linux-kernel - [PATCH 4/4] Revert "Bluetooth: btusb: add sysfs attribute to control USB alt setting"

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Message-ID: <20250411133330.171563-4-chharry@google.com>
Date: Fri, 11 Apr 2025 21:33:08 +0800
From: Hsin-chen Chuang <chharry@...gle.com>
To: luiz.dentz@...il.com
Cc: Hsin-chen Chuang <chharry@...omium.org>, chromeos-bluetooth-upstreaming@...omium.org, 
	Marcel Holtmann <marcel@...tmann.org>, linux-bluetooth@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] Revert "Bluetooth: btusb: add sysfs attribute to control
 USB alt setting"

From: Hsin-chen Chuang <chharry@...omium.org>

This reverts commit b16b327edb4d030fb4c8fe38c7d299074d47ee3f.

The sysfs node introduced by this patch could potentially race with user
space. The original motivation - Support configuring altsetting from the
user space will be added by another series.

Cc: chromeos-bluetooth-upstreaming@...omium.org
Signed-off-by: Hsin-chen Chuang <chharry@...omium.org>
---

 drivers/bluetooth/btusb.c | 34 +---------------------------------
 1 file changed, 1 insertion(+), 33 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index b7040747b890..304ec6f830f1 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3688,32 +3688,6 @@ static const struct file_operations force_poll_sync_fops = {
 	.llseek		= default_llseek,
 };
 
-static ssize_t isoc_alt_show(struct device *dev,
-			     struct device_attribute *attr,
-			     char *buf)
-{
-	struct btusb_data *data = dev_get_drvdata(dev);
-
-	return sysfs_emit(buf, "%d\n", data->isoc_altsetting);
-}
-
-static ssize_t isoc_alt_store(struct device *dev,
-			      struct device_attribute *attr,
-			      const char *buf, size_t count)
-{
-	struct btusb_data *data = dev_get_drvdata(dev);
-	int alt;
-	int ret;
-
-	if (kstrtoint(buf, 10, &alt))
-		return -EINVAL;
-
-	ret = btusb_switch_alt_setting(data->hdev, alt);
-	return ret < 0 ? ret : count;
-}
-
-static DEVICE_ATTR_RW(isoc_alt);
-
 #define BTUSB_HCI_DRV_OP_SUPPORTED_ALTSETTINGS   HCI_DRV_OP_DRIVER_SPECIFIC_BASE
 #define BTUSB_HCI_DRV_SUPPORTED_ALTSETTINGS_SIZE 0
 struct btusb_hci_drv_rp_supported_altsettings {
@@ -4197,10 +4171,6 @@ static int btusb_probe(struct usb_interface *intf,
 						 data->isoc, data);
 		if (err < 0)
 			goto out_free_dev;
-
-		err = device_create_file(&intf->dev, &dev_attr_isoc_alt);
-		if (err)
-			goto out_free_dev;
 	}
 
 	if (IS_ENABLED(CONFIG_BT_HCIBTUSB_BCM) && data->diag) {
@@ -4247,10 +4217,8 @@ static void btusb_disconnect(struct usb_interface *intf)
 	hdev = data->hdev;
 	usb_set_intfdata(data->intf, NULL);
 
-	if (data->isoc) {
-		device_remove_file(&intf->dev, &dev_attr_isoc_alt);
+	if (data->isoc)
 		usb_set_intfdata(data->isoc, NULL);
-	}
 
 	if (data->diag)
 		usb_set_intfdata(data->diag, NULL);
-- 
2.49.0.604.gff1f9ca942-goog