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3bf2e57e7d
During stress test scenarios, when the REO command ring becomes full, the RX queue update command issued during peer deletion fails due to insufficient space. In response, the host performs a dma_unmap and frees the associated memory. However, the hardware still retains a reference to the same memory address. If the kernel later reallocates this address, unaware that the hardware is still using it, it can lead to memory corruption-since the host might access or modify memory that is still actively referenced by the hardware. Implement a retry mechanism for the HAL_REO_CMD_UPDATE_RX_QUEUE command during TID deletion to prevent memory corruption. Introduce a new list, reo_cmd_update_rx_queue_list, in the struct ath12k_dp to track pending RX queue updates. Protect this list with reo_rxq_flush_lock, which also ensures synchronized access to reo_cmd_cache_flush_list. Defer memory release until hardware confirms the virtual address is no longer in use, avoiding immediate deallocation on command failure. Release memory for pending RX queue updates via ath12k_dp_rx_reo_cmd_list_cleanup() on system reset if hardware confirmation is not received. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 Signed-off-by: Manish Dharanenthiran <manish.dharanenthiran@oss.qualcomm.com> Co-developed-by: Nithyanantham Paramasivam <nithyanantham.paramasivam@oss.qualcomm.com> Signed-off-by: Nithyanantham Paramasivam <nithyanantham.paramasivam@oss.qualcomm.com> Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com> Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com> Link: https://patch.msgid.link/20250806111750.3214584-6-nithyanantham.paramasivam@oss.qualcomm.com Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com> |
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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 reStructuredText 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.