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-rw-r--r--drivers/spi/spi.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ec395a6baf9c..9da0bc5a036c 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2143,8 +2143,17 @@ int spi_register_controller(struct spi_controller *ctlr)
*/
if (ctlr->num_chipselect == 0)
return -EINVAL;
- /* allocate dynamic bus number using Linux idr */
- if ((ctlr->bus_num < 0) && ctlr->dev.of_node) {
+ if (ctlr->bus_num >= 0) {
+ /* devices with a fixed bus num must check-in with the num */
+ mutex_lock(&board_lock);
+ id = idr_alloc(&spi_master_idr, ctlr, ctlr->bus_num,
+ ctlr->bus_num + 1, GFP_KERNEL);
+ mutex_unlock(&board_lock);
+ if (WARN(id < 0, "couldn't get idr"))
+ return id == -ENOSPC ? -EBUSY : id;
+ ctlr->bus_num = id;
+ } else if (ctlr->dev.of_node) {
+ /* allocate dynamic bus number using Linux idr */
id = of_alias_get_id(ctlr->dev.of_node, "spi");
if (id >= 0) {
ctlr->bus_num = id;