diff options
Diffstat (limited to 'drivers/usb/core/devices.c')
| -rw-r--r-- | drivers/usb/core/devices.c | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c index 696b2b692b83..1ef2de6e375a 100644 --- a/drivers/usb/core/devices.c +++ b/drivers/usb/core/devices.c @@ -39,7 +39,6 @@ #include <linux/fs.h> #include <linux/mm.h> #include <linux/gfp.h> -#include <linux/poll.h> #include <linux/usb.h> #include <linux/usbdevice_fs.h> #include <linux/usb/hcd.h> @@ -97,22 +96,6 @@ 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"; -/* - * Wait for an connect/disconnect event to happen. We initialize - * the event counter with an odd number, and each event will increment - * the event counter by two, so it will always _stay_ odd. That means - * that it will never be zero, so "event 0" will never match a current - * event, and thus 'poll' will always trigger as readable for the first - * time it gets called. - */ -static struct device_connect_event { - atomic_t count; - wait_queue_head_t wait; -} device_event = { - .count = ATOMIC_INIT(1), - .wait = __WAIT_QUEUE_HEAD_INITIALIZER(device_event.wait) -}; - struct class_info { int class; char *class_name; @@ -146,12 +129,6 @@ static const struct class_info clas_info[] = { /*****************************************************************/ -void usbfs_conn_disc_event(void) -{ - atomic_add(2, &device_event.count); - wake_up(&device_event.wait); -} - static const char *class_decode(const int class) { int ix; @@ -623,25 +600,7 @@ static ssize_t usb_device_read(struct file *file, char __user *buf, return total_written; } -/* Kernel lock for "lastev" protection */ -static __poll_t usb_device_poll(struct file *file, - struct poll_table_struct *wait) -{ - unsigned int event_count; - - poll_wait(file, &device_event.wait, wait); - - event_count = atomic_read(&device_event.count); - if (file->f_version != event_count) { - file->f_version = event_count; - return EPOLLIN | EPOLLRDNORM; - } - - return 0; -} - const struct file_operations usbfs_devices_fops = { .llseek = no_seek_end_llseek, .read = usb_device_read, - .poll = usb_device_poll, }; |