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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2016-01-25 20:30:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-03 13:26:30 -0800 |
| commit | 5363de75307e333d89df7531f9dd8310d973ecdb (patch) | |
| tree | 5c90ec1dbcf6d1626984ec6306db7d73ee8dd3ab /drivers/usb/core/hcd.c | |
| parent | d78540419866887345cec480016b0f87f6a5aca2 (diff) | |
| download | linux-5363de75307e333d89df7531f9dd8310d973ecdb.tar.gz linux-5363de75307e333d89df7531f9dd8310d973ecdb.tar.bz2 linux-5363de75307e333d89df7531f9dd8310d973ecdb.zip | |
usb: core: switch bus numbering to using idr
USB bus numbering is based on directly dealing with bitmaps and
defines a separate list of busses.
This can be simplified and unified by using existing idr functionality.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/hcd.c')
| -rw-r--r-- | drivers/usb/core/hcd.c | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 232c8c93dd3a..cf3eb22dbeb4 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -90,12 +90,11 @@ unsigned long usb_hcds_loaded; EXPORT_SYMBOL_GPL(usb_hcds_loaded); /* host controllers we manage */ -LIST_HEAD (usb_bus_list); -EXPORT_SYMBOL_GPL (usb_bus_list); +DEFINE_IDR (usb_bus_idr); +EXPORT_SYMBOL_GPL (usb_bus_idr); /* used when allocating bus numbers */ #define USB_MAXBUS 64 -static DECLARE_BITMAP(busmap, USB_MAXBUS); /* used when updating list of hcds */ DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */ @@ -996,8 +995,6 @@ static void usb_bus_init (struct usb_bus *bus) bus->bandwidth_int_reqs = 0; bus->bandwidth_isoc_reqs = 0; mutex_init(&bus->usb_address0_mutex); - - INIT_LIST_HEAD (&bus->bus_list); } /*-------------------------------------------------------------------------*/ @@ -1018,16 +1015,12 @@ static int usb_register_bus(struct usb_bus *bus) int busnum; mutex_lock(&usb_bus_list_lock); - busnum = find_next_zero_bit(busmap, USB_MAXBUS, 1); - if (busnum >= USB_MAXBUS) { - printk (KERN_ERR "%s: too many buses\n", usbcore_name); + busnum = idr_alloc(&usb_bus_idr, bus, 1, USB_MAXBUS, GFP_KERNEL); + if (busnum < 0) { + pr_err("%s: failed to get bus number\n", usbcore_name); goto error_find_busnum; } - set_bit(busnum, busmap); bus->busnum = busnum; - - /* Add it to the local list of buses */ - list_add (&bus->bus_list, &usb_bus_list); mutex_unlock(&usb_bus_list_lock); usb_notify_add_bus(bus); @@ -1059,12 +1052,10 @@ static void usb_deregister_bus (struct usb_bus *bus) * itself up */ mutex_lock(&usb_bus_list_lock); - list_del (&bus->bus_list); + idr_remove(&usb_bus_idr, bus->busnum); mutex_unlock(&usb_bus_list_lock); usb_notify_remove_bus(bus); - - clear_bit(bus->busnum, busmap); } /** |