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authorVasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>2012-03-06 14:39:40 +0530
committerKalle Valo <kvalo@qca.qualcomm.com>2012-03-06 17:53:54 +0200
commit068a4633bf42501db3ec934beff07cd50c1b7e9d (patch)
treece9f87c4caa333517d2c77d7b0c3a85dbe820c2d
parent05e5bd0f3daddb0368a433af5b58be68c62dc365 (diff)
downloadop-kernel-dev-068a4633bf42501db3ec934beff07cd50c1b7e9d.zip
op-kernel-dev-068a4633bf42501db3ec934beff07cd50c1b7e9d.tar.gz
ath6kl: Fix kernel panic while receiving fwlog during boot
"ath6kl: Defer wiphy and netdev registration till the end of ath6kl_core_init()" causes kernel panic by accessing the unallocated debug resources during boot time. To fix this, split the debug initialization funtion into two, one initializes the debug resource and the other takes care of debugfs initialization. When this issue shows up the kernel crash dump would look like ath6kl_debug_fwlog_event+0x9c/0x10a [<c10666c9>] register_lock_class+0x57/0x288 [<c1065cd3>] ? trace_hardirqs_on+0xb/0xd [<f801f4c9>] ? ath6kl_debug_fwlog_event+0x9c/0x10a [<c1066a8a>] __lock_acquire+0x96/0xbe5 [<c106007b>] ? alarmtimer_suspend+0x80/0x127 [<c10258da>] ? vprintk+0x394/0x3b1 [<f801f4c9>] ? ath6kl_debug_fwlog_event+0x9c/0x10a [<c10676b3>] lock_acquire+0xda/0xf9 [<f801f4c9>] ? ath6kl_debug_fwlog_event+0x9c/0x10a [<c1532ce3>] _raw_spin_lock+0x28/0x58 [<f801f4c9>] ? ath6kl_debug_fwlog_event+0x9c/0x10a [<f801f4c9>] ath6kl_debug_fwlog_event+0x9c/0x10a [<f80310a4>] ath6kl_wmi_control_rx+0x69d/0xb50 [ath6kl_core] [<f802d2e1>] ? ath6kl_rx+0x3c/0x839 [ath6kl_core] [<f802d35d>] ath6kl_rx+0xb8/0x839 [ath6kl_core] [<c104b81e>] ? local_clock+0x2d/0x4e [<c102a0af>] ? _local_bh_enable_ip+0x94/0x98 [<f802bfc0>] ? ath6kl_alloc_amsdu_rxbuf+0xb7/0xb7 [<f8023b28>] ath6kl_htc_rxmsg_pending_handler+0x891/0x988 [ath6kl_core] [<f802bf00>] ? ath6kl_refill_amsdu_rxbufs+0x89/0x92 [<f802d2a5>] ? aggr_timeout+0xed/0xed [ath6kl_core] [<f802bfc0>] ? ath6kl_alloc_amsdu_rxbuf+0xb7/0xb7 [<f802c420>] ? ath6kl_tx_complete+0x376/0x376 [ath6kl_core] [<f8020e92>] ath6kl_hif_intr_bh_handler+0xf7/0x33e [<c138ab00>] ? mmc_host_disable+0x15/0x3a [<f8123b5c>] ath6kl_sdio_irq_handler+0x3c/0x90 [ath6kl_sdio] [<c1392f56>] sdio_irq_thread+0xb6/0x29c [<c1392ea0>] ? sdio_claim_irq+0x1cb/0x1cb [<c103d4c0>] kthread+0x67/0x6c [<c103d459>] ? __init_kthread_worker+0x42/0x42 [<c153903a>] kernel_thread_helper+0x6/0xd BUG: unable to handle kernel NULL pointer dereference at EIP: [<f801f4d4>] ath6kl_debug_fwlog_event+0xa7/0x10a kvalo: rename new function to ath6kl_debug_init_fs() and add a comment why it's needed Reported-by: Kalle Valo <kvalo@qca.qualcomm.com> Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
-rw-r--r--drivers/net/wireless/ath/ath6kl/core.c9
-rwxr-xr-xdrivers/net/wireless/ath/ath6kl/debug.c10
-rw-r--r--drivers/net/wireless/ath/ath6kl/debug.h9
3 files changed, 21 insertions, 7 deletions
diff --git a/drivers/net/wireless/ath/ath6kl/core.c b/drivers/net/wireless/ath/ath6kl/core.c
index e66cf43..84dd978 100644
--- a/drivers/net/wireless/ath/ath6kl/core.c
+++ b/drivers/net/wireless/ath/ath6kl/core.c
@@ -124,6 +124,8 @@ int ath6kl_core_init(struct ath6kl *ar)
set_bit(FIRST_BOOT, &ar->flag);
+ ath6kl_debug_init(ar);
+
ret = ath6kl_init_hw_start(ar);
if (ret) {
ath6kl_err("Failed to start hardware: %d\n", ret);
@@ -138,7 +140,7 @@ int ath6kl_core_init(struct ath6kl *ar)
if (ret)
goto err_rxbuf_cleanup;
- ret = ath6kl_debug_init(ar);
+ ret = ath6kl_debug_init_fs(ar);
if (ret) {
wiphy_unregister(ar->wiphy);
goto err_rxbuf_cleanup;
@@ -159,7 +161,7 @@ int ath6kl_core_init(struct ath6kl *ar)
ath6kl_err("Failed to instantiate a network device\n");
ret = -ENOMEM;
wiphy_unregister(ar->wiphy);
- goto err_debug_init;
+ goto err_rxbuf_cleanup;
}
ath6kl_dbg(ATH6KL_DBG_TRC, "%s: name=%s dev=0x%p, ar=0x%p\n",
@@ -167,9 +169,8 @@ int ath6kl_core_init(struct ath6kl *ar)
return ret;
-err_debug_init:
- ath6kl_debug_cleanup(ar);
err_rxbuf_cleanup:
+ ath6kl_debug_cleanup(ar);
ath6kl_htc_flush_rx_buf(ar->htc_target);
ath6kl_cleanup_amsdu_rxbufs(ar);
ath6kl_wmi_shutdown(ar->wmi);
diff --git a/drivers/net/wireless/ath/ath6kl/debug.c b/drivers/net/wireless/ath/ath6kl/debug.c
index 28b516f..645f923 100755
--- a/drivers/net/wireless/ath/ath6kl/debug.c
+++ b/drivers/net/wireless/ath/ath6kl/debug.c
@@ -1722,7 +1722,7 @@ static const struct file_operations fops_power_params = {
.llseek = default_llseek,
};
-int ath6kl_debug_init(struct ath6kl *ar)
+void ath6kl_debug_init(struct ath6kl *ar)
{
skb_queue_head_init(&ar->debug.fwlog_queue);
init_completion(&ar->debug.fwlog_completion);
@@ -1732,7 +1732,15 @@ int ath6kl_debug_init(struct ath6kl *ar)
* value from the firmware.
*/
ar->debug.fwlog_mask = 0;
+}
+/*
+ * Initialisation needs to happen in two stages as fwlog events can come
+ * before cfg80211 is initialised, and debugfs depends on cfg80211
+ * initialisation.
+ */
+int ath6kl_debug_init_fs(struct ath6kl *ar)
+{
ar->debugfs_phy = debugfs_create_dir("ath6kl",
ar->wiphy->debugfsdir);
if (!ar->debugfs_phy)
diff --git a/drivers/net/wireless/ath/ath6kl/debug.h b/drivers/net/wireless/ath/ath6kl/debug.h
index c5d5e6c..1803a0b 100644
--- a/drivers/net/wireless/ath/ath6kl/debug.h
+++ b/drivers/net/wireless/ath/ath6kl/debug.h
@@ -78,7 +78,8 @@ int ath6kl_debug_roam_tbl_event(struct ath6kl *ar, const void *buf,
size_t len);
void ath6kl_debug_set_keepalive(struct ath6kl *ar, u8 keepalive);
void ath6kl_debug_set_disconnect_timeout(struct ath6kl *ar, u8 timeout);
-int ath6kl_debug_init(struct ath6kl *ar);
+void ath6kl_debug_init(struct ath6kl *ar);
+int ath6kl_debug_init_fs(struct ath6kl *ar);
void ath6kl_debug_cleanup(struct ath6kl *ar);
#else
@@ -128,7 +129,11 @@ static inline void ath6kl_debug_set_disconnect_timeout(struct ath6kl *ar,
{
}
-static inline int ath6kl_debug_init(struct ath6kl *ar)
+static inline void ath6kl_debug_init(struct ath6kl *ar)
+{
+}
+
+static inline int ath6kl_debug_init_fs(struct ath6kl *ar)
{
return 0;
}
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