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usb: Fix bootindex for portnr > 9

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We identify devices by their Open Firmware device paths.  The encoding
of the host controller and hub port numbers is incorrect:
usb_get_fw_dev_path() formats them in decimal, while SeaBIOS uses
hexadecimal.  When some port number > 9, SeaBIOS will miss the
bootindex (lucky case), or apply it to another device (unlucky case).

The relevant spec[*] agrees with SeaBIOS (and OVMF, for that matter).
Change %d to %x.

Bug can bite only with host controllers or hubs sporting more than ten
ports.  I'm not aware of any.

[*] Open Firmware Recommended Practice: Universal Serial Bus,
Version 1, Section 3.2.1 Device Node Address Representation
http://www.openfirmware.org/1275/bindings/usb/usb-1_0.ps

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

Note: xhci can be configured with up to 15 ports (default is 4 ports).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Markus Armbruster 2014-08-15 13:32:36 +02:00 committed by Gerd Hoffmann
parent c47c61be8d
commit 830cd54fca
1 changed files with 2 additions and 2 deletions
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4
hw/usb/bus.c
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@ -589,11 +589,11 @@ static char *usb_get_fw_dev_path(DeviceState *qdev)
nr = strtol(in, &in, 10);
if (in[0] == '.') {
/* some hub between root port and device */
pos += snprintf(fw_path + pos, fw_len - pos, "hub@%ld/", nr);
pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
in++;
} else {
/* the device itself */
pos += snprintf(fw_path + pos, fw_len - pos, "%s@%ld",
pos += snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
qdev_fw_name(qdev), nr);
break;
}