linux-kernel - [PATCH 1/7] mmc: sdio: store owner from modules with sdio_register

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Message-Id: <20240329-module-owner-sdio-v1-1-e4010b11ccaa@linaro.org>
Date: Fri, 29 Mar 2024 18:24:31 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 Marcel Holtmann <marcel@...tmann.org>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Kalle Valo <kvalo@...nel.org>, Jeff Johnson <jjohnson@...nel.org>, 
 Arend van Spriel <arend.vanspriel@...adcom.com>, 
 Brian Norris <briannorris@...omium.org>, 
 Jérôme Pouiller <jerome.pouiller@...abs.com>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-bluetooth@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-wireless@...r.kernel.org, 
 ath10k@...ts.infradead.org, brcm80211@...ts.linux.dev, 
 brcm80211-dev-list.pdl@...adcom.com, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 1/7] mmc: sdio: store owner from modules with
 sdio_register_driver()

Modules registering driver with sdio_register_driver() might
forget to set .owner field.  The field is used by some of other kernel
parts for reference counting (try_module_get()), so it is expected that
drivers will set it.

Solve the problem by moving this task away from the drivers to the core
code, just like we did for platform_driver in
commit 9447057eaff8 ("platform_device: use a macro instead of
platform_driver_register").

Since many drivers forget to set the .owner, this effectively will fix
them.  Examples of fixed drivers are: ath6kl, b43, btsdio.c, ks7010,
libertas, MediaTek WiFi drivers, Realtek WiFi drivers, rsi, siano,
wilc1000, wl1251 and more.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/mmc/core/sdio_bus.c   | 9 ++++++---
 include/linux/mmc/sdio_func.h | 5 ++++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
index 71d885fbc228..c5fdfe2325f8 100644
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -265,16 +265,19 @@ void sdio_unregister_bus(void)
 }
 
 /**
- *	sdio_register_driver - register a function driver
+ *	__sdio_register_driver - register a function driver
  *	@drv: SDIO function driver
+ *	@owner: owning module/driver
  */
-int sdio_register_driver(struct sdio_driver *drv)
+int __sdio_register_driver(struct sdio_driver *drv, struct module *owner)
 {
 	drv->drv.name = drv->name;
 	drv->drv.bus = &sdio_bus_type;
+	drv->drv.owner = owner;
+
 	return driver_register(&drv->drv);
 }
-EXPORT_SYMBOL_GPL(sdio_register_driver);
+EXPORT_SYMBOL_GPL(__sdio_register_driver);
 
 /**
  *	sdio_unregister_driver - unregister a function driver
diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
index 478855b8e406..fed1f5f4a8d3 100644
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -106,7 +106,10 @@ struct sdio_driver {
 	.class = (dev_class), \
 	.vendor = SDIO_ANY_ID, .device = SDIO_ANY_ID
 
-extern int sdio_register_driver(struct sdio_driver *);
+/* use a macro to avoid include chaining to get THIS_MODULE */
+#define sdio_register_driver(drv) \
+	__sdio_register_driver(drv, THIS_MODULE)
+extern int __sdio_register_driver(struct sdio_driver *, struct module *);
 extern void sdio_unregister_driver(struct sdio_driver *);
 
 /**

-- 
2.34.1