| Message ID | 20171016102758.22444-1-l.stach@pengutronix.de (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 42bdd7061a6e24d7b21d3d21973615fecef544ef |
| Headers | show |
On Mon, Oct 16, 2017 at 12:27:58PM +0200, Lucas Stach wrote: > On systems where some controllers get a dynamic ID assigned and some have > a fixed number from DT, the current implemention might run into an IDR Please don't resubmit patches that have already been applied, you should submit patches against current code in the tree you're expecting things to be applied to. If any updates are needed to a patch that's already been applied you should submit incremental patches which make those updates. This avoids having to change published git commits which could cause problems for people working against git.
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 6e65524cbfd9..e8b5a5e21b2e 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -45,7 +45,6 @@ #define CREATE_TRACE_POINTS #include <trace/events/spi.h> -#define SPI_DYN_FIRST_BUS_NUM 0 static DEFINE_IDR(spi_master_idr); @@ -2086,7 +2085,7 @@ int spi_register_controller(struct spi_controller *ctlr) struct device *dev = ctlr->dev.parent; struct boardinfo *bi; int status = -ENODEV; - int id; + int id, first_dynamic; if (!dev) return -ENODEV; @@ -2116,9 +2115,15 @@ int spi_register_controller(struct spi_controller *ctlr) } } if (ctlr->bus_num < 0) { + first_dynamic = of_alias_get_highest_id("spi"); + if (first_dynamic < 0) + first_dynamic = 0; + else + first_dynamic++; + mutex_lock(&board_lock); - id = idr_alloc(&spi_master_idr, ctlr, SPI_DYN_FIRST_BUS_NUM, 0, - GFP_KERNEL); + id = idr_alloc(&spi_master_idr, ctlr, first_dynamic, + 0, GFP_KERNEL); mutex_unlock(&board_lock); if (WARN(id < 0, "couldn't get idr")) return id;
On systems where some controllers get a dynamic ID assigned and some have a fixed number from DT, the current implemention might run into an IDR collision if the dynamic controllers gets probed first and get an IDR number, which is later requested by the controller with the fixed numbering. When this happens the fixed controller will fail to register with the SPI core. Fix this by skipping all known alias numbers when assigning the dynamic IDs. Fixes: 9b61e302210e (spi: Pick spi bus number from Linux idr or spi alias) Signed-off-by: Lucas Stach <l.stach@pengutronix.de> --- v2: fix regression when no aliases are present --- drivers/spi/spi.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)