linux-kernel - [PATCH 4/4] PM / devfreq: exynos-ppmu: Fix module autoload

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Date:   Wed, 19 Oct 2016 18:06:27 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     linux-kernel@...r.kernel.org
Cc:     Javier Martinez Canillas <javier@....samsung.com>,
        Kukjin Kim <kgene@...nel.org>, linux-pm@...r.kernel.org,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-samsung-soc@...r.kernel.org,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 4/4] PM / devfreq: exynos-ppmu: Fix module autoload

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/devfreq/event/exynos-ppmu.ko | grep alias
$

After this patch:

$ modinfo drivers/devfreq/event/exynos-ppmu.ko | grep alias
alias:          of:N*T*Csamsung,exynos-ppmu-v2C*
alias:          of:N*T*Csamsung,exynos-ppmu-v2
alias:          of:N*T*Csamsung,exynos-ppmuC*
alias:          of:N*T*Csamsung,exynos-ppmu

Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

---

 drivers/devfreq/event/exynos-ppmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/devfreq/event/exynos-ppmu.c b/drivers/devfreq/event/exynos-ppmu.c
index f55cf0eb2a66..a112034997eb 100644
--- a/drivers/devfreq/event/exynos-ppmu.c
+++ b/drivers/devfreq/event/exynos-ppmu.c
@@ -351,6 +351,7 @@ static const struct of_device_id exynos_ppmu_id_match[] = {
 	},
 	{ /* sentinel */ },
 };
+MODULE_DEVICE_TABLE(of, exynos_ppmu_id_match);
 
 static struct devfreq_event_ops *exynos_bus_get_ops(struct device_node *np)
 {
-- 
2.7.4