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When deleting a station or otherwise tearing down all aggregation sessions, make sure to delete requested but not yet started ones, to avoid the following scenario: * session is requested, added to tid_start_tx[] * ieee80211_ba_session_work() runs, gets past BLOCK_BA check * ieee80211_sta_tear_down_BA_sessions() runs, locks &sta->ampdu_mlme.mtx, e.g. while deleting the station - deleting all active sessions * ieee80211_ba_session_work() continues since tear down flushes it, and calls ieee80211_tx_ba_session_handle_start() for the new session, arms the timer for it * station deletion continues to __cleanup_single_sta() and frees the session struct, while the timer is armed Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.