target/linux/generic/backport-4.14/030-v4.17-0002-usb-dwc2-dwc2_vbus_supply_init-fix-error-check.patch

   1 From 438fea2a6325933868aebc20279e2669c9a21207 Mon Sep 17 00:00:00 2001
   2 From: Tomeu Vizoso <tomeu.vizoso@collabora.com>
   3 Date: Mon, 26 Mar 2018 11:00:01 +0200
   4 Subject: [PATCH] usb: dwc2: dwc2_vbus_supply_init: fix error check
   5
   6 devm_regulator_get_optional returns -ENODEV if the regulator isn't
   7 there, so if that's the case we have to make sure not to leave -ENODEV
   8 in the regulator pointer.
   9
  10 Also, make sure we return 0 in that case, but correctly propagate any
  11 other errors. Also propagate the error from _dwc2_hcd_start.
  12
  13 Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external vbus supply")
  14 Cc: Amelie Delaunay <amelie.delaunay@st.com>
  15 Reviewed-by: Amelie Delaunay <amelie.delaunay@st.com>
  16 Reviewed-by: Heiko Stuebner <heiko@sntech.de>
  17 Reviewed-by: Grigor Tovmasyan <tovmasya@synopsys.com>
  18 Tested-by: Heiko Stuebner <heiko@sntech.de>
  19 Acked-by: Minas Harutyunyan <hminas@synopsys.com>
  20 Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
  21 Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
  22 ---
  23  drivers/usb/dwc2/hcd.c | 13 ++++++++-----
  24  1 file changed, 8 insertions(+), 5 deletions(-)
  25
  26 --- a/drivers/usb/dwc2/hcd.c
  27 +++ b/drivers/usb/dwc2/hcd.c
  28 @@ -361,9 +361,14 @@ static void dwc2_gusbcfg_init(struct dwc
  29
  30  static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
  31  {
  32 +       int ret;
  33 +
  34         hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
  35 -       if (IS_ERR(hsotg->vbus_supply))
  36 -               return 0;
  37 +       if (IS_ERR(hsotg->vbus_supply)) {
  38 +               ret = PTR_ERR(hsotg->vbus_supply);
  39 +               hsotg->vbus_supply = NULL;
  40 +               return ret == -ENODEV ? 0 : ret;
  41 +       }
  42
  43         return regulator_enable(hsotg->vbus_supply);
  44  }
  45 @@ -4371,9 +4376,7 @@ static int _dwc2_hcd_start(struct usb_hc
  46
  47         spin_unlock_irqrestore(&hsotg->lock, flags);
  48
  49 -       dwc2_vbus_supply_init(hsotg);
  50 -
  51 -       return 0;
  52 +       return dwc2_vbus_supply_init(hsotg);
  53  }
  54
  55  /*