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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 1168ef01588..7a3f733051e 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -395,7 +395,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master);
int __init_or_module
spi_register_master(struct spi_master *master)
{
- static atomic_t dyn_bus_id = ATOMIC_INIT(0);
+ static atomic_t dyn_bus_id = ATOMIC_INIT((1<<16) - 1);
struct device *dev = master->cdev.dev;
int status = -ENODEV;
int dynamic = 0;
@@ -404,7 +404,7 @@ spi_register_master(struct spi_master *master)
return -ENODEV;
/* convention: dynamically assigned bus IDs count down from the max */
- if (master->bus_num == 0) {
+ if (master->bus_num < 0) {
master->bus_num = atomic_dec_return(&dyn_bus_id);
dynamic = 1;
}