The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.14.y git checkout FETCH_HEAD git cherry-pick -x 47c5d829a3e326b7395352a10fc8a6effe7afa15 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023061125-doodle-same-5a50@gregkh' --subject-prefix 'PATCH 4.14.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 47c5d829a3e326b7395352a10fc8a6effe7afa15 Mon Sep 17 00:00:00 2001 From: Johan Hovold johan+linaro@kernel.org Date: Wed, 31 May 2023 10:57:59 +0200 Subject: [PATCH] Bluetooth: hci_qca: fix debugfs registration

Since commit 3e4be65eb82c ("Bluetooth: hci_qca: Add poweroff support during hci down for wcn3990"), the setup callback which registers the debugfs interface can be called multiple times.

This specifically leads to the following error when powering on the controller:

debugfs: Directory 'ibs' with parent 'hci0' already present!

Add a driver flag to avoid trying to register the debugfs interface more than once.

Fixes: 3e4be65eb82c ("Bluetooth: hci_qca: Add poweroff support during hci down for wcn3990") Cc: stable@vger.kernel.org # 4.20 Signed-off-by: Johan Hovold johan+linaro@kernel.org Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index 1b064504b388..e30c979535b1 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -78,7 +78,8 @@ enum qca_flags { QCA_HW_ERROR_EVENT, QCA_SSR_TRIGGERED, QCA_BT_OFF, - QCA_ROM_FW + QCA_ROM_FW, + QCA_DEBUGFS_CREATED, };

enum qca_capabilities { @@ -635,6 +636,9 @@ static void qca_debugfs_init(struct hci_dev *hdev) if (!hdev->debugfs) return;

+ if (test_and_set_bit(QCA_DEBUGFS_CREATED, &qca->flags)) + return; + ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);

/* read only */