diff options
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 0f6cd44fff29..6e55a1a2613d 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -2262,12 +2262,25 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size) struct resource *iter; mutex_lock(&hyperv_mmio_lock); + + /* + * If all bytes of the MMIO range to be released are within the + * special case fb_mmio shadow region, skip releasing the shadow + * region since no corresponding __request_region() was done + * in vmbus_allocate_mmio(). + */ + if (fb_mmio && start >= fb_mmio->start && + (start + size - 1 <= fb_mmio->end)) + goto skip_shadow_release; + for (iter = hyperv_mmio; iter; iter = iter->sibling) { if ((iter->start >= start + size) || (iter->end <= start)) continue; __release_region(iter, start, size); } + +skip_shadow_release: release_mem_region(start, size); mutex_unlock(&hyperv_mmio_lock); |