Once device_add() failed, we should call put_device() to decrement reference count for cleanup. Or it could cause memory leak.

Found by code review.

Cc: stable@vger.kernel.org Fixes: f9981d4f50b4 ("spi: spi_register_controller(): free bus id on error paths") Signed-off-by: Ma Ke make_ruc2021@163.com --- drivers/spi/spi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index ff1add2ecb91..6477c2f4ae82 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -3339,8 +3339,10 @@ int spi_register_controller(struct spi_controller *ctlr) ctlr->last_cs[idx] = SPI_INVALID_CS;

status = device_add(&ctlr->dev); - if (status < 0) + if (status < 0) { + put_device(&ctlr->dev); goto free_bus_id; + } dev_dbg(dev, "registered %s %s\n", spi_controller_is_target(ctlr) ? "target" : "host", dev_name(&ctlr->dev)); @@ -3356,6 +3358,7 @@ int spi_register_controller(struct spi_controller *ctlr) status = spi_controller_initialize_queue(ctlr); if (status) { device_del(&ctlr->dev); + put_device(&ctlr->dev); goto free_bus_id; } }