Patch "Bluetooth: btnxpuart: Handle FW Download Abort scenario" has been added to the 6.10-stable tree

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This is a note to let you know that I've just added the patch titled

    Bluetooth: btnxpuart: Handle FW Download Abort scenario

to the 6.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bluetooth-btnxpuart-handle-fw-download-abort-scenari.patch
and it can be found in the queue-6.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a907b35bcc1d6505e4a8418e3850e27091d12b9d
Author: Neeraj Sanjay Kale <neeraj.sanjaykale@xxxxxxx>
Date:   Wed May 15 12:36:57 2024 +0530

    Bluetooth: btnxpuart: Handle FW Download Abort scenario
    
    [ Upstream commit e3c4891098c875a63ab0c3b31d584f6d4f1895fd ]
    
    This adds a new flag BTNXPUART_FW_DOWNLOAD_ABORT which handles the
    situation where driver is removed while firmware download is in
    progress.
    
    logs:
    modprobe btnxpuart
    [65239.230431] Bluetooth: hci0: ChipID: 7601, Version: 0
    [65239.236670] Bluetooth: hci0: Request Firmware: nxp/uartspi_n61x_v1.bin.se
    rmmod btnxpuart
    [65241.425300] Bluetooth: hci0: FW Download Aborted
    
    Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@xxxxxxx>
    Tested-by: Guillaume Legoupil <guillaume.legoupil@xxxxxxx>
    Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
    Stable-dep-of: 35237475384a ("Bluetooth: btnxpuart: Fix random crash seen while removing driver")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index d310b525fbf00..1bb97747c4836 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -29,6 +29,7 @@
 #define BTNXPUART_CHECK_BOOT_SIGNATURE	3
 #define BTNXPUART_SERDEV_OPEN		4
 #define BTNXPUART_IR_IN_PROGRESS	5
+#define BTNXPUART_FW_DOWNLOAD_ABORT	6
 
 /* NXP HW err codes */
 #define BTNXPUART_IR_HW_ERR		0xb0
@@ -159,6 +160,7 @@ struct btnxpuart_dev {
 	u8 fw_name[MAX_FW_FILE_NAME_LEN];
 	u32 fw_dnld_v1_offset;
 	u32 fw_v1_sent_bytes;
+	u32 fw_dnld_v3_offset;
 	u32 fw_v3_offset_correction;
 	u32 fw_v1_expected_len;
 	u32 boot_reg_offset;
@@ -566,6 +568,7 @@ static int nxp_download_firmware(struct hci_dev *hdev)
 	nxpdev->fw_v1_sent_bytes = 0;
 	nxpdev->fw_v1_expected_len = HDR_LEN;
 	nxpdev->boot_reg_offset = 0;
+	nxpdev->fw_dnld_v3_offset = 0;
 	nxpdev->fw_v3_offset_correction = 0;
 	nxpdev->baudrate_changed = false;
 	nxpdev->timeout_changed = false;
@@ -580,14 +583,23 @@ static int nxp_download_firmware(struct hci_dev *hdev)
 					       !test_bit(BTNXPUART_FW_DOWNLOADING,
 							 &nxpdev->tx_state),
 					       msecs_to_jiffies(60000));
+
+	release_firmware(nxpdev->fw);
+	memset(nxpdev->fw_name, 0, sizeof(nxpdev->fw_name));
+
 	if (err == 0) {
-		bt_dev_err(hdev, "FW Download Timeout.");
+		bt_dev_err(hdev, "FW Download Timeout. offset: %d",
+				nxpdev->fw_dnld_v1_offset ?
+				nxpdev->fw_dnld_v1_offset :
+				nxpdev->fw_dnld_v3_offset);
 		return -ETIMEDOUT;
 	}
+	if (test_bit(BTNXPUART_FW_DOWNLOAD_ABORT, &nxpdev->tx_state)) {
+		bt_dev_err(hdev, "FW Download Aborted");
+		return -EINTR;
+	}
 
 	serdev_device_set_flow_control(nxpdev->serdev, true);
-	release_firmware(nxpdev->fw);
-	memset(nxpdev->fw_name, 0, sizeof(nxpdev->fw_name));
 
 	/* Allow the downloaded FW to initialize */
 	msleep(1200);
@@ -998,8 +1010,9 @@ static int nxp_recv_fw_req_v3(struct hci_dev *hdev, struct sk_buff *skb)
 		goto free_skb;
 	}
 
-	serdev_device_write_buf(nxpdev->serdev, nxpdev->fw->data + offset -
-				nxpdev->fw_v3_offset_correction, len);
+	nxpdev->fw_dnld_v3_offset = offset - nxpdev->fw_v3_offset_correction;
+	serdev_device_write_buf(nxpdev->serdev, nxpdev->fw->data +
+				nxpdev->fw_dnld_v3_offset, len);
 
 free_skb:
 	kfree_skb(skb);
@@ -1429,16 +1442,22 @@ static void nxp_serdev_remove(struct serdev_device *serdev)
 	struct btnxpuart_dev *nxpdev = serdev_device_get_drvdata(serdev);
 	struct hci_dev *hdev = nxpdev->hdev;
 
-	/* Restore FW baudrate to fw_init_baudrate if changed.
-	 * This will ensure FW baudrate is in sync with
-	 * driver baudrate in case this driver is re-inserted.
-	 */
-	if (nxpdev->current_baudrate != nxpdev->fw_init_baudrate) {
-		nxpdev->new_baudrate = nxpdev->fw_init_baudrate;
-		nxp_set_baudrate_cmd(hdev, NULL);
+	if (is_fw_downloading(nxpdev)) {
+		set_bit(BTNXPUART_FW_DOWNLOAD_ABORT, &nxpdev->tx_state);
+		clear_bit(BTNXPUART_FW_DOWNLOADING, &nxpdev->tx_state);
+		wake_up_interruptible(&nxpdev->check_boot_sign_wait_q);
+		wake_up_interruptible(&nxpdev->fw_dnld_done_wait_q);
+	} else {
+		/* Restore FW baudrate to fw_init_baudrate if changed.
+		 * This will ensure FW baudrate is in sync with
+		 * driver baudrate in case this driver is re-inserted.
+		 */
+		if (nxpdev->current_baudrate != nxpdev->fw_init_baudrate) {
+			nxpdev->new_baudrate = nxpdev->fw_init_baudrate;
+			nxp_set_baudrate_cmd(hdev, NULL);
+		}
+		ps_cancel_timer(nxpdev);
 	}
-
-	ps_cancel_timer(nxpdev);
 	hci_unregister_dev(hdev);
 	hci_free_dev(hdev);
 }




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