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usb: kbd: On a "usb reset" call usb_kbd_deregister() before calling usb_stop()

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We need to call usb_kbd_deregister() before calling usb_stop().

usbkbd's stdio_dev->priv points to the usb_device, and usb_kbd_testc
dereferences usb_device->privptr.

usb_stop zeros usb_device, leaving usb_device->privptr NULL, causing
bad things (tm) to happen once control returns to the main loop and
usb_kbd_testc gets called.

Calling usb_kbd_deregister() avoids this. Note that we do not allow
the "usb reset" to continue when the deregister fails. This will be fixed
in a later patch.

For the same reasons always fail "usb stop" if the usb_kbd_deregister() fails,
even in the force path. This can happen when CONFIG_SYS_STDIO_DEREGISTER is
not set.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2014-09-20 16:54:35 +02:00 committed by Marek Vasut
parent 0ea09dfe87
commit 6e78c74f62
1 changed files with 15 additions and 12 deletions
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27
common/cmd_usb.c
View file

@ -430,6 +430,16 @@ static int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
}
#endif /* CONFIG_USB_STORAGE */
static int do_usb_stop_keyboard(void)
{
#ifdef CONFIG_USB_KEYBOARD
if (usb_kbd_deregister() != 0) {
printf("USB not stopped: usbkbd still using USB\n");
return 1;
}
#endif
return 0;
}
/******************************************************************************
* usb command intepreter
@ -450,6 +460,8 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if ((strncmp(argv[1], "reset", 5) == 0) ||
(strncmp(argv[1], "start", 5) == 0)) {
bootstage_mark_name(BOOTSTAGE_ID_USB_START, "usb_start");
if (do_usb_stop_keyboard() != 0)
return 1;
usb_stop();
printf("(Re)start USB...\n");
if (usb_init() >= 0) {
@ -468,19 +480,10 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return 0;
}
if (strncmp(argv[1], "stop", 4) == 0) {
#ifdef CONFIG_USB_KEYBOARD
if (argc == 2) {
if (usb_kbd_deregister() != 0) {
printf("USB not stopped: usbkbd still"
" using USB\n");
return 1;
}
} else {
/* forced stop, switch console in to serial */
if (argc != 2)
console_assign(stdin, "serial");
usb_kbd_deregister();
}
#endif
if (do_usb_stop_keyboard() != 0)
return 1;
printf("stopping USB..\n");
usb_stop();
return 0;