diff options
-rw-r--r-- | exec.c | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -2482,6 +2482,7 @@ typedef struct { void *buffer; hwaddr addr; hwaddr len; + bool in_use; } BounceBuffer; static BounceBuffer bounce; @@ -2570,7 +2571,7 @@ void *address_space_map(AddressSpace *as, l = len; mr = address_space_translate(as, addr, &xlat, &l, is_write); if (!memory_access_is_direct(mr, is_write)) { - if (bounce.buffer) { + if (atomic_xchg(&bounce.in_use, true)) { return NULL; } /* Avoid unbounded allocations */ @@ -2640,6 +2641,7 @@ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len, qemu_vfree(bounce.buffer); bounce.buffer = NULL; memory_region_unref(bounce.mr); + atomic_mb_set(&bounce.in_use, false); cpu_notify_map_clients(); } |