linux-kernel - Re: [PATCH v3 3/7] clk: Add of_clk_hw_register() API for early clk drivers

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Date:   Wed, 10 Apr 2019 14:45:41 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 3/7] clk: Add of_clk_hw_register() API for early clk drivers

Quoting Jeffrey Hugo (2019-04-10 12:39:16)
> On 4/10/2019 10:53 AM, Stephen Boyd wrote:
> > Quoting Jeffrey Hugo (2019-04-08 14:46:11)
> >> On 4/4/2019 3:53 PM, Stephen Boyd wrote:
> >>> In some circumstances drivers register clks early and don't have access
> >>> to a struct device because the device model isn't initialized yet. Add
> >>> an API to let drivers register clks associated with a struct device_node
> >>> so that these drivers can participate in getting parent clks through DT.
> >>
> >> NACK.  This patch broke boot for me.  I had to pull the below from JTAG.
> >>    What do you need to debug this?
> >>
> > 
> > Here's a patch to try to squash in:
> 
> No dice.  Same issue.

Argh! dev_of_node() doesn't check for NULL device. :-/ I want to be
extremely lazy! Let's get this merged too. Thanks for the testing.

---8<---
diff --git a/include/linux/device.h b/include/linux/device.h
index b425a7ee04ce..0370dd0b3ae7 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1231,7 +1231,7 @@ static inline void device_lock_assert(struct device *dev)
 
 static inline struct device_node *dev_of_node(struct device *dev)
 {
-	if (!IS_ENABLED(CONFIG_OF))
+	if (!IS_ENABLED(CONFIG_OF) || !dev)
 		return NULL;
 	return dev->of_node;
 }