linux-kernel - [PATCH 3.19.y-ckt 229/251] ath10k: fix insufficient tracing buffer size

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Message-Id: <1437008972-9140-230-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:09:10 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Michal Kazior <michal.kazior@...to.com>,
	Kalle Valo <kvalo@....qualcomm.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 229/251] ath10k: fix insufficient tracing buffer size

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

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

From: Michal Kazior <michal.kazior@...to.com>

commit f42f8eb27e5077cb1881da8f006bff19a8924a9f upstream.

Some trace messages were truncated and a kernel
splat could be seen in the log:

  WARNING: CPU: 3 PID: 0 at /devel/src/linux/drivers/net/wireless/ath/ath10k/./trace.h:114 ftrace_raw_event_ath10k_log_dbg+0x20e/0x220 [ath10k_core]()
  Modules linked in: ath10k_pci(O) ath10k_core(O) ath iwldvm iwlwifi [last unloaded: iwlwifi]
  CPU: 3 PID: 0 Comm: swapper/3 Tainted: G        W  O    4.0.0-rc3-wl-ath+ #703
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
   ffffffffa01d4cb0 ffff88001fd83998 ffffffff8191b86c ffffffff81e3b718
   0000000000000000 ffff88001fd839d8 ffffffff8105573a ffff88001c0a5528
   ffff88001bea9ae0 ffff88001c3dd940 00000000000d0018 ffff88001fd83a80
  Call Trace:
   <IRQ>  [<ffffffff8191b86c>] dump_stack+0x45/0x57
   [<ffffffff8105573a>] warn_slowpath_common+0x8a/0xc0
   [<ffffffff8105582a>] warn_slowpath_null+0x1a/0x20
   [<ffffffffa01c61fe>] ftrace_raw_event_ath10k_log_dbg+0x20e/0x220 [ath10k_core]
   [<ffffffffa01aaa6b>] ath10k_dbg+0xbb/0xd0 [ath10k_core]
   [<ffffffff810eed89>] ? trace_clock_local+0x9/0x10
   [<ffffffffa01bd069>] ath10k_wmi_event_service_ready+0x479/0x520 [ath10k_core]
   [<ffffffff810fdf90>] ? trace_buffer_unlock_commit+0x50/0x60
   [<ffffffffa01c2113>] ath10k_wmi_tlv_op_rx+0x6b3/0x8b0 [ath10k_core]

This could be reproduced with:

  trace-cmd record -e ath10k
  ifconfig wlan0 down
  ifconfig wlan0 up

Fixes: 5c01aa3de918 ("ath10k: deduplicate wmi service ready logic")
Fixes: ca996ec56608 ("ath10k: implement wmi-tlv backend")
Signed-off-by: Michal Kazior <michal.kazior@...to.com>
Signed-off-by: Kalle Valo <kvalo@....qualcomm.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/wireless/ath/ath10k/trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/trace.h b/drivers/net/wireless/ath/ath10k/trace.h
index 571d7cb..fa4bb625 100644
--- a/drivers/net/wireless/ath/ath10k/trace.h
+++ b/drivers/net/wireless/ath/ath10k/trace.h
@@ -51,7 +51,7 @@ static inline void trace_ ## name(proto) {}
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM ath10k

-#define ATH10K_MSG_MAX 200
+#define ATH10K_MSG_MAX 400

 DECLARE_EVENT_CLASS(ath10k_log_event,
 	TP_PROTO(struct ath10k *ar, struct va_format *vaf),
-- 
1.9.1

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