From 9a7308341b71f3c5e88e6a30f9d6a1cfb3bc2b4f Mon Sep 17 00:00:00 2001 From: Kalle Valo Date: Tue, 27 Sep 2011 23:33:28 +0300 Subject: [PATCH] ath6kl: silence "invalid rate" warning For some reason firmware is sending invalid rates when we try to query current bitrate from ath6kl_get_station() and a warning is issued: [ 3810.415720] ath6kl: invalid rate: 1935633515 [ 3811.105493] ath6kl: invalid rate: 1935633515 [ 3811.556063] ath6kl: invalid rate: 1935633515 As the warning happens way too often, convert the warning to a debug message once we have a proper fix. But to make it easy to follow how often the problem appears, add a debugfs to print various statistics about workarounds and make this issue the first WAR. Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath6kl/cfg80211.c | 4 ++- drivers/net/wireless/ath/ath6kl/core.h | 4 +++ drivers/net/wireless/ath/ath6kl/debug.c | 48 ++++++++++++++++++++++++++++++ drivers/net/wireless/ath/ath6kl/debug.h | 9 ++++++ 4 files changed, 64 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath6kl/cfg80211.c b/drivers/net/wireless/ath/ath6kl/cfg80211.c index c84f53d6..8d9fbd4 100644 --- a/drivers/net/wireless/ath/ath6kl/cfg80211.c +++ b/drivers/net/wireless/ath/ath6kl/cfg80211.c @@ -1365,7 +1365,9 @@ static int ath6kl_get_station(struct wiphy *wiphy, struct net_device *dev, sinfo->txrate.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH; sinfo->txrate.flags |= RATE_INFO_FLAGS_MCS; } else { - ath6kl_warn("invalid rate: %d\n", rate); + ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, + "invalid rate from stats: %d\n", rate); + ath6kl_debug_war(ar, ATH6KL_WAR_INVALID_RATE); return 0; } diff --git a/drivers/net/wireless/ath/ath6kl/core.h b/drivers/net/wireless/ath/ath6kl/core.h index 9ecf22b..6d8a484 100644 --- a/drivers/net/wireless/ath/ath6kl/core.h +++ b/drivers/net/wireless/ath/ath6kl/core.h @@ -525,6 +525,10 @@ struct ath6kl { unsigned int dbgfs_diag_reg; u32 diag_reg_addr_wr; u32 diag_reg_val_wr; + + struct { + unsigned int invalid_rate; + } war_stats; } debug; #endif /* CONFIG_ATH6KL_DEBUG */ }; diff --git a/drivers/net/wireless/ath/ath6kl/debug.c b/drivers/net/wireless/ath/ath6kl/debug.c index 4fc83cc..5237369 100644 --- a/drivers/net/wireless/ath/ath6kl/debug.c +++ b/drivers/net/wireless/ath/ath6kl/debug.c @@ -192,6 +192,51 @@ static int ath6kl_debugfs_open(struct inode *inode, struct file *file) return 0; } +void ath6kl_debug_war(struct ath6kl *ar, enum ath6kl_war war) +{ + switch (war) { + case ATH6KL_WAR_INVALID_RATE: + ar->debug.war_stats.invalid_rate++; + break; + } +} + +static ssize_t read_file_war_stats(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ath6kl *ar = file->private_data; + char *buf; + unsigned int len = 0, buf_len = 1500; + ssize_t ret_cnt; + + buf = kzalloc(buf_len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + len += scnprintf(buf + len, buf_len - len, "\n"); + len += scnprintf(buf + len, buf_len - len, "%25s\n", + "Workaround stats"); + len += scnprintf(buf + len, buf_len - len, "%25s\n\n", + "================="); + len += scnprintf(buf + len, buf_len - len, "%20s %10u\n", + "Invalid rates", ar->debug.war_stats.invalid_rate); + + if (WARN_ON(len > buf_len)) + len = buf_len; + + ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len); + + kfree(buf); + return ret_cnt; +} + +static const struct file_operations fops_war_stats = { + .read = read_file_war_stats, + .open = ath6kl_debugfs_open, + .owner = THIS_MODULE, + .llseek = default_llseek, +}; + static void ath6kl_debug_fwlog_add(struct ath6kl *ar, const void *buf, size_t buf_len) { @@ -873,6 +918,9 @@ int ath6kl_debug_init(struct ath6kl *ar) debugfs_create_file("reg_write", S_IRUSR | S_IWUSR, ar->debugfs_phy, ar, &fops_diag_reg_write); + debugfs_create_file("war_stats", S_IRUSR, ar->debugfs_phy, ar, + &fops_war_stats); + return 0; } diff --git a/drivers/net/wireless/ath/ath6kl/debug.h b/drivers/net/wireless/ath/ath6kl/debug.h index 89bf8e1..91f4bc3 100644 --- a/drivers/net/wireless/ath/ath6kl/debug.h +++ b/drivers/net/wireless/ath/ath6kl/debug.h @@ -52,6 +52,10 @@ extern int ath6kl_printk(const char *level, const char *fmt, ...) #define AR_DBG_LVL_CHECK(mask) (debug_mask & mask) +enum ath6kl_war { + ATH6KL_WAR_INVALID_RATE, +}; + #ifdef CONFIG_ATH6KL_DEBUG #define ath6kl_dbg(mask, fmt, ...) \ ({ \ @@ -79,6 +83,7 @@ void ath6kl_dump_registers(struct ath6kl_device *dev, struct ath6kl_irq_enable_reg *irq_en_reg); void dump_cred_dist_stats(struct htc_target *target); void ath6kl_debug_fwlog_event(struct ath6kl *ar, const void *buf, size_t len); +void ath6kl_debug_war(struct ath6kl *ar, enum ath6kl_war war); int ath6kl_debug_init(struct ath6kl *ar); void ath6kl_debug_cleanup(struct ath6kl *ar); @@ -110,6 +115,10 @@ static inline void ath6kl_debug_fwlog_event(struct ath6kl *ar, { } +static inline void ath6kl_debug_war(struct ath6kl *ar, enum ath6kl_war war) +{ +} + static inline int ath6kl_debug_init(struct ath6kl *ar) { return 0; -- 2.7.4