linux-kernel - [PATCH] video: fbdev: mmp: Fix deferred clk handling in mmphw

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Message-Id: <685f452cacc74f4983aaff2bc28a02a95e8aa8b7.1681414375.git.christophe.jaillet@wanadoo.fr>
Date:   Thu, 13 Apr 2023 21:33:17 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Helge Deller <deller@....de>, Cai Huoqing <cai.huoqing@...ux.dev>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH] video: fbdev: mmp: Fix deferred clk handling in mmphw_probe()

When dev_err_probe() is called, 'ret' holds the value of the previous
successful devm_request_irq() call.
'ret' should be assigned with a meaningful value before being used in
dev_err_probe().

While at it, use and return "PTR_ERR(ctrl->clk)" instead of a hard-coded
"-ENOENT" so that -EPROBE_DEFER is handled and propagated correctly.

Fixes: 81b63420564d ("video: fbdev: mmp: Make use of the helper function dev_err_probe()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/video/fbdev/mmp/hw/mmp_ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/mmp/hw/mmp_ctrl.c b/drivers/video/fbdev/mmp/hw/mmp_ctrl.c
index a9df8ee79810..51fbf02a0343 100644
--- a/drivers/video/fbdev/mmp/hw/mmp_ctrl.c
+++ b/drivers/video/fbdev/mmp/hw/mmp_ctrl.c
@@ -514,9 +514,9 @@ static int mmphw_probe(struct platform_device *pdev)
 	/* get clock */
 	ctrl->clk = devm_clk_get(ctrl->dev, mi->clk_name);
 	if (IS_ERR(ctrl->clk)) {
+		ret = PTR_ERR(ctrl->clk);
 		dev_err_probe(ctrl->dev, ret,
 			      "unable to get clk %s\n", mi->clk_name);
-		ret = -ENOENT;
 		goto failed;
 	}
 	clk_prepare_enable(ctrl->clk);
-- 
2.34.1