diff options
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 | |
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')
-rw-r--r-- | drivers/usb/core/devices.c | 10 | ||||
-rw-r--r-- | drivers/usb/core/hcd.c | 21 | ||||
-rw-r--r-- | drivers/usb/core/usb.c | 1 | ||||
-rw-r--r-- | drivers/usb/host/r8a66597-hcd.c | 9 | ||||
-rw-r--r-- | drivers/usb/mon/mon_main.c | 5 |
5 files changed, 13 insertions, 33 deletions
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c index b35a6a52210f..6118a04f0b84 100644 --- a/drivers/usb/core/devices.c +++ b/drivers/usb/core/devices.c @@ -110,13 +110,6 @@ static const char format_endpt[] = /* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=D?s */ "E: Ad=%02x(%c) Atr=%02x(%-4s) MxPS=%4d Ivl=%d%cs\n"; - -/* - * Need access to the driver and USB bus lists. - * extern struct list_head usb_bus_list; - * However, these will come from functions that return ptrs to each of them. - */ - /* * Wait for an connect/disconnect event to happen. We initialize * the event counter with an odd number, and each event will increment @@ -618,6 +611,7 @@ static ssize_t usb_device_read(struct file *file, char __user *buf, struct usb_bus *bus; ssize_t ret, total_written = 0; loff_t skip_bytes = *ppos; + int id; if (*ppos < 0) return -EINVAL; @@ -628,7 +622,7 @@ static ssize_t usb_device_read(struct file *file, char __user *buf, mutex_lock(&usb_bus_list_lock); /* print devices for all busses */ - list_for_each_entry(bus, &usb_bus_list, bus_list) { + idr_for_each_entry(&usb_bus_idr, bus, id) { /* recurse through all children of the root hub */ if (!bus_to_hcd(bus)->rh_registered) continue; 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); } /** diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 16ade41759cd..524c9822d2bb 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -1115,6 +1115,7 @@ static void __exit usb_exit(void) bus_unregister(&usb_bus_type); usb_acpi_unregister(); usb_debugfs_cleanup(); + idr_destroy(&usb_bus_idr); } subsys_initcall(usb_init); diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c index 4cbd0633c5c2..1ef887361ac0 100644 --- a/drivers/usb/host/r8a66597-hcd.c +++ b/drivers/usb/host/r8a66597-hcd.c @@ -2099,13 +2099,8 @@ static void r8a66597_check_detect_child(struct r8a66597 *r8a66597, memset(now_map, 0, sizeof(now_map)); - list_for_each_entry(bus, &usb_bus_list, bus_list) { - if (!bus->root_hub) - continue; - - if (bus->busnum != hcd->self.busnum) - continue; - + bus = idr_find(&usb_bus_idr, hcd->self.busnum); + if (bus && bus->root_hub) { collect_usb_address_map(bus->root_hub, now_map); update_usb_address_map(r8a66597, bus->root_hub, now_map); } diff --git a/drivers/usb/mon/mon_main.c b/drivers/usb/mon/mon_main.c index fec3f1128fdc..9b87efb0e50d 100644 --- a/drivers/usb/mon/mon_main.c +++ b/drivers/usb/mon/mon_main.c @@ -349,7 +349,7 @@ struct mon_bus *mon_bus_lookup(unsigned int num) static int __init mon_init(void) { struct usb_bus *ubus; - int rc; + int rc, id; if ((rc = mon_text_init()) != 0) goto err_text; @@ -366,9 +366,8 @@ static int __init mon_init(void) // MOD_INC_USE_COUNT(which_module?); mutex_lock(&usb_bus_list_lock); - list_for_each_entry (ubus, &usb_bus_list, bus_list) { + idr_for_each_entry(&usb_bus_idr, ubus, id) mon_bus_init(ubus); - } usb_register_notify(&mon_nb); mutex_unlock(&usb_bus_list_lock); return 0; |