linux-kernel - [PATCH] dmaengine: idxd: make dsa_bus

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Date: Tue, 13 Feb 2024 11:43:15 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Fenghua Yu <fenghua.yu@...el.com>, Dave Jiang <dave.jiang@...el.com>, 
 Vinod Koul <vkoul@...nel.org>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] dmaengine: idxd: make dsa_bus_type const

Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the dsa_bus_type variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/dma/idxd/bus.c  | 2 +-
 drivers/dma/idxd/idxd.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/idxd/bus.c b/drivers/dma/idxd/bus.c
index 0c9e689a2e77..b83b27e04f2a 100644
--- a/drivers/dma/idxd/bus.c
+++ b/drivers/dma/idxd/bus.c
@@ -72,7 +72,7 @@ static int idxd_bus_uevent(const struct device *dev, struct kobj_uevent_env *env
 	return add_uevent_var(env, "MODALIAS=" IDXD_DEVICES_MODALIAS_FMT, 0);
 }

-struct bus_type dsa_bus_type = {
+const struct bus_type dsa_bus_type = {
 	.name = "dsa",
 	.match = idxd_config_bus_match,
 	.probe = idxd_config_bus_probe,
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 47de3f93ff1e..f14a660a2a34 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -516,7 +516,7 @@ static inline void idxd_set_user_intr(struct idxd_device *idxd, bool enable)
 	iowrite32(reg.bits, idxd->reg_base + IDXD_GENCFG_OFFSET);
 }

-extern struct bus_type dsa_bus_type;
+extern const struct bus_type dsa_bus_type;

 extern bool support_enqcmd;
 extern struct ida idxd_ida;

---
base-commit: de7d9cb3b064fdfb2e0e7706d14ffee20b762ad2
change-id: 20240213-bus_cleanup-idxd-8feaf2af5461

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>