1 files changed, 69 insertions, 85 deletions

diff --git a/drivers/input/misc/ati_remote2.c b/drivers/input/misc/ati_remote2.c
index f63341f20b91..e84649af801d 100644
--- a/drivers/input/misc/ati_remote2.c
+++ b/drivers/input/misc/ati_remote2.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * ati_remote2 - ATI/Philips USB RF remote driver
  *
  * Copyright (C) 2005-2008 Ville Syrjala <syrjala@sci.fi>
  * Copyright (C) 2007-2008 Peter Stokes <linux@dadeos.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
  */
 
 #include <linux/usb/input.h>
@@ -14,17 +11,15 @@
 #include <linux/module.h>
 
 #define DRIVER_DESC    "ATI/Philips USB RF remote driver"
-#define DRIVER_VERSION "0.3"
 
 MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_VERSION(DRIVER_VERSION);
 MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
 MODULE_LICENSE("GPL");
 
 /*
  * ATI Remote Wonder II Channel Configuration
  *
- * The remote control can by assigned one of sixteen "channels" in order to facilitate
+ * The remote control can be assigned one of sixteen "channels" in order to facilitate
  * the use of multiple remote controls within range of each other.
  * A remote's "channel" may be altered by pressing and holding the "PC" button for
  * approximately 3 seconds, after which the button will slowly flash the count of the
@@ -73,7 +68,7 @@ static int ati_remote2_get_channel_mask(char *buffer,
 {
 	pr_debug("%s()\n", __func__);
 
-	return sprintf(buffer, "0x%04x", *(unsigned int *)kp->arg);
+	return sprintf(buffer, "0x%04x\n", *(unsigned int *)kp->arg);
 }
 
 static int ati_remote2_set_mode_mask(const char *val,
@@ -89,12 +84,12 @@ static int ati_remote2_get_mode_mask(char *buffer,
 {
 	pr_debug("%s()\n", __func__);
 
-	return sprintf(buffer, "0x%02x", *(unsigned int *)kp->arg);
+	return sprintf(buffer, "0x%02x\n", *(unsigned int *)kp->arg);
 }
 
 static unsigned int channel_mask = ATI_REMOTE2_MAX_CHANNEL_MASK;
 #define param_check_channel_mask(name, p) __param_check(name, p, unsigned int)
-static struct kernel_param_ops param_ops_channel_mask = {
+static const struct kernel_param_ops param_ops_channel_mask = {
 	.set = ati_remote2_set_channel_mask,
 	.get = ati_remote2_get_channel_mask,
 };
@@ -103,14 +98,14 @@ MODULE_PARM_DESC(channel_mask, "Bitmask of channels to accept <15:Channel16>...<
 
 static unsigned int mode_mask = ATI_REMOTE2_MAX_MODE_MASK;
 #define param_check_mode_mask(name, p) __param_check(name, p, unsigned int)
-static struct kernel_param_ops param_ops_mode_mask = {
+static const struct kernel_param_ops param_ops_mode_mask = {
 	.set = ati_remote2_set_mode_mask,
 	.get = ati_remote2_get_mode_mask,
 };
 module_param(mode_mask, mode_mask, 0644);
 MODULE_PARM_DESC(mode_mask, "Bitmask of modes to accept <4:PC><3:AUX4><2:AUX3><1:AUX2><0:AUX1>");
 
-static struct usb_device_id ati_remote2_id_table[] = {
+static const struct usb_device_id ati_remote2_id_table[] = {
 	{ USB_DEVICE(0x0471, 0x0602) },	/* ATI Remote Wonder II */
 	{ }
 };
@@ -209,26 +204,7 @@ struct ati_remote2 {
 	unsigned int mode_mask;
 };
 
-static int ati_remote2_probe(struct usb_interface *interface, const struct usb_device_id *id);
-static void ati_remote2_disconnect(struct usb_interface *interface);
-static int ati_remote2_suspend(struct usb_interface *interface, pm_message_t message);
-static int ati_remote2_resume(struct usb_interface *interface);
-static int ati_remote2_reset_resume(struct usb_interface *interface);
-static int ati_remote2_pre_reset(struct usb_interface *interface);
-static int ati_remote2_post_reset(struct usb_interface *interface);
-
-static struct usb_driver ati_remote2_driver = {
-	.name       = "ati_remote2",
-	.probe      = ati_remote2_probe,
-	.disconnect = ati_remote2_disconnect,
-	.id_table   = ati_remote2_id_table,
-	.suspend    = ati_remote2_suspend,
-	.resume     = ati_remote2_resume,
-	.reset_resume = ati_remote2_reset_resume,
-	.pre_reset  = ati_remote2_pre_reset,
-	.post_reset = ati_remote2_post_reset,
-	.supports_autosuspend = 1,
-};
+static struct usb_driver ati_remote2_driver;
 
 static int ati_remote2_submit_urbs(struct ati_remote2 *ar2)
 {
@@ -268,29 +244,21 @@ static int ati_remote2_open(struct input_dev *idev)
 	if (r) {
 		dev_err(&ar2->intf[0]->dev,
 			"%s(): usb_autopm_get_interface() = %d\n", __func__, r);
-		goto fail1;
+		return r;
 	}
 
-	mutex_lock(&ati_remote2_mutex);
+	scoped_guard(mutex, &ati_remote2_mutex) {
+		if (!(ar2->flags & ATI_REMOTE2_SUSPENDED)) {
+			r = ati_remote2_submit_urbs(ar2);
+			if (r)
+				break;
+		}
 
-	if (!(ar2->flags & ATI_REMOTE2_SUSPENDED)) {
-		r = ati_remote2_submit_urbs(ar2);
-		if (r)
-			goto fail2;
+		ar2->flags |= ATI_REMOTE2_OPENED;
 	}
 
-	ar2->flags |= ATI_REMOTE2_OPENED;
-
-	mutex_unlock(&ati_remote2_mutex);
-
 	usb_autopm_put_interface(ar2->intf[0]);
 
-	return 0;
-
- fail2:
-	mutex_unlock(&ati_remote2_mutex);
-	usb_autopm_put_interface(ar2->intf[0]);
- fail1:
 	return r;
 }
 
@@ -300,14 +268,12 @@ static void ati_remote2_close(struct input_dev *idev)
 
 	dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
 
-	mutex_lock(&ati_remote2_mutex);
+	guard(mutex)(&ati_remote2_mutex);
 
 	if (!(ar2->flags & ATI_REMOTE2_SUSPENDED))
 		ati_remote2_kill_urbs(ar2);
 
 	ar2->flags &= ~ATI_REMOTE2_OPENED;
-
-	mutex_unlock(&ati_remote2_mutex);
 }
 
 static void ati_remote2_input_mouse(struct ati_remote2 *ar2)
@@ -644,7 +610,7 @@ static int ati_remote2_urb_init(struct ati_remote2 *ar2)
 			return -ENOMEM;
 
 		pipe = usb_rcvintpipe(udev, ar2->ep[i]->bEndpointAddress);
-		maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
+		maxp = usb_maxpacket(udev, pipe);
 		maxp = maxp > 4 ? 4 : maxp;
 
 		usb_fill_int_urb(ar2->urb[i], udev, pipe, ar2->buf[i], maxp,
@@ -737,16 +703,14 @@ static ssize_t ati_remote2_store_channel_mask(struct device *dev,
 		return r;
 	}
 
-	mutex_lock(&ati_remote2_mutex);
-
-	if (mask != ar2->channel_mask) {
-		r = ati_remote2_setup(ar2, mask);
-		if (!r)
-			ar2->channel_mask = mask;
+	scoped_guard(mutex, &ati_remote2_mutex) {
+		if (mask != ar2->channel_mask) {
+			r = ati_remote2_setup(ar2, mask);
+			if (!r)
+				ar2->channel_mask = mask;
+		}
 	}
 
-	mutex_unlock(&ati_remote2_mutex);
-
 	usb_autopm_put_interface(ar2->intf[0]);
 
 	return r ? r : count;
@@ -796,10 +760,7 @@ static struct attribute *ati_remote2_attrs[] = {
 	&dev_attr_mode_mask.attr,
 	NULL,
 };
-
-static struct attribute_group ati_remote2_attr_group = {
-	.attrs = ati_remote2_attrs,
-};
+ATTRIBUTE_GROUPS(ati_remote2);
 
 static int ati_remote2_probe(struct usb_interface *interface, const struct usb_device_id *id)
 {
@@ -817,36 +778,55 @@ static int ati_remote2_probe(struct usb_interface *interface, const struct usb_d
 
 	ar2->udev = udev;
 
+	/* Sanity check, first interface must have an endpoint */
+	if (alt->desc.bNumEndpoints < 1 || !alt->endpoint) {
+		dev_err(&interface->dev,
+			"%s(): interface 0 must have an endpoint\n", __func__);
+		r = -ENODEV;
+		goto fail1;
+	}
 	ar2->intf[0] = interface;
 	ar2->ep[0] = &alt->endpoint[0].desc;
 
+	/* Sanity check, the device must have two interfaces */
 	ar2->intf[1] = usb_ifnum_to_if(udev, 1);
+	if ((udev->actconfig->desc.bNumInterfaces < 2) || !ar2->intf[1]) {
+		dev_err(&interface->dev, "%s(): need 2 interfaces, found %d\n",
+			__func__, udev->actconfig->desc.bNumInterfaces);
+		r = -ENODEV;
+		goto fail1;
+	}
+
 	r = usb_driver_claim_interface(&ati_remote2_driver, ar2->intf[1], ar2);
 	if (r)
 		goto fail1;
+
+	/* Sanity check, second interface must have an endpoint */
 	alt = ar2->intf[1]->cur_altsetting;
+	if (alt->desc.bNumEndpoints < 1 || !alt->endpoint) {
+		dev_err(&interface->dev,
+			"%s(): interface 1 must have an endpoint\n", __func__);
+		r = -ENODEV;
+		goto fail2;
+	}
 	ar2->ep[1] = &alt->endpoint[0].desc;
 
 	r = ati_remote2_urb_init(ar2);
 	if (r)
-		goto fail2;
+		goto fail3;
 
 	ar2->channel_mask = channel_mask;
 	ar2->mode_mask = mode_mask;
 
 	r = ati_remote2_setup(ar2, ar2->channel_mask);
 	if (r)
-		goto fail2;
+		goto fail3;
 
 	usb_make_path(udev, ar2->phys, sizeof(ar2->phys));
 	strlcat(ar2->phys, "/input0", sizeof(ar2->phys));
 
 	strlcat(ar2->name, "ATI Remote Wonder II", sizeof(ar2->name));
 
-	r = sysfs_create_group(&udev->dev.kobj, &ati_remote2_attr_group);
-	if (r)
-		goto fail2;
-
 	r = ati_remote2_input_init(ar2);
 	if (r)
 		goto fail3;
@@ -858,9 +838,8 @@ static int ati_remote2_probe(struct usb_interface *interface, const struct usb_d
 	return 0;
 
  fail3:
-	sysfs_remove_group(&udev->dev.kobj, &ati_remote2_attr_group);
- fail2:
 	ati_remote2_urb_cleanup(ar2);
+ fail2:
 	usb_driver_release_interface(&ati_remote2_driver, ar2->intf[1]);
  fail1:
 	kfree(ar2);
@@ -881,8 +860,6 @@ static void ati_remote2_disconnect(struct usb_interface *interface)
 
 	input_unregister_device(ar2->idev);
 
-	sysfs_remove_group(&ar2->udev->dev.kobj, &ati_remote2_attr_group);
-
 	ati_remote2_urb_cleanup(ar2);
 
 	usb_driver_release_interface(&ati_remote2_driver, ar2->intf[1]);
@@ -903,15 +880,13 @@ static int ati_remote2_suspend(struct usb_interface *interface,
 
 	dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
 
-	mutex_lock(&ati_remote2_mutex);
+	guard(mutex)(&ati_remote2_mutex);
 
 	if (ar2->flags & ATI_REMOTE2_OPENED)
 		ati_remote2_kill_urbs(ar2);
 
 	ar2->flags |= ATI_REMOTE2_SUSPENDED;
 
-	mutex_unlock(&ati_remote2_mutex);
-
 	return 0;
 }
 
@@ -928,7 +903,7 @@ static int ati_remote2_resume(struct usb_interface *interface)
 
 	dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
 
-	mutex_lock(&ati_remote2_mutex);
+	guard(mutex)(&ati_remote2_mutex);
 
 	if (ar2->flags & ATI_REMOTE2_OPENED)
 		r = ati_remote2_submit_urbs(ar2);
@@ -936,8 +911,6 @@ static int ati_remote2_resume(struct usb_interface *interface)
 	if (!r)
 		ar2->flags &= ~ATI_REMOTE2_SUSPENDED;
 
-	mutex_unlock(&ati_remote2_mutex);
-
 	return r;
 }
 
@@ -954,11 +927,11 @@ static int ati_remote2_reset_resume(struct usb_interface *interface)
 
 	dev_dbg(&ar2->intf[0]->dev, "%s()\n", __func__);
 
-	mutex_lock(&ati_remote2_mutex);
+	guard(mutex)(&ati_remote2_mutex);
 
 	r = ati_remote2_setup(ar2, ar2->channel_mask);
 	if (r)
-		goto out;
+		return r;
 
 	if (ar2->flags & ATI_REMOTE2_OPENED)
 		r = ati_remote2_submit_urbs(ar2);
@@ -966,9 +939,6 @@ static int ati_remote2_reset_resume(struct usb_interface *interface)
 	if (!r)
 		ar2->flags &= ~ATI_REMOTE2_SUSPENDED;
 
- out:
-	mutex_unlock(&ati_remote2_mutex);
-
 	return r;
 }
 
@@ -1013,4 +983,18 @@ static int ati_remote2_post_reset(struct usb_interface *interface)
 	return r;
 }
 
+static struct usb_driver ati_remote2_driver = {
+	.name       = "ati_remote2",
+	.probe      = ati_remote2_probe,
+	.disconnect = ati_remote2_disconnect,
+	.dev_groups = ati_remote2_groups,
+	.id_table   = ati_remote2_id_table,
+	.suspend    = ati_remote2_suspend,
+	.resume     = ati_remote2_resume,
+	.reset_resume = ati_remote2_reset_resume,
+	.pre_reset  = ati_remote2_pre_reset,
+	.post_reset = ati_remote2_post_reset,
+	.supports_autosuspend = 1,
+};
+
 module_usb_driver(ati_remote2_driver);