From: Aaro Koskinen aaro.koskinen@nokia.com
[ Upstream commit f9981d4f50b475d7dbb70f3022b87a3c8bba9fd6 ]
Some error paths leave the bus id allocated. As a result the IDR allocation will fail after a deferred probe. Fix by freeing the bus id always on error.
Signed-off-by: Aaro Koskinen aaro.koskinen@nokia.com Message-Id: 20200304111740.27915-1-aaro.koskinen@nokia.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 26b91ee0855dc..c186d3a944cd0 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2452,7 +2452,7 @@ int spi_register_controller(struct spi_controller *ctlr) if (ctlr->use_gpio_descriptors) { status = spi_get_gpio_descs(ctlr); if (status) - return status; + goto free_bus_id; /* * A controller using GPIO descriptors always * supports SPI_CS_HIGH if need be. @@ -2462,7 +2462,7 @@ int spi_register_controller(struct spi_controller *ctlr) /* Legacy code path for GPIOs from DT */ status = of_spi_get_gpio_numbers(ctlr); if (status) - return status; + goto free_bus_id; } }
@@ -2470,17 +2470,14 @@ int spi_register_controller(struct spi_controller *ctlr) * Even if it's just one always-selected device, there must * be at least one chipselect. */ - if (!ctlr->num_chipselect) - return -EINVAL; + if (!ctlr->num_chipselect) { + status = -EINVAL; + goto free_bus_id; + }
status = device_add(&ctlr->dev); - if (status < 0) { - /* free bus id */ - mutex_lock(&board_lock); - idr_remove(&spi_master_idr, ctlr->bus_num); - mutex_unlock(&board_lock); - goto done; - } + if (status < 0) + goto free_bus_id; dev_dbg(dev, "registered %s %s\n", spi_controller_is_slave(ctlr) ? "slave" : "master", dev_name(&ctlr->dev)); @@ -2496,11 +2493,7 @@ int spi_register_controller(struct spi_controller *ctlr) status = spi_controller_initialize_queue(ctlr); if (status) { device_del(&ctlr->dev); - /* free bus id */ - mutex_lock(&board_lock); - idr_remove(&spi_master_idr, ctlr->bus_num); - mutex_unlock(&board_lock); - goto done; + goto free_bus_id; } } /* add statistics */ @@ -2515,7 +2508,12 @@ int spi_register_controller(struct spi_controller *ctlr) /* Register devices from the device tree and ACPI */ of_register_spi_devices(ctlr); acpi_register_spi_devices(ctlr); -done: + return status; + +free_bus_id: + mutex_lock(&board_lock); + idr_remove(&spi_master_idr, ctlr->bus_num); + mutex_unlock(&board_lock); return status; } EXPORT_SYMBOL_GPL(spi_register_controller);