tunnels: do not assume mac header is set in skb_tunnel_check_pmtu()

[mirror_ubuntu-jammy-kernel.git] / mm / cma.c

diff --git a/mm/cma.c b/mm/cma.c
index 995e15480937fee8ceb6e88d0b78b21be8d6a5eb..a972c3440c404b7e28bd978f756ebed0897fd329 100644 (file)
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -37,6 +37,7 @@
 
 struct cma cma_areas[MAX_CMA_AREAS];
 unsigned cma_area_count;
+static DEFINE_MUTEX(cma_mutex);
 
 phys_addr_t cma_get_base(const struct cma *cma)
 {
@@ -471,9 +472,10 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
                spin_unlock_irq(&cma->lock);
 
                pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
+               mutex_lock(&cma_mutex);
                ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
                                     GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0));
-
+               mutex_unlock(&cma_mutex);
                if (ret == 0) {
                        page = pfn_to_page(pfn);
                        break;