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openwrtv4/package/kernel/mac80211/patches/380-0005-ath10k-fix-kernel-panic-while-reading-tpc_stats.patch
Ansuel Smith 2dcd955aea mac80211: backport and update patches for ath10k 
This commit refreshes and updates the VHT160 ath10k support fix patches
and adds a number of backports from ath-next:

 * 8ed05ed06fca ath10k: handle tdls peer events
 * 229329ff345f ath10k: wmi: modify svc bitmap parsing for wcn3990
 * 14d65775687c ath10k: advertise TDLS wider bandwidth support for 5GHz
 * bc64d05220f3 ath10k: debugfs support to get final TPC stats for 10.4 variants
 * 8b2d93dd2261 ath10k: Fix kernel panic while using worker (ath10k_sta_rc_update_wk)
 * 4b190675ad06 ath10k: fix kernel panic while reading tpc_stats
 * be8cce96f14d ath10k: add support to configure channel dwell time
 * f40105e67478 ath: add support to get the detected radar specifications
 * 6f6eb1bcbeff ath10k: DFS Host Confirmation
 * 260e629bbf44 ath10k: fix memory leak of tpc_stats
 * 38441fb6fcbb ath10k: support use of channel 173
 * 2e9bcd0d7324 ath10k: fix spectral scan for QCA9984 and QCA9888 chipsets

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
[move backported patches in the 3xx number space, bring in upstream order,
 replace incomplete patch files with git format-patch ones, rewrite commit
 message, fix subject]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2018-07-22 22:25:33 +02:00

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From 4b190675ad06f5a6ecbeef0b01890c5fb372e3eb Mon Sep 17 00:00:00 2001
From: Tamizh Chelvam <tamizhr@codeaurora.org>
Date: Wed, 25 Apr 2018 11:36:44 +0300
Subject: [PATCH] ath10k: fix kernel panic while reading tpc_stats
When attempt to read tpc_stats for the chipsets which support
more than 3 tx chain will trigger kernel panic(kernel stack is corrupted)
due to writing values on rate_code array out of range.
This patch changes the array size depends on the WMI_TPC_TX_N_CHAIN and
added check to avoid write values on the array if the num tx chain
get in tpc config event is greater than WMI_TPC_TX_N_CHAIN.
Tested on QCA9984 with firmware-5.bin_10.4-3.5.3-00057
Kernel panic log :
[ 323.510944] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: bf90c654
[ 323.510944]
[ 323.524390] CPU: 0 PID: 1908 Comm: cat Not tainted 3.14.77 #31
[ 323.530224] [<c021db48>] (unwind_backtrace) from [<c021ac08>] (show_stack+0x10/0x14)
[ 323.537941] [<c021ac08>] (show_stack) from [<c03c53c0>] (dump_stack+0x80/0xa0)
[ 323.545146] [<c03c53c0>] (dump_stack) from [<c022e4ac>] (panic+0x84/0x1e4)
[ 323.552000] [<c022e4ac>] (panic) from [<c022e61c>] (__stack_chk_fail+0x10/0x14)
[ 323.559350] [<c022e61c>] (__stack_chk_fail) from [<bf90c654>] (ath10k_wmi_event_pdev_tpc_config+0x424/0x438 [ath10k_core])
[ 323.570471] [<bf90c654>] (ath10k_wmi_event_pdev_tpc_config [ath10k_core]) from [<bf90d800>] (ath10k_wmi_10_4_op_rx+0x2f0/0x39c [ath10k_core])
[ 323.583047] [<bf90d800>] (ath10k_wmi_10_4_op_rx [ath10k_core]) from [<bf8fcc18>] (ath10k_htc_rx_completion_handler+0x170/0x1a0 [ath10k_core])
[ 323.595702] [<bf8fcc18>] (ath10k_htc_rx_completion_handler [ath10k_core]) from [<bf961f44>] (ath10k_pci_hif_send_complete_check+0x1f0/0x220 [ath10k_pci])
[ 323.609421] [<bf961f44>] (ath10k_pci_hif_send_complete_check [ath10k_pci]) from [<bf96562c>] (ath10k_ce_per_engine_service+0x74/0xc4 [ath10k_pci])
[ 323.622490] [<bf96562c>] (ath10k_ce_per_engine_service [ath10k_pci]) from [<bf9656f0>] (ath10k_ce_per_engine_service_any+0x74/0x80 [ath10k_pci])
[ 323.635423] [<bf9656f0>] (ath10k_ce_per_engine_service_any [ath10k_pci]) from [<bf96365c>] (ath10k_pci_napi_poll+0x44/0xe8 [ath10k_pci])
[ 323.647665] [<bf96365c>] (ath10k_pci_napi_poll [ath10k_pci]) from [<c0599994>] (net_rx_action+0xac/0x160)
[ 323.657208] [<c0599994>] (net_rx_action) from [<c02324a4>] (__do_softirq+0x104/0x294)
[ 323.665017] [<c02324a4>] (__do_softirq) from [<c0232920>] (irq_exit+0x9c/0x11c)
[ 323.672314] [<c0232920>] (irq_exit) from [<c0217fc0>] (handle_IRQ+0x6c/0x90)
[ 323.679341] [<c0217fc0>] (handle_IRQ) from [<c02084e0>] (gic_handle_irq+0x3c/0x60)
[ 323.686893] [<c02084e0>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0x70)
[ 323.694349] Exception stack(0xdd489c58 to 0xdd489ca0)
[ 323.699384] 9c40: 00000000 a0000013
[ 323.707547] 9c60: 00000000 dc4bce40 60000013 ddc1d800 dd488000 00000990 00000000 c085c800
[ 323.715707] 9c80: 00000000 dd489d44 0000092d dd489ca0 c026e664 c026e668 60000013 ffffffff
[ 323.723877] [<c02095c0>] (__irq_svc) from [<c026e668>] (rcu_note_context_switch+0x170/0x184)
[ 323.732298] [<c026e668>] (rcu_note_context_switch) from [<c020e928>] (__schedule+0x50/0x4d4)
[ 323.740716] [<c020e928>] (__schedule) from [<c020e490>] (schedule_timeout+0x148/0x178)
[ 323.748611] [<c020e490>] (schedule_timeout) from [<c020f804>] (wait_for_common+0x114/0x154)
[ 323.756972] [<c020f804>] (wait_for_common) from [<bf8f6ef0>] (ath10k_tpc_stats_open+0xc8/0x340 [ath10k_core])
[ 323.766873] [<bf8f6ef0>] (ath10k_tpc_stats_open [ath10k_core]) from [<c02bb598>] (do_dentry_open+0x1ac/0x274)
[ 323.776741] [<c02bb598>] (do_dentry_open) from [<c02c838c>] (do_last+0x8c0/0xb08)
[ 323.784201] [<c02c838c>] (do_last) from [<c02c87e4>] (path_openat+0x210/0x598)
[ 323.791408] [<c02c87e4>] (path_openat) from [<c02c9d1c>] (do_filp_open+0x2c/0x78)
[ 323.798873] [<c02c9d1c>] (do_filp_open) from [<c02bc85c>] (do_sys_open+0x114/0x1b4)
[ 323.806509] [<c02bc85c>] (do_sys_open) from [<c0208c80>] (ret_fast_syscall+0x0/0x44)
[ 323.814241] CPU1: stopping
[ 323.816927] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.14.77 #31
[ 323.823008] [<c021db48>] (unwind_backtrace) from [<c021ac08>] (show_stack+0x10/0x14)
[ 323.830731] [<c021ac08>] (show_stack) from [<c03c53c0>] (dump_stack+0x80/0xa0)
[ 323.837934] [<c03c53c0>] (dump_stack) from [<c021cfac>] (handle_IPI+0xb8/0x140)
[ 323.845224] [<c021cfac>] (handle_IPI) from [<c02084fc>] (gic_handle_irq+0x58/0x60)
[ 323.852774] [<c02084fc>] (gic_handle_irq) from [<c02095c0>] (__irq_svc+0x40/0x70)
[ 323.860233] Exception stack(0xdd499fa0 to 0xdd499fe8)
[ 323.865273] 9fa0: ffffffed 00000000 1d3c9000 00000000 dd498000 dd498030 10c0387d c08b62c8
[ 323.873432] 9fc0: 4220406a 512f04d0 00000000 00000000 00000001 dd499fe8 c021838c c0218390
[ 323.881588] 9fe0: 60000013 ffffffff
[ 323.885070] [<c02095c0>] (__irq_svc) from [<c0218390>] (arch_cpu_idle+0x30/0x50)
[ 323.892454] [<c0218390>] (arch_cpu_idle) from [<c026500c>] (cpu_startup_entry+0xa4/0x108)
[ 323.900690] [<c026500c>] (cpu_startup_entry) from [<422085a4>] (0x422085a4)
Signed-off-by: Tamizh chelvam <tamizhr@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---
drivers/net/wireless/ath/ath10k/debug.c | 8 +++++++-
drivers/net/wireless/ath/ath10k/wmi.c | 6 ++++++
drivers/net/wireless/ath/ath10k/wmi.h | 2 +-
3 files changed, 14 insertions(+), 2 deletions(-)
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -1776,7 +1776,13 @@ static void ath10k_tpc_stats_print(struc
*len += scnprintf(buf + *len, buf_len - *len,
"********************************\n");
*len += scnprintf(buf + *len, buf_len - *len,
- "No. Preamble Rate_code tpc_value1 tpc_value2 tpc_value3\n");
+ "No. Preamble Rate_code ");
+
+ for (i = 0; i < WMI_TPC_TX_N_CHAIN; i++)
+ *len += scnprintf(buf + *len, buf_len - *len,
+ "tpc_value%d ", i);
+
+ *len += scnprintf(buf + *len, buf_len - *len, "\n");
for (i = 0; i < tpc_stats->rate_max; i++) {
*len += scnprintf(buf + *len, buf_len - *len,
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -4431,6 +4431,12 @@ void ath10k_wmi_event_pdev_tpc_config(st
num_tx_chain = __le32_to_cpu(ev->num_tx_chain);
+ if (num_tx_chain > WMI_TPC_TX_N_CHAIN) {
+ ath10k_warn(ar, "number of tx chain is %d greater than TPC configured tx chain %d\n",
+ num_tx_chain, WMI_TPC_TX_N_CHAIN);
+ return;
+ }
+
ath10k_wmi_tpc_config_get_rate_code(rate_code, pream_table,
num_tx_chain);
--- a/drivers/net/wireless/ath/ath10k/wmi.h
+++ b/drivers/net/wireless/ath/ath10k/wmi.h
@@ -4007,9 +4007,9 @@ struct wmi_pdev_get_tpc_config_cmd {
} __packed;
#define WMI_TPC_CONFIG_PARAM 1
-#define WMI_TPC_RATE_MAX 160
#define WMI_TPC_FINAL_RATE_MAX 240
#define WMI_TPC_TX_N_CHAIN 4
+#define WMI_TPC_RATE_MAX (WMI_TPC_TX_N_CHAIN * 65)
#define WMI_TPC_PREAM_TABLE_MAX 10
#define WMI_TPC_FLAG 3
#define WMI_TPC_BUF_SIZE 10
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