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usb: dm: Make "usb info" use usb_for_each_root_dev() 

The old dm "usb info" implementation has several issues:

1) NULL pointer deref when a bus has no children
2) Not showing usb devices on busses without an emulated root-hub (otg host)
3) Attempting to show devices on inactive busses
4) "usb info" Would cause some hosts to get re-probed something which only
   "usb reset" should do

TL;DR: proper iterating over usb bus root devs is hard, use the helper
for it.

Reported-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2016-07-03 20:22:05 +02:00 committed by Marek Vasut
parent 2138fd6d5d
commit e6e188f562
1 changed files with 6 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
cmd/usb.c
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@ -593,39 +593,20 @@ static void do_usb_start(void)
} }
#ifdef CONFIG_DM_USB #ifdef CONFIG_DM_USB
static void show_info(struct udevice *dev) static void usb_show_info(struct usb_device *udev)
{ {
struct udevice *child; struct udevice *child;
struct usb_device *udev;
udev = dev_get_parent_priv(dev);
usb_display_desc(udev); usb_display_desc(udev);
usb_display_config(udev); usb_display_config(udev);
for (device_find_first_child(dev, &child); for (device_find_first_child(udev->dev, &child);
child; child;
device_find_next_child(&child)) { device_find_next_child(&child)) {
if (device_active(child)) if (device_active(child)) {
show_info(child); udev = dev_get_parent_priv(child);
usb_show_info(udev);
} }
} }
static int usb_device_info(void)
{
struct udevice *bus;
for (uclass_first_device(UCLASS_USB, &bus);
bus;
uclass_next_device(&bus)) {
struct udevice *hub;
device_find_first_child(bus, &hub);
if (device_get_uclass_id(hub) == UCLASS_USB_HUB &&
device_active(hub)) {
show_info(hub);
}
}
return 0;
} }
#endif #endif
@ -681,7 +662,7 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if (strncmp(argv[1], "inf", 3) == 0) { if (strncmp(argv[1], "inf", 3) == 0) {
if (argc == 2) { if (argc == 2) {
#ifdef CONFIG_DM_USB #ifdef CONFIG_DM_USB
usb_device_info(); usb_for_each_root_dev(usb_show_info);
#else #else
int d; int d;
for (d = 0; d < USB_MAX_DEVICE; d++) { for (d = 0; d < USB_MAX_DEVICE; d++) {