linux-kernel - [PATCH v2] phy: mapphone-mdm6600: Fix PM error handling in phy_mdm6600

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Message-Id: <20220301024615.31899-1-linmq006@gmail.com>
Date:   Tue,  1 Mar 2022 02:46:11 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Miaoqian Lin <linmq006@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] phy: mapphone-mdm6600: Fix PM error handling in phy_mdm6600_probe

The pm_runtime_enable will increase power disable depth.
If the probe fails, we should use pm_runtime_disable() to balance
pm_runtime_enable(). And use pm_runtime_dont_use_autosuspend() to
undo pm_runtime_use_autosuspend()
In the PM Runtime docs:
    Drivers in ->remove() callback should undo the runtime PM changes done
    in ->probe(). Usually this means calling pm_runtime_disable(),
    pm_runtime_dont_use_autosuspend() etc.

We should do this in error handling.

Fixes: f7f50b2 ("phy: mapphone-mdm6600: Add runtime PM support for n_gsm on USB suspend")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- remove unused label
- add pm_runtime_dont_use_autosuspend
---
 drivers/phy/motorola/phy-mapphone-mdm6600.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/motorola/phy-mapphone-mdm6600.c b/drivers/phy/motorola/phy-mapphone-mdm6600.c
index 5172971f4c36..3cd4d51c247c 100644
--- a/drivers/phy/motorola/phy-mapphone-mdm6600.c
+++ b/drivers/phy/motorola/phy-mapphone-mdm6600.c
@@ -629,7 +629,8 @@ static int phy_mdm6600_probe(struct platform_device *pdev)
 cleanup:
 	if (error < 0)
 		phy_mdm6600_device_power_off(ddata);
-
+	pm_runtime_disable(ddata->dev);
+	pm_runtime_dont_use_autosuspend(ddata->dev);
 	return error;
 }
 
-- 
2.17.1