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ath5k: reduce exported channel list

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Claiming every available 5 ghz channel has a couple of negative
side-effects: scanning takes a long time, and the channel list
overflows the available buffer space for netlink commands,
resulting in:

    $ iw phy phy0 info
    command failed: No buffer space available (-105)

This patch adds a modparam so people who want to see all the channels
can do so by passing all_channels=1.  By default users will see a
smaller list of channels.  This also halves scan time, from 10 seconds
down to less than 5 when using world regulatory.

Changes-licensed-under: 3-Clause-BSD

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Reported-by: Simon Farnsworth <simon@farnz.org.uk>
Tested-By: Simon Farnsworth <simon@farnz.org.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bob Copeland 2009-03-30 08:05:29 -04:00 committed by John W. Linville
parent d5522e0395
commit 42639fcd44
1 changed files with 21 additions and 0 deletions
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21
drivers/net/wireless/ath5k/base.c
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@ -64,6 +64,10 @@ static int modparam_nohwcrypt;
module_param_named(nohwcrypt, modparam_nohwcrypt, int, 0444);
MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
static int modparam_all_channels;
module_param_named(all_channels, modparam_all_channels, int, 0444);
MODULE_PARM_DESC(all_channels, "Expose all channels the device can use.");
/******************\
* Internal defines *
@ -862,6 +866,20 @@ ath5k_ieee2mhz(short chan)
return 2212 + chan * 20;
}
/*
* Returns true for the channel numbers used without all_channels modparam.
*/
static bool ath5k_is_standard_channel(short chan)
{
return ((chan <= 14) ||
/* UNII 1,2 */
((chan & 3) == 0 && chan >= 36 && chan <= 64) ||
/* midband */
((chan & 3) == 0 && chan >= 100 && chan <= 140) ||
/* UNII-3 */
((chan & 3) == 1 && chan >= 149 && chan <= 165));
}
static unsigned int
ath5k_copy_channels(struct ath5k_hw *ah,
struct ieee80211_channel *channels,
@ -899,6 +917,9 @@ ath5k_copy_channels(struct ath5k_hw *ah,
if (!ath5k_channel_ok(ah, freq, chfreq))
continue;
if (!modparam_all_channels && !ath5k_is_standard_channel(ch))
continue;
/* Write channel info and increment counter */
channels[count].center_freq = freq;
channels[count].band = (chfreq == CHANNEL_2GHZ) ?