linux-kernel - [PATCH v8 3/4] Bluetooth: btusb: Add btusb devcoredump support

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Message-ID: <20230323140942.v8.3.I8cd97c192e8268567b6f467ccd993ec71897318e@changeid>
Date:   Thu, 23 Mar 2023 14:10:17 -0700
From:   Manish Mandlik <mmandlik@...gle.com>
To:     marcel@...tmann.org, luiz.dentz@...il.com
Cc:     linux-bluetooth@...r.kernel.org,
        chromeos-bluetooth-upstreaming@...omium.org,
        Manish Mandlik <mmandlik@...gle.com>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v8 3/4] Bluetooth: btusb: Add btusb devcoredump support

This patch implements the btusb driver side .coredump() callback to
trigger a devcoredump via sysfs.

Signed-off-by: Manish Mandlik <mmandlik@...gle.com>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---

(no changes since v6)

Changes in v6:
- Remove dev->coredump_disabled check since the sysfs flag related
  change has been abandoned

Changes in v4:
- New patch in the series

 drivers/bluetooth/btusb.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 4ca91c033d2f..9c9f7bf1375a 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -4385,6 +4385,17 @@ static int btusb_resume(struct usb_interface *intf)
 }
 #endif
 
+#ifdef CONFIG_DEV_COREDUMP
+static void btusb_coredump(struct device *dev)
+{
+	struct btusb_data *data = dev_get_drvdata(dev);
+	struct hci_dev *hdev = data->hdev;
+
+	if (hdev->dump.coredump)
+		hdev->dump.coredump(hdev);
+}
+#endif
+
 static struct usb_driver btusb_driver = {
 	.name		= "btusb",
 	.probe		= btusb_probe,
@@ -4396,6 +4407,14 @@ static struct usb_driver btusb_driver = {
 	.id_table	= btusb_table,
 	.supports_autosuspend = 1,
 	.disable_hub_initiated_lpm = 1,
+
+#ifdef CONFIG_DEV_COREDUMP
+	.drvwrap = {
+		.driver = {
+			.coredump = btusb_coredump,
+		},
+	},
+#endif
 };
 
 module_usb_driver(btusb_driver);
-- 
2.40.0.348.gf938b09366-goog