iova: Remove some magazine pointer NULL checks

Since commit 32e92d9 ("iommu/iova: Separate out rcache init") it
has not been possible to have NULL CPU rcache "loaded" or "prev" magazine
pointers once the IOVA domain has been properly initialized. Previously it
was only possible to have NULL pointers from failure to allocate the
magazines in the IOVA domain initialization. The only other two functions
to modify these pointers - __iova_rcache_{get, insert}() - would already
ensure that these pointers were non-NULL if initially non-NULL.

As such, the mag NULL pointer checks in iova_magazine_full(),
iova_magazine_empty(), and iova_magazine_free_pfns() may be dropped.

Signed-off-by: John Garry <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
Reviewed-by: Jerry Snitselaar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: John Garry

drivers/iommu/iova.c

@@ -661,9 +661,6 @@ iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
 	unsigned long flags;
 	int i;
 
-	if (!mag)
-		return;
-
 	spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
 
 	for (i = 0 ; i < mag->size; ++i) {
@@ -683,12 +680,12 @@ iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
 
 static bool iova_magazine_full(struct iova_magazine *mag)
 {
-	return (mag && mag->size == IOVA_MAG_SIZE);
+	return mag->size == IOVA_MAG_SIZE;
 }
 
 static bool iova_magazine_empty(struct iova_magazine *mag)
 {
-	return (!mag || mag->size == 0);
+	return mag->size == 0;
 }
 
 static unsigned long iova_magazine_pop(struct iova_magazine *mag,