iova: Remove iovad->rcaches check in iova_rcache_get()

The iovad->rcaches check in iova_rcache_get() is pretty much useless
without the same check in iova_rcache_insert().

Instead of adding this symmetric check to fastpath iova_rcache_insert(),
drop the check in iova_rcache_get() in favour of making the IOVA domain
rcache init more robust to failure in future.

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

Author: John Garry

drivers/iommu/iova.c

@@ -875,7 +875,7 @@ static unsigned long iova_rcache_get(struct iova_domain *iovad,
 {
 	unsigned int log_size = order_base_2(size);
 
-	if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE || !iovad->rcaches)
+	if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE)
 		return 0;
 
 	return __iova_rcache_get(&iovad->rcaches[log_size], limit_pfn - size);