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  1. 08 5月, 2010 6 次提交
    • S
      ath9k_htc: Fix beaconing in IBSS mode · 9c6dda4e
      由 Sujith 提交于 
      The current way of managing beaconing in ad-hoc
mode has a subtle race - the beacon obtained from mac80211
is freed in the SWBA handler rather than the TX
completion routine. But transmission of beacons goes
through the normal SKB queue maintained in hif_usb,
leading to a situation where __skb_dequeue() in the TX
completion handler goes kaput.

Fix this by simply getting a beacon from mac80211 for
every SWBA and free it in its completion routine.
Signed-off-by: NSujith <Sujith.Manoharan@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      9c6dda4e
    • J
      mac80211: improve HT channel handling · 0aaffa9b
      由 Johannes Berg 提交于 
      Currently, when one interface switches HT mode,
all others will follow along. This is clearly
undesirable, since the new one might switch to
no-HT while another one is operating in HT.

Address this issue by keeping track of the HT
mode per interface, and allowing only changes
that are compatible, i.e. switching into HT40+
is not possible when another interface is in
HT40-, in that case the second one needs to
fall back to HT20.

Also, to allow drivers to know what's going on,
store the per-interface HT mode (channel type)
in the virtual interface's bss_conf.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      0aaffa9b
    • J
      cfg80211/mac80211: better channel handling · f444de05
      由 Johannes Berg 提交于 
      Currently (all tested with hwsim) you can do stupid
things like setting up an AP on a certain channel,
then adding another virtual interface and making
that associate on another channel -- this will make
the beaconing to move channel but obviously without
the necessary IEs data update.

In order to improve this situation, first make the
configuration APIs (cfg80211 and nl80211) aware of
multi-channel operation -- we'll eventually need
that in the future anyway. There's one userland API
change and one API addition. The API change is that
now SET_WIPHY must be called with virtual interface
index rather than only wiphy index in order to take
effect for that interface -- luckily all current
users (hostapd) do that. For monitor interfaces, the
old setting is preserved, but monitors are always
slaved to other devices anyway so no guarantees.

The second userland API change is the introduction
of a per virtual interface SET_CHANNEL command, that
hostapd should use going forward to make it easier
to understand what's going on (it can automatically
detect a kernel with this command).

Other than mac80211, no existing cfg80211 drivers
are affected by this change because they only allow
a single virtual interface.

mac80211, however, now needs to be aware that the
channel settings are per interface now, and needs
to disallow (for now) real multi-channel operation,
which is another important part of this patch.

One of the immediate benefits is that you can now
start hostapd to operate on a hardware that already
has a connection on another virtual interface, as
long as you specify the same channel.

Note that two things are left unhandled (this is an
improvement -- not a complete fix):

 * different HT/no-HT modes

   currently you could start an HT AP and then
   connect to a non-HT network on the same channel
   which would configure the hardware for no HT;
   that can be fixed fairly easily

 * CSA

   An AP we're connected to on a virtual interface
   might indicate switching channels, and in that
   case we would follow it, regardless of how many
   other interfaces are operating; this requires
   more effort to fix but is pretty rare after all
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      f444de05
    • D
      orinoco: refactor xmit path · bac6fafd
      由 David Kilroy 提交于 
      ... so orinoco_usb can share some common functionality.

Handle 802.2 encapsulation and MIC calculation in that function.
The 802.3 header is prepended to the SKB. The calculated MIC is written
to a specified buffer. Also modify the transmit control word that will
be passed onto the hardware to specify whether the MIC is present, and
the key used.
Signed-off-by: NDavid Kilroy <kilroyd@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      bac6fafd
    • F
      ath9k: fix another source of corrupt frames · 3ef83d74
      由 Felix Fietkau 提交于 
      Atheros hardware supports receiving frames that span multiple
descriptors and buffers. In this case, the rx status of every
descriptor except for the last one is invalid and may contain random
data. Because the driver does not support this, it needs to drop such
frames.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      3ef83d74
    • C
      ar9170usb: remove deprecated aggregation code · f3926b49
      由 Christian Lamparter 提交于 
      This patch removes the incomplete AMPDU implementation in ar9170usb.

The code in question is:
 * too big and complex (more than 550 SLOC.)
   This is enough to qualify for a new separate code file!

 * unbalanced quantity & quality
	over-engineered areas like:
		* xmit scheduling and queuing frames for multiple HT peers
		* redundant frame sorting
	are confronted by gaping holes:
		* accurate transmission feedback
		* firmware error-handling and device reset
		* HT rate control algorithm

 * error-prone
	Since its inclusion, hardly anything was done to fix
	any of the outlined flaws from the initial commit message.

   => This also indicates poor maintainability.

 * relies heavily on several spinlocks.

As a result of this shortcomings, the code is slow and does not
even support the most basic 11n requirement: HT station mode.

Therefore, I request to purge my heap of **** from the kernel:
"ar9170: implement transmit aggregation".

The next item on the agenda is: (re-)start from scratch with
an adequate design to accommodate the special requirements
and features of the available frameworks and tools.
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      f3926b49
  3. 06 5月, 2010 1 次提交
  5. 05 5月, 2010 6 次提交
  7. 04 5月, 2010 14 次提交
  9. 01 5月, 2010 12 次提交
  11. 29 4月, 2010 1 次提交
    • D
      iwl: cleanup: remove unneeded error handling · f7f7cc47
      由 Dan Carpenter 提交于 
      This is just a cleanup and doesn't change how the code works.

debugfs_create_dir() and debugfs_create_file() return an error pointer
(-ENODEV) if CONFIG_DEBUG_FS is not enabled, otherwise if an error occurs
they return NULL.  This is how they are implemented and what it says in
the DebugFS documentation.  DebugFS can not be compiled as a module.

As a result, we only need to check for error pointers and particularly
-ENODEV one time to know that DebugFS is enabled.  This patch keeps the
first check for error pointers and removes the rest.

The other reason for this patch, is that it silences some Smatch warnings.
Smatch sees the condition "(result != -ENODEV)" and assumes that it's
possible for "result" to equal -ENODEV.  If it were possible it would lead
to an error pointer dereference.  But since it's not, we can just remove
the check.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      f7f7cc47