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authorDan Williams <dan.j.williams@intel.com>2014-06-17 16:16:27 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-17 17:04:39 -0700
commit6c79fe4afcb0450bd638f6e959e512aad270ff2f (patch)
tree10e7f6a082cd83d15139ce3e666e061ca69d5f0b /drivers/usb/core
parentb658b8f5c09d3d1db9641c9d520b36b3e4c0d744 (diff)
downloadlinux-stericsson-6c79fe4afcb0450bd638f6e959e512aad270ff2f.tar.gz
usb: quiet peer failure warning, disable poweroff
In the case where platform firmware has specified conflicting values for port locations it is confusing and otherwise not helpful to throw a backtrace. Instead, include enough information to determine that firmware has done something wrong and globally disable port poweroff. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/port.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 62036faf56c0..9347ade7d5fe 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -21,6 +21,8 @@
#include "hub.h"
+static int usb_port_block_power_off;
+
static const struct attribute_group *port_dev_group[];
static ssize_t connect_type_show(struct device *dev,
@@ -142,6 +144,9 @@ static int usb_port_runtime_suspend(struct device *dev)
== PM_QOS_FLAGS_ALL)
return -EAGAIN;
+ if (usb_port_block_power_off)
+ return -EBUSY;
+
usb_autopm_get_interface(intf);
retval = usb_hub_set_port_power(hdev, hub, port1, false);
usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
@@ -190,11 +195,19 @@ static int link_peers(struct usb_port *left, struct usb_port *right)
if (left->peer || right->peer) {
struct usb_port *lpeer = left->peer;
struct usb_port *rpeer = right->peer;
-
- WARN(1, "failed to peer %s and %s (%s -> %p) (%s -> %p)\n",
- dev_name(&left->dev), dev_name(&right->dev),
- dev_name(&left->dev), lpeer,
- dev_name(&right->dev), rpeer);
+ char *method;
+
+ if (left->location && left->location == right->location)
+ method = "location";
+ else
+ method = "default";
+
+ pr_warn("usb: failed to peer %s and %s by %s (%s:%s) (%s:%s)\n",
+ dev_name(&left->dev), dev_name(&right->dev), method,
+ dev_name(&left->dev),
+ lpeer ? dev_name(&lpeer->dev) : "none",
+ dev_name(&right->dev),
+ rpeer ? dev_name(&rpeer->dev) : "none");
return -EBUSY;
}
@@ -251,6 +264,7 @@ static void link_peers_report(struct usb_port *left, struct usb_port *right)
dev_warn(&left->dev, "failed to peer to %s (%d)\n",
dev_name(&right->dev), rc);
pr_warn_once("usb: port power management may be unreliable\n");
+ usb_port_block_power_off = 1;
}
}