linux-kernel - [PATCH 4.9 53/59] ARM: 8631/1: clkdev: Detect errors in clk_hw_register

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Date:   Fri, 13 Jan 2017 13:02:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
        Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH 4.9 53/59] ARM: 8631/1: clkdev: Detect errors in clk_hw_register_clkdev() for mass registration

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert@...ux-m68k.org>

commit 9388093db44356af911adf3d355b7544a13a63cd upstream.

Unlike clk_register_clkdev(), clk_hw_register_clkdev() doesn't check for
passed error objects from a previous registration call. Hence the caller
of clk_hw_register_*() has to check for errors before calling
clk_hw_register_clkdev*().

Make clk_hw_register_clkdev() more similar to clk_register_clkdev() by
adding this error check, removing the burden from callers that do mass
registration.

Fixes: e4f1b49bda6d6aa2 ("clkdev: Add clk_hw based registration APIs")
Fixes: 944b9a41e004534f ("clk: ls1x: Migrate to clk_hw based OF and registration APIs")
Fixes: 44ce9a9ae977736f ("MIPS: TXx9: Convert to Common Clock Framework")
Fixes: f48d947a162dfa9d ("clk: clps711x: Migrate to clk_hw based OF and registration APIs")
Fixes: b4626a7f489238a5 ("CLK: Add Loongson1C clock support")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/clk/clkdev.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -448,12 +448,20 @@ EXPORT_SYMBOL(clk_register_clkdev);
  *
  * con_id or dev_id may be NULL as a wildcard, just as in the rest of
  * clkdev.
+ *
+ * To make things easier for mass registration, we detect error clk_hws
+ * from a previous clk_hw_register_*() call, and return the error code for
+ * those.  This is to permit this function to be called immediately
+ * after clk_hw_register_*().
  */
 int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
 	const char *dev_id)
 {
 	struct clk_lookup *cl;
 
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
 	/*
 	 * Since dev_id can be NULL, and NULL is handled specially, we must
 	 * pass it as either a NULL format string, or with "%s".