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add note for recursive calls of process_device_unplugged() in case of hub

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hathach 2022-06-16 14:37:57 +07:00
parent 7df7590f7f
commit f4a7b5b80c
2 changed files with 21 additions and 18 deletions
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2
examples/host/cdc_msc_hid/src/tusb_config.h
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@ -81,7 +81,7 @@
// Size of buffer to hold descriptors and other data used for enumeration
#define CFG_TUH_ENUMERATION_BUFSIZE 256
#define CFG_TUH_HUB 1
#define CFG_TUH_HUB 1 // number of supported hubs
#define CFG_TUH_CDC 1
#define CFG_TUH_HID 4 // typical keyboard + mouse device can have 3-4 HID interfaces
#define CFG_TUH_MSC 1

37
src/host/usbh.c
View File

@ -1089,6 +1089,12 @@ uint8_t tuh_descriptor_get_serial_string_sync(uint8_t daddr, uint16_t language_i
//
//--------------------------------------------------------------------+
TU_ATTR_ALWAYS_INLINE
static inline bool is_hub_addr(uint8_t daddr)
{
return (CFG_TUH_HUB > 0) && (daddr > CFG_TUH_DEVICE_MAX);
}
// a device unplugged from rhport:hub_addr:hub_port
static void process_device_unplugged(uint8_t rhport, uint8_t hub_addr, uint8_t hub_port)
{
@ -1101,21 +1107,24 @@ static void process_device_unplugged(uint8_t rhport, uint8_t hub_addr, uint8_t h
// TODO Hub multiple level
if (dev->rhport == rhport &&
(hub_addr == 0 || dev->hub_addr == hub_addr) && // hub_addr == 0 & hub_port == 0 means roothub
(hub_port == 0 || dev->hub_port == hub_port) &&
(hub_addr == 0 || dev->hub_addr == hub_addr) && // hub_addr = 0 means roothub
(hub_port == 0 || dev->hub_port == hub_port) && // hub_port = 0 means all devices of downstream hub
dev->connected)
{
TU_LOG2(" Address = %u\r\n", dev_addr);
// If the device itself is a usb hub, unplug downstream devices.
if (dev_addr > CFG_TUH_DEVICE_MAX)
if (is_hub_addr(dev_addr))
{
TU_LOG(USBH_DBG_LVL, "HUB address = %u is unmounted\r\n", dev_addr);
// If the device itself is a usb hub, unplug downstream devices.
// FIXME un-roll recursive calls to prevent potential stack overflow
process_device_unplugged(rhport, dev_addr, 0);
}else
{
// Invoke callback before closing driver
if (tuh_umount_cb) tuh_umount_cb(dev_addr);
}
// Invoke callback before close driver
if (tuh_umount_cb) tuh_umount_cb(dev_addr);
// Close class driver
for (uint8_t drv_id = 0; drv_id < USBH_CLASS_DRIVER_COUNT; drv_id++)
{
@ -1395,12 +1404,6 @@ static bool enum_new_device(hcd_event_t* event)
return true;
}
TU_ATTR_ALWAYS_INLINE
static inline bool is_hub_addr(uint8_t daddr)
{
return daddr > CFG_TUH_DEVICE_MAX;
}
static uint8_t get_new_address(bool is_hub)
{
uint8_t start;
@ -1577,10 +1580,10 @@ void usbh_driver_set_config_complete(uint8_t dev_addr, uint8_t itf_num)
{
enum_full_complete();
#if CFG_TUH_HUB
// skip device mount callback for hub
if ( !is_hub_addr(dev_addr) )
#endif
if (is_hub_addr(dev_addr))
{
TU_LOG(USBH_DBG_LVL, "HUB address = %u is mounted\r\n", dev_addr);
}else
{
// Invoke callback if available
if (tuh_mount_cb) tuh_mount_cb(dev_addr);