diff options
Diffstat (limited to 'drivers/staging/usbip/vhci_hcd.c')
| -rw-r--r-- | drivers/staging/usbip/vhci_hcd.c | 39 |
1 files changed, 11 insertions, 28 deletions
diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c index f708cbaee16b..12a9a5fbc797 100644 --- a/drivers/staging/usbip/vhci_hcd.c +++ b/drivers/staging/usbip/vhci_hcd.c @@ -178,44 +178,32 @@ void rh_port_disconnect(int rhport) | USB_PORT_STAT_C_RESET) << 16) /* - * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without - * suspend/resume support. But, it is modified to provide multiple ports. + * Returns 0 if the status hasn't changed, or the number of bytes in buf. + * Ports are 0-indexed from the HCD point of view, + * and 1-indexed from the USB core pointer of view. * * @buf: a bitmap to show which port status has been changed. - * bit 0: reserved or used for another purpose? + * bit 0: reserved * bit 1: the status of port 0 has been changed. * bit 2: the status of port 1 has been changed. * ... - * bit 7: the status of port 6 has been changed. - * bit 8: the status of port 7 has been changed. - * ... - * bit 15: the status of port 14 has been changed. - * - * So, the maximum number of ports is 31 ( port 0 to port 30) ? - * - * The return value is the actual transferred length in byte. If nothing has - * been changed, return 0. In the case that the number of ports is less than or - * equal to 6 (VHCI_NPORTS==7), return 1. - * */ static int vhci_hub_status(struct usb_hcd *hcd, char *buf) { struct vhci_hcd *vhci; unsigned long flags; - int retval = 0; - - /* the enough buffer is allocated according to USB_MAXCHILDREN */ - unsigned long *event_bits = (unsigned long *) buf; + int retval; int rhport; int changed = 0; - *event_bits = 0; + retval = DIV_ROUND_UP(VHCI_NPORTS + 1, 8); + memset(buf, 0, retval); vhci = hcd_to_vhci(hcd); spin_lock_irqsave(&vhci->lock, flags); if (!HCD_HW_ACCESSIBLE(hcd)) { - usbip_dbg_vhci_rh("hw accessible flag in on?\n"); + usbip_dbg_vhci_rh("hw accessible flag not on?\n"); goto done; } @@ -223,9 +211,9 @@ static int vhci_hub_status(struct usb_hcd *hcd, char *buf) for (rhport = 0; rhport < VHCI_NPORTS; rhport++) { if ((vhci->port_status[rhport] & PORT_C_MASK)) { /* The status of a port has been changed, */ - usbip_dbg_vhci_rh("port %d is changed\n", rhport); + usbip_dbg_vhci_rh("port %d status changed\n", rhport); - *event_bits |= 1 << (rhport + 1); + buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8; changed = 1; } } @@ -235,14 +223,9 @@ static int vhci_hub_status(struct usb_hcd *hcd, char *buf) if (hcd->state == HC_STATE_SUSPENDED) usb_hcd_resume_root_hub(hcd); - if (changed) - retval = 1 + (VHCI_NPORTS / 8); - else - retval = 0; - done: spin_unlock_irqrestore(&vhci->lock, flags); - return retval; + return changed ? retval : 0; } /* See hub_configure in hub.c */ |