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-rw-r--r--drivers/spi/spi.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 1168ef015887..7a3f733051e9 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -395,7 +395,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master);
395int __init_or_module 395int __init_or_module
396spi_register_master(struct spi_master *master) 396spi_register_master(struct spi_master *master)
397{ 397{
398 static atomic_t dyn_bus_id = ATOMIC_INIT(0); 398 static atomic_t dyn_bus_id = ATOMIC_INIT((1<<16) - 1);
399 struct device *dev = master->cdev.dev; 399 struct device *dev = master->cdev.dev;
400 int status = -ENODEV; 400 int status = -ENODEV;
401 int dynamic = 0; 401 int dynamic = 0;
@@ -404,7 +404,7 @@ spi_register_master(struct spi_master *master)
404 return -ENODEV; 404 return -ENODEV;
405 405
406 /* convention: dynamically assigned bus IDs count down from the max */ 406 /* convention: dynamically assigned bus IDs count down from the max */
407 if (master->bus_num == 0) { 407 if (master->bus_num < 0) {
408 master->bus_num = atomic_dec_return(&dyn_bus_id); 408 master->bus_num = atomic_dec_return(&dyn_bus_id);
409 dynamic = 1; 409 dynamic = 1;
410 } 410 }