svn commit: r367984 - head/sys/arm64/arm64

[Emmanuel Vadot]

Author: manu
Date: Tue Nov 24 14:05:35 2020
New Revision: 367984
URL: https://svnweb.freebsd.org/changeset/base/367984

Log:
  arm64: Check if we have a map before checking the flags
  
  This fixes amdgpu on arm64 where linuxkpi is calling id_mapped
  and we call might_bounce without a map.

Modified:
  head/sys/arm64/arm64/busdma_bounce.c

Modified: head/sys/arm64/arm64/busdma_bounce.c
==============================================================================
--- head/sys/arm64/arm64/busdma_bounce.c	Tue Nov 24 13:19:31 2020	(r367983)
+++ head/sys/arm64/arm64/busdma_bounce.c	Tue Nov 24 14:05:35 2020	(r367984)
@@ -207,7 +207,7 @@ might_bounce(bus_dma_tag_t dmat, bus_dmamap_t map, bus
 {
 
 	/* Memory allocated by bounce_bus_dmamem_alloc won't bounce */
-	if ((map->flags & DMAMAP_FROM_DMAMEM) != 0)
+	if (map && (map->flags & DMAMAP_FROM_DMAMEM) != 0)
 		return (false);
 
 	if ((dmat->bounce_flags & BF_COULD_BOUNCE) != 0)