_irq(unsigned int irq)
 
 static void _clear_irq_vector(struct irq_desc *desc)
 {
-    unsigned int cpu;
-    int vector, old_vector, irq = desc->irq;
+    unsigned int cpu, old_vector, irq = desc->irq;
+    unsigned int vector = desc->arch.vector;
     cpumask_t tmp_mask;
 
-    BUG_ON(!desc->arch.vector);
+    BUG_ON(!valid_irq_vector(vector));
 
     /* Always clear desc->arch.vector */
-    vector = desc->arch.vector;
     cpumask_and(&tmp_mask, desc->arch.cpu_mask, &cpu_online_map);
 
     for_each_cpu(cpu, &tmp_mask) {
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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