3.18-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 09c8b00ae3e16c8d0fd4beb2ca064502a76c0f17 ]
Handle the "a new device is present" message properly by dynamically creating the input device at this point in time. This means we now do not "preallocate" all 4 devices when a single wireless base station is seen. This requires a workqueue as we are in interrupt context when we learn about this.
Also properly disconnect any devices that we are told are removed.
Signed-off-by: "Pierre-Loup A. Griffais" pgriffais@valvesoftware.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Pavel Rojtberg rojtberg@gmail.com Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/input/joystick/xpad.c | 107 ++++++++++++++++++++++------------ 1 file changed, 69 insertions(+), 38 deletions(-)
diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c index 33c3071c56f9..15477de1608d 100644 --- a/drivers/input/joystick/xpad.c +++ b/drivers/input/joystick/xpad.c @@ -76,6 +76,8 @@ */
#include <linux/kernel.h> +#include <linux/input.h> +#include <linux/rcupdate.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/module.h> @@ -321,10 +323,12 @@ MODULE_DEVICE_TABLE(usb, xpad_table);
struct usb_xpad { struct input_dev *dev; /* input device interface */ + struct input_dev __rcu *x360w_dev; struct usb_device *udev; /* usb device */ struct usb_interface *intf; /* usb interface */
- int pad_present; + bool pad_present; + bool input_created;
struct urb *irq_in; /* urb for interrupt in report */ unsigned char *idata; /* input data */ @@ -345,8 +349,12 @@ struct usb_xpad { int xtype; /* type of xbox device */ int pad_nr; /* the order x360 pads were attached */ const char *name; /* name of the device */ + struct work_struct work; /* init/remove device from callback */ };
+static int xpad_init_input(struct usb_xpad *xpad); +static void xpad_deinit_input(struct usb_xpad *xpad); + /* * xpad_process_packet * @@ -426,11 +434,9 @@ static void xpad_process_packet(struct usb_xpad *xpad, u16 cmd, unsigned char *d * http://www.free60.org/wiki/Gamepad */
-static void xpad360_process_packet(struct usb_xpad *xpad, +static void xpad360_process_packet(struct usb_xpad *xpad, struct input_dev *dev, u16 cmd, unsigned char *data) { - struct input_dev *dev = xpad->dev; - /* digital pad */ if (xpad->mapping & MAP_DPAD_TO_BUTTONS) { /* dpad as buttons (left, right, up, down) */ @@ -497,7 +503,30 @@ static void xpad360_process_packet(struct usb_xpad *xpad, input_sync(dev); }
-static void xpad_identify_controller(struct usb_xpad *xpad); +static void xpad_presence_work(struct work_struct *work) +{ + struct usb_xpad *xpad = container_of(work, struct usb_xpad, work); + int error; + + if (xpad->pad_present) { + error = xpad_init_input(xpad); + if (error) { + /* complain only, not much else we can do here */ + dev_err(&xpad->dev->dev, + "unable to init device: %d\n", error); + } else { + rcu_assign_pointer(xpad->x360w_dev, xpad->dev); + } + } else { + RCU_INIT_POINTER(xpad->x360w_dev, NULL); + synchronize_rcu(); + /* + * Now that we are sure xpad360w_process_packet is not + * using input device we can get rid of it. + */ + xpad_deinit_input(xpad); + } +}
/* * xpad360w_process_packet @@ -515,24 +544,28 @@ static void xpad_identify_controller(struct usb_xpad *xpad); */ static void xpad360w_process_packet(struct usb_xpad *xpad, u16 cmd, unsigned char *data) { + struct input_dev *dev; + bool present; + /* Presence change */ if (data[0] & 0x08) { - if (data[1] & 0x80) { - xpad->pad_present = 1; - /* - * Light up the segment corresponding to - * controller number. - */ - xpad_identify_controller(xpad); - } else - xpad->pad_present = 0; + present = (data[1] & 0x80) != 0; + + if (xpad->pad_present != present) { + xpad->pad_present = present; + schedule_work(&xpad->work); + } }
/* Valid pad data */ if (data[1] != 0x1) return;
- xpad360_process_packet(xpad, cmd, &data[4]); + rcu_read_lock(); + dev = rcu_dereference(xpad->x360w_dev); + if (dev) + xpad360_process_packet(xpad, dev, cmd, &data[4]); + rcu_read_unlock(); }
/* @@ -661,7 +694,7 @@ static void xpad_irq_in(struct urb *urb)
switch (xpad->xtype) { case XTYPE_XBOX360: - xpad360_process_packet(xpad, 0, xpad->idata); + xpad360_process_packet(xpad, xpad->dev, 0, xpad->idata); break; case XTYPE_XBOX360W: xpad360w_process_packet(xpad, 0, xpad->idata); @@ -1003,14 +1036,7 @@ static int xpad_led_probe(struct usb_xpad *xpad) if (error) goto err_free_id;
- if (xpad->xtype == XTYPE_XBOX360) { - /* - * Light up the segment corresponding to controller - * number on wired devices. On wireless we'll do that - * when they respond to "presence" packet. - */ - xpad_identify_controller(xpad); - } + xpad_identify_controller(xpad);
return 0;
@@ -1099,8 +1125,11 @@ static void xpad_set_up_abs(struct input_dev *input_dev, signed short abs)
static void xpad_deinit_input(struct usb_xpad *xpad) { - xpad_led_disconnect(xpad); - input_unregister_device(xpad->dev); + if (xpad->input_created) { + xpad->input_created = false; + xpad_led_disconnect(xpad); + input_unregister_device(xpad->dev); + } }
static int xpad_init_input(struct usb_xpad *xpad) @@ -1183,6 +1212,7 @@ static int xpad_init_input(struct usb_xpad *xpad) if (error) goto err_disconnect_led;
+ xpad->input_created = true; return 0;
err_disconnect_led: @@ -1246,6 +1276,7 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id xpad->mapping = xpad_device[i].mapping; xpad->xtype = xpad_device[i].xtype; xpad->name = xpad_device[i].name; + INIT_WORK(&xpad->work, xpad_presence_work);
if (xpad->xtype == XTYPE_UNKNOWN) { if (intf->cur_altsetting->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC) { @@ -1282,10 +1313,6 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id
usb_set_intfdata(intf, xpad);
- error = xpad_init_input(xpad); - if (error) - goto err_deinit_output; - if (xpad->xtype == XTYPE_XBOX360W) { /* * Submit the int URB immediately rather than waiting for open @@ -1297,7 +1324,7 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id xpad->irq_in->dev = xpad->udev; error = usb_submit_urb(xpad->irq_in, GFP_KERNEL); if (error) - goto err_deinit_input; + goto err_deinit_output;
/* * Send presence packet. @@ -1309,13 +1336,15 @@ static int xpad_probe(struct usb_interface *intf, const struct usb_device_id *id error = xpad_inquiry_pad_presence(xpad); if (error) goto err_kill_in_urb; + } else { + error = xpad_init_input(xpad); + if (error) + goto err_deinit_output; } return 0;
err_kill_in_urb: usb_kill_urb(xpad->irq_in); -err_deinit_input: - xpad_deinit_input(xpad); err_deinit_output: xpad_deinit_output(xpad); err_free_in_urb: @@ -1332,17 +1361,19 @@ static void xpad_disconnect(struct usb_interface *intf) { struct usb_xpad *xpad = usb_get_intfdata (intf);
- xpad_deinit_input(xpad); - xpad_deinit_output(xpad); - - if (xpad->xtype == XTYPE_XBOX360W) { + if (xpad->xtype == XTYPE_XBOX360W) usb_kill_urb(xpad->irq_in); - } + + cancel_work_sync(&xpad->work); + + xpad_deinit_input(xpad);
usb_free_urb(xpad->irq_in); usb_free_coherent(xpad->udev, XPAD_PKT_LEN, xpad->idata, xpad->idata_dma);
+ xpad_deinit_output(xpad); + kfree(xpad);
usb_set_intfdata(intf, NULL);