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When continuously running wifi up/down sequence, the napi poll can be scheduled after the CE buffers being freed by ath10k_pci_flush Steps: In a certain condition, during wifi down below scenario might occur. ath10k_stop->ath10k_hif_stop->napi_schedule->ath10k_pci_flush->napi_poll(napi_synchronize). In the above scenario, CE buffer entries will be freed up and become NULL in ath10k_pci_flush. And the napi_poll has been invoked after the flush process and it will try to get the skb from the CE buffer entry and perform some action on that. Since the CE buffer already cleaned by pci flush this action will create NULL pointer dereference and trigger below kernel panic. Unable to handle kernel NULL pointer dereference at virtual address 0000005c PC is at ath10k_pci_htt_rx_cb+0x64/0x3ec [ath10k_pci] ath10k_pci_htt_rx_cb [ath10k_pci] ath10k_ce_per_engine_service+0x74/0xc4 [ath10k_pci] ath10k_ce_per_engine_service [ath10k_pci] ath10k_ce_per_engine_service_any+0x74/0x80 [ath10k_pci] ath10k_ce_per_engine_service_any [ath10k_pci] ath10k_pci_napi_poll+0x48/0xec [ath10k_pci] ath10k_pci_napi_poll [ath10k_pci] net_rx_action+0xac/0x160 net_rx_action __do_softirq+0xdc/0x208 __do_softirq irq_exit+0x84/0xe0 irq_exit __handle_domain_irq+0x80/0xa0 __handle_domain_irq gic_handle_irq+0x38/0x5c gic_handle_irq __irq_usr+0x44/0x60 Tested on QCA4019 and firmware version 10.4.3.2.1.1-00010 Signed-off-by: Tamizh chelvam <tamizhr@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> |
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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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.