Re: FAILED: patch "[PATCH] spi: npcm-fiu: Disable clock in probe error path" failed to apply to 5.4-stable tree

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

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Hi Greg,

On Mon, Dec 28, 2020 at 12:00:27PM +0100, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 5.4-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.

Here is the backport along with 4c3a14fbc05a ("spi: npcm-fiu: simplify the
return expression of npcm_fiu_probe()") which makes backport easier.

--
Regards
Sudip

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From cefb8d3e297579898a170ae99f9bad4c0c5342a4 Mon Sep 17 00:00:00 2001
From: Qinglang Miao <miaoqinglang@huawei.com>
Date: Mon, 21 Sep 2020 21:11:06 +0800
Subject: [PATCH 1/2] spi: npcm-fiu: simplify the return expression of
 npcm_fiu_probe()

commit 4c3a14fbc05a09fc369fb68a86cdbf6f441a29f2 upstream

Simplify the return expression.

Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Link: https://lore.kernel.org/r/20200921131106.93228-1-miaoqinglang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
 drivers/spi/spi-npcm-fiu.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/spi/spi-npcm-fiu.c b/drivers/spi/spi-npcm-fiu.c
index 5ed7c9e017fb..561c68329133 100644
--- a/drivers/spi/spi-npcm-fiu.c
+++ b/drivers/spi/spi-npcm-fiu.c
@@ -677,7 +677,6 @@ static int npcm_fiu_probe(struct platform_device *pdev)
 	struct npcm_fiu_spi *fiu;
 	void __iomem *regbase;
 	struct resource *res;
-	int ret;
 	int id;
 
 	ctrl = devm_spi_alloc_master(dev, sizeof(*fiu));
@@ -736,11 +735,7 @@ static int npcm_fiu_probe(struct platform_device *pdev)
 	ctrl->num_chipselect = fiu->info->max_cs;
 	ctrl->dev.of_node = dev->of_node;
 
-	ret = devm_spi_register_master(dev, ctrl);
-	if (ret)
-		return ret;
-
-	return 0;
+	return devm_spi_register_master(dev, ctrl);
 }
 
 static int npcm_fiu_remove(struct platform_device *pdev)
-- 
2.11.0


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From 02b79219e662710c4ec8fcc4047cd9da8ce3c281 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Mon, 7 Dec 2020 09:17:16 +0100
Subject: [PATCH 2/2] spi: npcm-fiu: Disable clock in probe error path

commit 234266a5168bbe8220d263e3aa7aa80cf921c483 upstream

If the call to devm_spi_register_master() fails on probe of the NPCM FIU
SPI driver, the clock "fiu->clk" is erroneously not unprepared and
disabled.  Fix it.

Fixes: ace55c411b11 ("spi: npcm-fiu: add NPCM FIU controller driver")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v5.4+
Cc: Tomer Maimon <tmaimon77@gmail.com>
Link: https://lore.kernel.org/r/9ae62f4e1cfe542bec57ac2743e6fca9f9548f55.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
 drivers/spi/spi-npcm-fiu.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-npcm-fiu.c b/drivers/spi/spi-npcm-fiu.c
index 561c68329133..1e770d673905 100644
--- a/drivers/spi/spi-npcm-fiu.c
+++ b/drivers/spi/spi-npcm-fiu.c
@@ -677,7 +677,7 @@ static int npcm_fiu_probe(struct platform_device *pdev)
 	struct npcm_fiu_spi *fiu;
 	void __iomem *regbase;
 	struct resource *res;
-	int id;
+	int id, ret;
 
 	ctrl = devm_spi_alloc_master(dev, sizeof(*fiu));
 	if (!ctrl)
@@ -735,7 +735,11 @@ static int npcm_fiu_probe(struct platform_device *pdev)
 	ctrl->num_chipselect = fiu->info->max_cs;
 	ctrl->dev.of_node = dev->of_node;
 
-	return devm_spi_register_master(dev, ctrl);
+	ret = devm_spi_register_master(dev, ctrl);
+	if (ret)
+		clk_disable_unprepare(fiu->clk);
+
+	return ret;
 }
 
 static int npcm_fiu_remove(struct platform_device *pdev)
-- 
2.11.0