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-rw-r--r--drivers/hv/vmbus_drv.c80
1 files changed, 35 insertions, 45 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index eaa5c3b7fd8a..a29a6c0abc01 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1162,64 +1162,54 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
bool fb_overlap_ok)
{
struct resource *iter, *shadow;
- resource_size_t range_min, range_max, start, local_min, local_max;
+ resource_size_t range_min, range_max, start;
const char *dev_n = dev_name(&device_obj->device);
- u32 fb_end = screen_info.lfb_base + (screen_info.lfb_size << 1);
- int i, retval;
+ int retval;
retval = -ENXIO;
down(&hyperv_mmio_lock);
+ /*
+ * If overlaps with frame buffers are allowed, then first attempt to
+ * make the allocation from within the reserved region. Because it
+ * is already reserved, no shadow allocation is necessary.
+ */
+ if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) &&
+ !(max < fb_mmio->start)) {
+
+ range_min = fb_mmio->start;
+ range_max = fb_mmio->end;
+ start = (range_min + align - 1) & ~(align - 1);
+ for (; start + size - 1 <= range_max; start += align) {
+ *new = request_mem_region_exclusive(start, size, dev_n);
+ if (*new) {
+ retval = 0;
+ goto exit;
+ }
+ }
+ }
+
for (iter = hyperv_mmio; iter; iter = iter->sibling) {
if ((iter->start >= max) || (iter->end <= min))
continue;
range_min = iter->start;
range_max = iter->end;
-
- /* If this range overlaps the frame buffer, split it into
- two tries. */
- for (i = 0; i < 2; i++) {
- local_min = range_min;
- local_max = range_max;
- if (fb_overlap_ok || (range_min >= fb_end) ||
- (range_max <= screen_info.lfb_base)) {
- i++;
- } else {
- if ((range_min <= screen_info.lfb_base) &&
- (range_max >= screen_info.lfb_base)) {
- /*
- * The frame buffer is in this window,
- * so trim this into the part that
- * preceeds the frame buffer.
- */
- local_max = screen_info.lfb_base - 1;
- range_min = fb_end;
- } else {
- range_min = fb_end;
- continue;
- }
+ start = (range_min + align - 1) & ~(align - 1);
+ for (; start + size - 1 <= range_max; start += align) {
+ shadow = __request_region(iter, start, size, NULL,
+ IORESOURCE_BUSY);
+ if (!shadow)
+ continue;
+
+ *new = request_mem_region_exclusive(start, size, dev_n);
+ if (*new) {
+ shadow->name = (char *)*new;
+ retval = 0;
+ goto exit;
}
- start = (local_min + align - 1) & ~(align - 1);
- for (; start + size - 1 <= local_max; start += align) {
- shadow = __request_region(iter, start,
- size,
- NULL,
- IORESOURCE_BUSY);
- if (!shadow)
- continue;
-
- *new = request_mem_region_exclusive(start, size,
- dev_n);
- if (*new) {
- shadow->name = (char *)*new;
- retval = 0;
- goto exit;
- }
-
- __release_region(iter, start, size);
- }
+ __release_region(iter, start, size);
}
}