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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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f7969969f4
Bob reported that he got warnings in IBSS mode about the ssid_len being zero on a joined event, but only when kmemcheck was enabled. This appears to be due to a race condition between drivers and userspace, when the driver reports joined but the user in the meantime decided to leave the IBSS again, the warning would trigger. This was made more likely by kmemcheck delaying the code that does the check and sends the event. So first, make the warning trigger closer to the driver, which means it's not locked, but since only the warning depends on it that's ok. And secondly, users will not want to have spurious warnings at all, so make those that are known to be racy in such a way configurable. Reported-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
133 lines
3.5 KiB
Text
133 lines
3.5 KiB
Text
config CFG80211
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tristate "Improved wireless configuration API"
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depends on RFKILL || !RFKILL
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config NL80211_TESTMODE
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bool "nl80211 testmode command"
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depends on CFG80211
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help
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The nl80211 testmode command helps implementing things like
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factory calibration or validation tools for wireless chips.
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Select this option ONLY for kernels that are specifically
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built for such purposes.
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Debugging tools that are supposed to end up in the hands of
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users should better be implemented with debugfs.
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Say N.
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config CFG80211_DEVELOPER_WARNINGS
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bool "enable developer warnings"
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depends on CFG80211
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default n
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help
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This option enables some additional warnings that help
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cfg80211 developers and driver developers, but that can
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trigger due to races with userspace.
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For example, when a driver reports that it was disconnected
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from the AP, but the user disconnects manually at the same
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time, the warning might trigger spuriously due to races.
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Say Y only if you are developing cfg80211 or a driver based
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on it (or mac80211).
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config CFG80211_REG_DEBUG
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bool "cfg80211 regulatory debugging"
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depends on CFG80211
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default n
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---help---
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You can enable this if you want to debug regulatory changes.
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If unsure, say N.
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config CFG80211_DEFAULT_PS
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bool "enable powersave by default"
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depends on CFG80211
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default y
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help
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This option enables powersave mode by default.
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If this causes your applications to misbehave you should fix your
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applications instead -- they need to register their network
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latency requirement, see Documentation/power/pm_qos_interface.txt.
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config CFG80211_DEFAULT_PS_VALUE
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int
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default 1 if CFG80211_DEFAULT_PS
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default 0
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config CFG80211_DEBUGFS
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bool "cfg80211 DebugFS entries"
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depends on CFG80211 && DEBUG_FS
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---help---
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You can enable this if you want to debugfs entries for cfg80211.
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If unsure, say N.
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config WIRELESS_OLD_REGULATORY
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bool "Old wireless static regulatory definitions"
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default n
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---help---
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This option enables the old static regulatory information
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and uses it within the new framework. This option is available
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for historical reasons and it is advised to leave it off.
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For details see:
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http://wireless.kernel.org/en/developers/Regulatory
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Say N and if you say Y, please tell us why. The default is N.
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config WIRELESS_EXT
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bool "Wireless extensions"
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default y
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---help---
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This option enables the legacy wireless extensions
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(wireless network interface configuration via ioctls.)
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Say Y unless you've upgraded all your userspace to use
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nl80211 instead of wireless extensions.
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config WIRELESS_EXT_SYSFS
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bool "Wireless extensions sysfs files"
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default y
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depends on WIRELESS_EXT && SYSFS
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help
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This option enables the deprecated wireless statistics
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files in /sys/class/net/*/wireless/. The same information
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is available via the ioctls as well.
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Say Y if you have programs using it, like old versions of
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hal.
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config LIB80211
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tristate "Common routines for IEEE802.11 drivers"
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default n
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help
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This options enables a library of common routines used
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by IEEE802.11 wireless LAN drivers.
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Drivers should select this themselves if needed. Say Y if
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you want this built into your kernel.
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config LIB80211_CRYPT_WEP
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tristate
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config LIB80211_CRYPT_CCMP
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tristate
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config LIB80211_CRYPT_TKIP
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tristate
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config LIB80211_DEBUG
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bool "lib80211 debugging messages"
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depends on LIB80211
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default n
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---help---
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You can enable this if you want verbose debugging messages
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from lib80211.
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If unsure, say N.
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