lkml.org 
[lkml]   [2010]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[27/34] p54: disable channels with incomplete calibration data sets
2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Christian Lamparter <chunkeey@googlemail.com>

commit 93a59d7527147e3656664aa3179f8d19de256081 upstream.

James Grossmann [1] reported that p54 spews out confusing
messages instead of preventing the mayhem from happening.

the reason is that "p54: generate channel list dynamically"
is not perfect. It didn't discard incomplete channel data
sets and therefore p54 advertised to support them as well.

[1]: http://marc.info/?l=linux-wireless&m=125699830215890

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Reported-by: James Grossmann <cctsurf@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/wireless/p54/eeprom.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)

--- a/drivers/net/wireless/p54/eeprom.c
+++ b/drivers/net/wireless/p54/eeprom.c
@@ -126,7 +126,7 @@ static int p54_generate_band(struct ieee
int ret = -ENOMEM;

if ((!list->entries) || (!list->band_channel_num[band]))
- return 0;
+ return -EINVAL;

tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
@@ -158,6 +158,7 @@ static int p54_generate_band(struct ieee
(list->channels[i].data & CHAN_HAS_CURVE ? "" :
" [curve data]"),
list->channels[i].index, list->channels[i].freq);
+ continue;
}

tmp->channels[j].band = list->channels[i].band;
@@ -165,7 +166,16 @@ static int p54_generate_band(struct ieee
j++;
}

- tmp->n_channels = list->band_channel_num[band];
+ if (j == 0) {
+ printk(KERN_ERR "%s: Disabling totally damaged %s band.\n",
+ wiphy_name(dev->wiphy), (band == IEEE80211_BAND_2GHZ) ?
+ "2 GHz" : "5 GHz");
+
+ ret = -ENODATA;
+ goto err_out;
+ }
+
+ tmp->n_channels = j;
old = priv->band_table[band];
priv->band_table[band] = tmp;
if (old) {
@@ -228,13 +238,13 @@ static int p54_generate_channel_lists(st
struct p54_common *priv = dev->priv;
struct p54_channel_list *list;
unsigned int i, j, max_channel_num;
- int ret = -ENOMEM;
+ int ret = 0;
u16 freq;

if ((priv->iq_autocal_len != priv->curve_data->entries) ||
(priv->iq_autocal_len != priv->output_limit->entries))
- printk(KERN_ERR "%s: EEPROM is damaged... you may not be able"
- "to use all channels with this device.\n",
+ printk(KERN_ERR "%s: Unsupported or damaged EEPROM detected. "
+ "You may not be able to use all channels.\n",
wiphy_name(dev->wiphy));

max_channel_num = max_t(unsigned int, priv->output_limit->entries,
@@ -243,8 +253,10 @@ static int p54_generate_channel_lists(st
priv->curve_data->entries);

list = kzalloc(sizeof(*list), GFP_KERNEL);
- if (!list)
+ if (!list) {
+ ret = -ENOMEM;
goto free;
+ }

list->max_entries = max_channel_num;
list->channels = kzalloc(sizeof(struct p54_channel_entry) *
@@ -282,13 +294,8 @@ static int p54_generate_channel_lists(st
p54_compare_channels, NULL);

for (i = 0, j = 0; i < IEEE80211_NUM_BANDS; i++) {
- if (list->band_channel_num[i]) {
- ret = p54_generate_band(dev, list, i);
- if (ret)
- goto free;
-
+ if (p54_generate_band(dev, list, i) == 0)
j++;
- }
}
if (j == 0) {
/* no useable band available. */



\
 
 \ /
  Last update: 2010-05-25 01:13    [W:0.126 / U:34.428 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site