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| author | Johannes Berg <johannes@sipsolutions.net> | 2008-01-29 16:57:51 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-02-01 16:12:24 -0500 |
| commit | 6feeb8aad7925b4c00f785eac3039c772629b42f (patch) | |
| tree | d61348505908cfcddd1ff8af18f5bab613bbb6de /net | |
| parent | 24e1c13c93cbdd05e4b7ea921c0050b036555adc (diff) | |
| download | linux-stable-6feeb8aad7925b4c00f785eac3039c772629b42f.tar.gz linux-stable-6feeb8aad7925b4c00f785eac3039c772629b42f.tar.bz2 linux-stable-6feeb8aad7925b4c00f785eac3039c772629b42f.zip | |
mac80211: make alignment warning optional
Driver authors should be aware of the alignment requirements, but
not everybody cares about the warning. This patch makes it depend
on a new Kconfig symbol MAC80211_DEBUG_PACKET_ALIGNMENT which can
be enabled regardless of MAC80211_DEBUG and is recommended for
driver authors (only). This also restricts the warning to data
packets so other packets need not be realigned to not trigger the
warning.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/Kconfig | 12 | ||||
| -rw-r--r-- | net/mac80211/rx.c | 7 |
2 files changed, 19 insertions, 0 deletions
diff --git a/net/mac80211/Kconfig b/net/mac80211/Kconfig index 09c255002e56..e77592d050ce 100644 --- a/net/mac80211/Kconfig +++ b/net/mac80211/Kconfig @@ -98,6 +98,18 @@ config MAC80211_DEBUGFS Say N unless you know you need this. +config MAC80211_DEBUG_PACKET_ALIGNMENT + bool "Enable packet alignment debugging" + depends on MAC80211 + help + This option is recommended for driver authors and strongly + discouraged for everybody else, it will trigger a warning + when a driver hands mac80211 a buffer that is aligned in + a way that will cause problems with the IP stack on some + architectures. + + Say N unless you're writing a mac80211 based driver. + config MAC80211_DEBUG bool "Enable debugging output" depends on MAC80211 diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index d44c87269bcb..535407d07fa4 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -340,11 +340,15 @@ static u32 ieee80211_rx_load_stats(struct ieee80211_local *local, return load; } +#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT static ieee80211_txrx_result ieee80211_rx_h_verify_ip_alignment(struct ieee80211_txrx_data *rx) { int hdrlen; + if (!WLAN_FC_DATA_PRESENT(rx->fc)) + return TXRX_CONTINUE; + /* * Drivers are required to align the payload data in a way that * guarantees that the contained IP header is aligned to a four- @@ -371,11 +375,14 @@ ieee80211_rx_h_verify_ip_alignment(struct ieee80211_txrx_data *rx) return TXRX_CONTINUE; } +#endif ieee80211_rx_handler ieee80211_rx_pre_handlers[] = { ieee80211_rx_h_parse_qos, +#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT ieee80211_rx_h_verify_ip_alignment, +#endif NULL }; |