lkml.org 
[lkml]   [2018]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3] usb: dwc2: dwc2_vbus_supply_init: fix error check
Date
devm_regulator_get_optional returns -ENODEV if the regulator isn't
there, so if that's the case we have to make sure not to leave -ENODEV
in the regulator pointer.

Also, make sure we return 0 in that case, but correctly propagate any
other errors. Also propagate the error from _dwc2_hcd_start.

Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external vbus supply")
Cc: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

---

v2: Only overwrite the error in the pointer after checking it (Heiko
Stübner <heiko@sntech.de>)
v3: Remove hunks that shouldn't be in this patch
---
drivers/usb/dwc2/hcd.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index dcfda5eb4cac..863aed20517f 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -359,8 +359,13 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
{
hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
- if (IS_ERR(hsotg->vbus_supply))
+ if (PTR_ERR(hsotg->vbus_supply) == -ENODEV) {
+ hsotg->vbus_supply = NULL;
return 0;
+ } else if (IS_ERR(hsotg->vbus_supply)) {
+ hsotg->vbus_supply = NULL;
+ return PTR_ERR(hsotg->vbus_supply);
+ }

return regulator_enable(hsotg->vbus_supply);
}
@@ -4342,9 +4347,7 @@ static int _dwc2_hcd_start(struct usb_hcd *hcd)

spin_unlock_irqrestore(&hsotg->lock, flags);

- dwc2_vbus_supply_init(hsotg);
-
- return 0;
+ return dwc2_vbus_supply_init(hsotg);
}

/*
--
2.14.3
\
 
 \ /
  Last update: 2018-03-22 14:16    [W:0.375 / U:0.688 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site