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SubjectRe: [PATCH v2] rc80211_pid: Fix fast_start parameter handling
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This removes the fast_start parameter from the rc_pid parameters information
and instead uses the parameter macro when initializing the rc_pid state. Since
the parameter is only used on initialization, there is no point of making
exporting it via debugfs. This also fixes uninitialized memory references to
the fast_start and norm_offset parameters detected by the kmemcheck utility.
Thanks to Vegard Nossum for reporting the bug.

Signed-off-by: Mattias Nissler <mattias.nissler@gmx.de>
---
Updated patch description. Any more comments? Stefano? John?

Mattias


net/mac80211/rc80211_pid.h | 5 -----
net/mac80211/rc80211_pid_algo.c | 31 +++++++++++++------------------
2 files changed, 13 insertions(+), 23 deletions(-)
diff --git a/net/mac80211/rc80211_pid.h b/net/mac80211/rc80211_pid.h
index 04afc13..4ea7b97 100644
--- a/net/mac80211/rc80211_pid.h
+++ b/net/mac80211/rc80211_pid.h
@@ -141,7 +141,6 @@ struct rc_pid_events_file_info {
* rate behaviour values (lower means we should trust more what we learnt
* about behaviour of rates, higher means we should trust more the natural
* ordering of rates)
- * @fast_start: if Y, push high rates right after initialization
*/
struct rc_pid_debugfs_entries {
struct dentry *dir;
@@ -154,7 +153,6 @@ struct rc_pid_debugfs_entries {
struct dentry *sharpen_factor;
struct dentry *sharpen_duration;
struct dentry *norm_offset;
- struct dentry *fast_start;
};

void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
@@ -267,9 +265,6 @@ struct rc_pid_info {
/* Normalization offset. */
unsigned int norm_offset;

- /* Fast starst parameter. */
- unsigned int fast_start;
-
/* Rates information. */
struct rc_pid_rateinfo *rinfo;

diff --git a/net/mac80211/rc80211_pid_algo.c b/net/mac80211/rc80211_pid_algo.c
index a849b74..bcd27c1 100644
--- a/net/mac80211/rc80211_pid_algo.c
+++ b/net/mac80211/rc80211_pid_algo.c
@@ -398,13 +398,25 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
return NULL;
}

+ pinfo->target = RC_PID_TARGET_PF;
+ pinfo->sampling_period = RC_PID_INTERVAL;
+ pinfo->coeff_p = RC_PID_COEFF_P;
+ pinfo->coeff_i = RC_PID_COEFF_I;
+ pinfo->coeff_d = RC_PID_COEFF_D;
+ pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
+ pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
+ pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
+ pinfo->norm_offset = RC_PID_NORM_OFFSET;
+ pinfo->rinfo = rinfo;
+ pinfo->oldrate = 0;
+
/* Sort the rates. This is optimized for the most common case (i.e.
* almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed
* mapping too. */
for (i = 0; i < sband->n_bitrates; i++) {
rinfo[i].index = i;
rinfo[i].rev_index = i;
- if (pinfo->fast_start)
+ if (RC_PID_FAST_START)
rinfo[i].diff = 0;
else
rinfo[i].diff = i * pinfo->norm_offset;
@@ -425,19 +437,6 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
break;
}

- pinfo->target = RC_PID_TARGET_PF;
- pinfo->sampling_period = RC_PID_INTERVAL;
- pinfo->coeff_p = RC_PID_COEFF_P;
- pinfo->coeff_i = RC_PID_COEFF_I;
- pinfo->coeff_d = RC_PID_COEFF_D;
- pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
- pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
- pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
- pinfo->norm_offset = RC_PID_NORM_OFFSET;
- pinfo->fast_start = RC_PID_FAST_START;
- pinfo->rinfo = rinfo;
- pinfo->oldrate = 0;
-
#ifdef CONFIG_MAC80211_DEBUGFS
de = &pinfo->dentries;
de->dir = debugfs_create_dir("rc80211_pid",
@@ -465,9 +464,6 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
de->norm_offset = debugfs_create_u32("norm_offset",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->norm_offset);
- de->fast_start = debugfs_create_bool("fast_start",
- S_IRUSR | S_IWUSR, de->dir,
- &pinfo->fast_start);
#endif

return pinfo;
@@ -479,7 +475,6 @@ static void rate_control_pid_free(void *priv)
#ifdef CONFIG_MAC80211_DEBUGFS
struct rc_pid_debugfs_entries *de = &pinfo->dentries;

- debugfs_remove(de->fast_start);
debugfs_remove(de->norm_offset);
debugfs_remove(de->sharpen_duration);
debugfs_remove(de->sharpen_factor);
--
1.5.6.1


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