From dc93fe4bcffb58041140bbdc5fdebaf4af34a000 Mon Sep 17 00:00:00 2001
From: Russ Weight <russell.h.weight@intel.com>
Date: Mon, 18 Oct 2021 17:24:01 -0700
Subject: [PATCH] spi: altera: Change to dynamic allocation of spi id
Git-commit: f09f6dfef8ce7b70a240cf83811e2b1909c3e47b
Patch-mainline: v5.15
References: stable-5.14.19
[ Upstream commit f09f6dfef8ce7b70a240cf83811e2b1909c3e47b ]
The spi-altera driver has two flavors: platform and dfl. I'm seeing
a case where I have both device types in the same machine, and they
are conflicting on the SPI ID:
... kernel: couldn't get idr
... kernel: WARNING: CPU: 28 PID: 912 at drivers/spi/spi.c:2920 spi_register_controller.cold+0x84/0xc0a
Both the platform and dfl drivers use the parent's driver ID as the SPI
ID. In the error case, the parent devices are dfl_dev.4 and
subdev_spi_altera.4.auto. When the second spi-master is created, the
failure occurs because the SPI ID of 4 has already been allocated.
Change the ID allocation to dynamic (by initializing bus_num to -1) to
avoid duplicate SPI IDs.
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Link: https://lore.kernel.org/r/20211019002401.24041-1-russell.h.weight@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/spi/spi-altera-dfl.c | 2 +-
drivers/spi/spi-altera-platform.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-altera-dfl.c b/drivers/spi/spi-altera-dfl.c
index 39a3e1a032e0..59a5b42c7122 100644
--- a/drivers/spi/spi-altera-dfl.c
+++ b/drivers/spi/spi-altera-dfl.c
@@ -140,7 +140,7 @@ static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)
if (!master)
return -ENOMEM;
- master->bus_num = dfl_dev->id;
+ master->bus_num = -1;
hw = spi_master_get_devdata(master);
diff --git a/drivers/spi/spi-altera-platform.c b/drivers/spi/spi-altera-platform.c
index f7a7c14e3679..65147aae82a1 100644
--- a/drivers/spi/spi-altera-platform.c
+++ b/drivers/spi/spi-altera-platform.c
@@ -48,7 +48,7 @@ static int altera_spi_probe(struct platform_device *pdev)
return err;
/* setup the master state. */
- master->bus_num = pdev->id;
+ master->bus_num = -1;
if (pdata) {
if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
--
2.26.2