USB: core: remove polling for /sys/kernel/debug/usb/devices

The latest reference to usbfs_conn_disc_event() removed in
commit fb28d58b72aa ("USB: remove CONFIG_USB_DEVICEFS")
in 2012 and now a user poll() waits infinitely for content changes.

Signed-off-by: Sergey Korolev <s.korolev@ndmsystems.com>
Link: https://lore.kernel.org/r/20200809161233.13135-1-s.korolev@ndmsystems.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c
index 696b2b6..1ef2de6 100644 (file)
--- 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,
 };

diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 98e7d1e..c893f54 100644 (file)
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -191,7 +191,6 @@ extern const struct attribute_group *usb_interface_groups[];
 extern struct usb_driver usbfs_driver;
 extern const struct file_operations usbfs_devices_fops;
 extern const struct file_operations usbdev_file_operations;
-extern void usbfs_conn_disc_event(void);
 
 extern int usb_devio_init(void);
 extern void usb_devio_cleanup(void);