linux-kernel - [PATCH v1] HID: ft260: fix device removal due to USB disconnect

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Message-Id: <20210720144954.5392-1-michael.zaidman@gmail.com>
Date:   Tue, 20 Jul 2021 17:49:54 +0300
From:   Michael Zaidman <michael.zaidman@...il.com>
To:     jikos@...nel.org, benjamin.tissoires@...hat.com,
        aaron.jones@...ichip.com
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        linux-i2c@...r.kernel.org,
        Michael Zaidman <michael.zaidman@...il.com>
Subject: [PATCH v1] HID: ft260: fix device removal due to USB disconnect

This commit fixes a regression introduced by the commit 82f09a637dd3
("HID: ft260: improve error handling of ft260_hid_feature_report_get()")
when upon USB disconnect, the ft260 i2c device is still available within
the /dev folder.

Signed-off-by: Michael Zaidman <michael.zaidman@...il.com>
Acked-by: Aaron Jones (FTDI-UK) <aaron.jones@...ichip.com>
---
 drivers/hid/hid-ft260.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c
index f43a8406cb9a..fa73a35aaf98 100644
--- a/drivers/hid/hid-ft260.c
+++ b/drivers/hid/hid-ft260.c
@@ -742,8 +742,8 @@ static int ft260_is_interface_enabled(struct hid_device *hdev)
 	int ret;
 
 	ret = ft260_get_system_config(hdev, &cfg);
-	if (ret)
-		return ret;
+	if (ret < 0)
+		return 0;
 
 	ft260_dbg("interface:  0x%02x\n", interface);
 	ft260_dbg("chip mode:  0x%02x\n", cfg.chip_mode);
@@ -754,23 +754,16 @@ static int ft260_is_interface_enabled(struct hid_device *hdev)
 	switch (cfg.chip_mode) {
 	case FT260_MODE_ALL:
 	case FT260_MODE_BOTH:
-		if (interface == 1) {
+		if (interface == 1)
 			hid_info(hdev, "uart interface is not supported\n");
-			return 0;
-		}
-		ret = 1;
+		else
+			ret = 1;
 		break;
 	case FT260_MODE_UART:
-		if (interface == 0) {
-			hid_info(hdev, "uart is unsupported on interface 0\n");
-			ret = 0;
-		}
+		hid_info(hdev, "uart interface is not supported\n");
 		break;
 	case FT260_MODE_I2C:
-		if (interface == 1) {
-			hid_info(hdev, "i2c is unsupported on interface 1\n");
-			ret = 0;
-		}
+		ret = 1;
 		break;
 	}
 	return ret;
@@ -1004,11 +997,9 @@ static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 static void ft260_remove(struct hid_device *hdev)
 {
-	int ret;
 	struct ft260_device *dev = hid_get_drvdata(hdev);
 
-	ret = ft260_is_interface_enabled(hdev);
-	if (ret <= 0)
+	if (!dev)
 		return;
 
 	sysfs_remove_group(&hdev->dev.kobj, &ft260_attr_group);
-- 
2.25.1