Grab Giant around calls to contigmalloc() and contigfree() so

that drivers converted to be MP safe don't have to deal with it.

1 files changed, 8 insertions, 1 deletions

diff --git a/sys/alpha/alpha/busdma_machdep.c b/sys/alpha/alpha/busdma_machdep.c
index c48016b..bd127a1 100644
--- a/sys/alpha/alpha/busdma_machdep.c
+++ b/sys/alpha/alpha/busdma_machdep.c
@@ -367,10 +367,12 @@ bus_dmamem_alloc_size(bus_dma_tag_t dmat, void** vaddr, int flags,
 		 *     and handles multi-seg allocations.  Nobody is doing
 		 *     multi-seg allocations yet though.
 		 */
+		mtx_lock(&Giant);
 		*vaddr = contigmalloc(size, M_DEVBUF,
 		    (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK,
 		    0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul,
 		    dmat->boundary);
+		mtx_unlock(&Giant);
 	}
 	if (*vaddr == NULL)
 		return (ENOMEM);
@@ -400,8 +402,11 @@ bus_dmamem_free_size(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map,
 		panic("bus_dmamem_free: Invalid map freed\n");
 	if ((size <= PAGE_SIZE) && dmat->lowaddr >= ptoa(Maxmem))
 		free(vaddr, M_DEVBUF);
-	else
+	else {
+		mtx_lock(&Giant);
 		contigfree(vaddr, size, M_DEVBUF);
+		mtx_unlock(&Giant);
+	}
 }
 
 void
@@ -842,11 +847,13 @@ alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
 
 		if (bpage == NULL)
 			break;
+		mtx_lock(&Giant);
 		bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
 							 M_NOWAIT, 0ul,
 							 dmat->lowaddr,
 							 PAGE_SIZE,
 							 dmat->boundary);
+		mtx_unlock(&Giant);
 		if (bpage->vaddr == NULL) {
 			free(bpage, M_DEVBUF);
 			break;