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During stress test with maximum VAPs and peer connected, below warning is seen: [ 1079.110967] ath12k_pci 0004:01:00.0: mgmt tx queue is full [ 1079.117708] ath12k_pci 0004:01:00.0: failed to queue management frame -28 [ 1079.123191] ath12k_pci 0004:01:00.0: mgmt tx queue is full [ 1079.129960] ath12k_pci 0004:01:00.0: failed to queue management frame -28 [ 1079.135641] ath12k_pci 0004:01:00.0: mgmt tx queue is full This is caused by potential race condition while accessing skb_queue_len(). When ath12k_mgmt_over_wmi_tx_work() and ath12k_mac_mgmt_tx() is called concurrently, then skb_queue_len() might fetch list length which is modified by skb_queue_tail() or skb_dequeue(). Replace skb_queue_len() with skb_queue_len_lockless() which will prevent concurrent modified access using READ_ONCE(). And also use '>=', in case we queue a few SKBs simultaneously. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 Signed-off-by: Karthik M <quic_karm@quicinc.com> Signed-off-by: Ramya Gnanasekar <quic_rgnanase@quicinc.com> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Link: https://lore.kernel.org/r/20230419095758.19998-1-quic_rgnanase@quicinc.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.