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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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| README | ||
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.