linux-kernel - [PATCH stable 4.14] usb: dwc3: fix PHY disable sequence

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Date:   Tue,  6 Sep 2022 16:04:04 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH stable 4.14] usb: dwc3: fix PHY disable sequence

From: Johan Hovold <johan+linaro@...nel.org>

commit d2ac7bef95c9ead307801ccb6cb6dfbeb14247bf upstream.

Generic PHYs must be powered-off before they can be tore down.

Similarly, suspending legacy PHYs after having powered them off makes no
sense.

Fix the dwc3_core_exit() (e.g. called during suspend) and open-coded
dwc3_probe() error-path sequences that got this wrong.

Note that this makes dwc3_core_exit() match the dwc3_core_init() error
path with respect to powering off the PHYs.

Fixes: 03c1fd622f72 ("usb: dwc3: core: add phy cleanup for probe error handling")
Fixes: c499ff71ff2a ("usb: dwc3: core: re-factor init and exit paths")
Cc: stable@...r.kernel.org      # 4.8
Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
Link: https://lore.kernel.org/r/20220804151001.23612-2-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[ johan: adjust context to 4.14 ]
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/usb/dwc3/core.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0e179274ba7c..2e93f633a0b6 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -656,15 +656,15 @@ static void dwc3_core_exit(struct dwc3 *dwc)
 {
 	dwc3_event_buffers_cleanup(dwc);
 
-	usb_phy_shutdown(dwc->usb2_phy);
-	usb_phy_shutdown(dwc->usb3_phy);
-	phy_exit(dwc->usb2_generic_phy);
-	phy_exit(dwc->usb3_generic_phy);
-
 	usb_phy_set_suspend(dwc->usb2_phy, 1);
 	usb_phy_set_suspend(dwc->usb3_phy, 1);
 	phy_power_off(dwc->usb2_generic_phy);
 	phy_power_off(dwc->usb3_generic_phy);
+
+	usb_phy_shutdown(dwc->usb2_phy);
+	usb_phy_shutdown(dwc->usb3_phy);
+	phy_exit(dwc->usb2_generic_phy);
+	phy_exit(dwc->usb3_generic_phy);
 }
 
 static bool dwc3_core_is_valid(struct dwc3 *dwc)
@@ -1288,16 +1288,16 @@ static int dwc3_probe(struct platform_device *pdev)
 err5:
 	dwc3_event_buffers_cleanup(dwc);
 
-	usb_phy_shutdown(dwc->usb2_phy);
-	usb_phy_shutdown(dwc->usb3_phy);
-	phy_exit(dwc->usb2_generic_phy);
-	phy_exit(dwc->usb3_generic_phy);
-
 	usb_phy_set_suspend(dwc->usb2_phy, 1);
 	usb_phy_set_suspend(dwc->usb3_phy, 1);
 	phy_power_off(dwc->usb2_generic_phy);
 	phy_power_off(dwc->usb3_generic_phy);
 
+	usb_phy_shutdown(dwc->usb2_phy);
+	usb_phy_shutdown(dwc->usb3_phy);
+	phy_exit(dwc->usb2_generic_phy);
+	phy_exit(dwc->usb3_generic_phy);
+
 	dwc3_ulpi_exit(dwc);
 
 err4:
-- 
2.35.1