[PATCH for-4.4.y 00/10] Stable candidates for linux-4.4.y

[PATCH for-4.4.y 00/10] Stable candidates for linux-4.4.y

[Amit Pundir]

Hi Greg,

Few stable candidates for 4.4.y for your consideration.
Cherry picked and build tested on linux-4.4.165 for
ARCH=arm/arm64 + allmodconfig.

Few fixes are applicable for 3.18.y as well, but they
needed minor rebasing, so I'll submit them shortly in
a separate thread.

Regards,
Amit Pundir


Amitkumar Karwar (1):
  mwifiex: Fix NULL pointer dereference in skb_dequeue()

Johannes Thumshirn (1):
  cw1200: Don't leak memory if krealloc failes

Karthik D A (1):
  mwifiex: fix p2p device doesn't find in scan problem

Liping Zhang (1):
  netfilter: nf_tables: fix oops when inserting an element into a
    verdict map

Mauricio Faria de Oliveira (1):
  scsi: qla2xxx: do not queue commands when unloading

Subhash Jadavani (2):
  scsi: ufs: fix race between clock gating and devfreq scaling work
  scsi: ufshcd: release resources if probe fails

Vasanthakumar Thiagarajan (1):
  ath10k: fix kernel panic due to race in accessing arvif list

Venkat Gopalakrishnan (1):
  scsi: ufshcd: Fix race between clk scaling and ungate work

Yaniv Gardi (1):
  scsi: ufs: fix bugs related to null pointer access and array size

 drivers/net/wireless/ath/ath10k/mac.c   |  6 +++
 drivers/net/wireless/cw1200/wsm.c       | 16 ++++---
 drivers/net/wireless/mwifiex/cfg80211.c | 10 ++++-
 drivers/net/wireless/mwifiex/wmm.c      | 12 ++++--
 drivers/scsi/qla2xxx/qla_os.c           |  5 +++
 drivers/scsi/ufs/ufs.h                  |  3 +-
 drivers/scsi/ufs/ufshcd-pci.c           |  2 +
 drivers/scsi/ufs/ufshcd-pltfrm.c        |  5 +--
 drivers/scsi/ufs/ufshcd.c               | 75 +++++++++++++++++++++++++++++----
 net/netfilter/nf_tables_api.c           |  1 +
 10 files changed, 110 insertions(+), 25 deletions(-)

-- 
2.7.4

[PATCH for-4.4.y 01/10] ath10k: fix kernel panic due to race in accessing arvif list

[Amit Pundir]

From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>

commit ebaa4b1620bf69f2bc43cb45ea85fbafdaec23c3 upstream.

arvifs list is traversed within data_lock spin_lock in tasklet
context to fill channel information from the corresponding vif.
This means any access to arvifs list for add/del operations
should also be protected with the same spin_lock to avoid the
race. Fix this by performing list add/del on arvfis within the
data_lock. This could fix kernel panic something like the below.

 LR is at ath10k_htt_rx_pktlog_completion_handler+0x100/0xb6c [ath10k_core]
 PC is at ath10k_htt_rx_pktlog_completion_handler+0x1c0/0xb6c [ath10k_core]
 Internal error: Oops: 17 [#1] PREEMPT SMP ARM
 [<bf4857f4>] (ath10k_htt_rx_pktlog_completion_handler+0x2f4/0xb6c [ath10k_core])
 [<bf487540>] (ath10k_htt_txrx_compl_task+0x8b4/0x1188 [ath10k_core])
 [<c00312d4>] (tasklet_action+0x8c/0xec)
 [<c00309a8>] (__do_softirq+0xdc/0x208)
 [<c0030d6c>] (irq_exit+0x84/0xe0)
 [<c005db04>] (__handle_domain_irq+0x80/0xa0)
 [<c00085c4>] (gic_handle_irq+0x38/0x5c)
 [<c0009640>] (__irq_svc+0x40/0x74)

(gdb) list *(ath10k_htt_rx_pktlog_completion_handler+0x1c0)
0x136c0 is in ath10k_htt_rx_h_channel (drivers/net/wireless/ath/ath10k/htt_rx.c:769)
764		struct cfg80211_chan_def def;
765
766		lockdep_assert_held(&ar->data_lock);
767
768		list_for_each_entry(arvif, &ar->arvifs, list) {
769			if (arvif->vdev_id == vdev_id &&
770			    ath10k_mac_vif_chan(arvif->vif, &def) == 0)
771				return def.chan;
772		}
773

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/net/wireless/ath/ath10k/mac.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 4644357d291a..398068ad0b62 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -4470,7 +4470,9 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
 	}
 
 	ar->free_vdev_map &= ~(1LL << arvif->vdev_id);
+	spin_lock_bh(&ar->data_lock);
 	list_add(&arvif->list, &ar->arvifs);
+	spin_unlock_bh(&ar->data_lock);
 
 	/* It makes no sense to have firmware do keepalives. mac80211 already
 	 * takes care of this with idle connection polling.
@@ -4603,7 +4605,9 @@ err_peer_delete:
 err_vdev_delete:
 	ath10k_wmi_vdev_delete(ar, arvif->vdev_id);
 	ar->free_vdev_map |= 1LL << arvif->vdev_id;
+	spin_lock_bh(&ar->data_lock);
 	list_del(&arvif->list);
+	spin_unlock_bh(&ar->data_lock);
 
 err:
 	if (arvif->beacon_buf) {
@@ -4647,7 +4651,9 @@ static void ath10k_remove_interface(struct ieee80211_hw *hw,
 			    arvif->vdev_id, ret);
 
 	ar->free_vdev_map |= 1LL << arvif->vdev_id;
+	spin_lock_bh(&ar->data_lock);
 	list_del(&arvif->list);
+	spin_unlock_bh(&ar->data_lock);
 
 	if (arvif->vdev_type == WMI_VDEV_TYPE_AP ||
 	    arvif->vdev_type == WMI_VDEV_TYPE_IBSS) {
-- 
2.7.4

[PATCH for-4.4.y 02/10] cw1200: Don't leak memory if krealloc failes

[Amit Pundir]

From: Johannes Thumshirn <jthumshirn@suse.de>

commit 9afdd6128c39f42398041bb2e017d8df0dcebcd1 upstream.

The call to krealloc() in wsm_buf_reserve() directly assigns the newly
returned memory to buf->begin. This is all fine except when krealloc()
failes we loose the ability to free the old memory pointed to by
buf->begin. If we just create a temporary variable to assign memory to
and assign the memory to it we can mitigate the memory leak.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

[AmitP: Refactored to fix driver file path in linux-4.4.y]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/net/wireless/cw1200/wsm.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/cw1200/wsm.c b/drivers/net/wireless/cw1200/wsm.c
index 3dd46c78c1cc..5a595f9f47ff 100644
--- a/drivers/net/wireless/cw1200/wsm.c
+++ b/drivers/net/wireless/cw1200/wsm.c
@@ -1805,16 +1805,18 @@ static int wsm_buf_reserve(struct wsm_buf *buf, size_t extra_size)
 {
 	size_t pos = buf->data - buf->begin;
 	size_t size = pos + extra_size;
+	u8 *tmp;
 
 	size = round_up(size, FWLOAD_BLOCK_SIZE);
 
-	buf->begin = krealloc(buf->begin, size, GFP_KERNEL | GFP_DMA);
-	if (buf->begin) {
-		buf->data = &buf->begin[pos];
-		buf->end = &buf->begin[size];
-		return 0;
-	} else {
-		buf->end = buf->data = buf->begin;
+	tmp = krealloc(buf->begin, size, GFP_KERNEL | GFP_DMA);
+	if (!tmp) {
+		wsm_buf_deinit(buf);
 		return -ENOMEM;
 	}
+
+	buf->begin = tmp;
+	buf->data = &buf->begin[pos];
+	buf->end = &buf->begin[size];
+	return 0;
 }
-- 
2.7.4

[PATCH for-4.4.y 03/10] mwifiex: Fix NULL pointer dereference in skb_dequeue()

[Amit Pundir]

From: Amitkumar Karwar <akarwar@marvell.com>

commit c44c040300d7afd79294710313a4989683e2afb1 upstream.

At couple of places in cleanup path, we are just going through the
skb queue and freeing them without unlinking. This leads to a crash
when other thread tries to do skb_dequeue() and use already freed node.

The problem is freed by unlinking skb before freeing it.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

[AmitP: Refactored to fix driver file path in linux-4.4.y]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/net/wireless/mwifiex/cfg80211.c |  4 +++-
 drivers/net/wireless/mwifiex/wmm.c      | 12 +++++++++---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 9a8982f581c5..6fcaa949b14a 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -2839,8 +2839,10 @@ int mwifiex_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
 
 	mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 
-	skb_queue_walk_safe(&priv->bypass_txq, skb, tmp)
+	skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
+		skb_unlink(skb, &priv->bypass_txq);
 		mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
+	}
 
 	if (netif_carrier_ok(priv->netdev))
 		netif_carrier_off(priv->netdev);
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index acccd6734e3b..ed8b69d1d65c 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -501,8 +501,10 @@ mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 	struct mwifiex_adapter *adapter = priv->adapter;
 	struct sk_buff *skb, *tmp;
 
-	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
+	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
+		skb_unlink(skb, &ra_list->skb_head);
 		mwifiex_write_data_complete(adapter, skb, 0, -1);
+	}
 }
 
 /*
@@ -598,11 +600,15 @@ mwifiex_clean_txrx(struct mwifiex_private *priv)
 		priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 
-	skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
+	skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) {
+		skb_unlink(skb, &priv->tdls_txq);
 		mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
+	}
 
-	skb_queue_walk_safe(&priv->bypass_txq, skb, tmp)
+	skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
+		skb_unlink(skb, &priv->bypass_txq);
 		mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
+	}
 	atomic_set(&priv->adapter->bypass_tx_pending, 0);
 
 	idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
-- 
2.7.4

[PATCH for-4.4.y 04/10] mwifiex: fix p2p device doesn't find in scan problem

[Amit Pundir]

From: Karthik D A <karthida@marvell.com>

commit 3d8bd85c2c9e47ed2c82348aa5b6029ed48376ae upstream.

Marvell p2p device disappears from the list of p2p peers on the other
p2p device after disconnection.

It happens due to a bug in driver. When interface is changed from p2p
to station, certain variables(bss_type, bss_role etc.) aren't correctly
updated. This patch corrects them to fix the issue.

Signed-off-by: Karthik D A <karthida@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

[AmitP: Refactored to fix driver file path in linux-4.4.y]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/net/wireless/mwifiex/cfg80211.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 6fcaa949b14a..1e074eaf613d 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -1150,6 +1150,12 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 			priv->adapter->curr_iface_comb.p2p_intf--;
 			priv->adapter->curr_iface_comb.sta_intf++;
 			dev->ieee80211_ptr->iftype = type;
+			if (mwifiex_deinit_priv_params(priv))
+				return -1;
+			if (mwifiex_init_new_priv_params(priv, dev, type))
+				return -1;
+			if (mwifiex_sta_init_cmd(priv, false, false))
+				return -1;
 			break;
 		case NL80211_IFTYPE_ADHOC:
 			if (mwifiex_cfg80211_deinit_p2p(priv))
-- 
2.7.4

[PATCH for-4.4.y 05/10] scsi: ufs: fix bugs related to null pointer access and array size

[Amit Pundir]

From: Yaniv Gardi <ygardi@codeaurora.org>

commit e3ce73d69aff44421d7899b235fec5ac2c306ff4 upstream.

In this change there are a few fixes of possible NULL pointer access and
possible access to index that exceeds array boundaries.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

[AmitP: Rebased for linux-4.4.y]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/scsi/ufs/ufs.h    |  3 ++-
 drivers/scsi/ufs/ufshcd.c | 25 +++++++++++++++++++------
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 42c459a9d3fe..ce5234555cc9 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -45,6 +45,7 @@
 #define QUERY_DESC_MIN_SIZE       2
 #define QUERY_OSF_SIZE            (GENERAL_UPIU_REQUEST_SIZE - \
 					(sizeof(struct utp_upiu_header)))
+#define RESPONSE_UPIU_SENSE_DATA_LENGTH	18
 
 #define UPIU_HEADER_DWORD(byte3, byte2, byte1, byte0)\
 			cpu_to_be32((byte3 << 24) | (byte2 << 16) |\
@@ -383,7 +384,7 @@ struct utp_cmd_rsp {
 	__be32 residual_transfer_count;
 	__be32 reserved[4];
 	__be16 sense_data_len;
-	u8 sense_data[18];
+	u8 sense_data[RESPONSE_UPIU_SENSE_DATA_LENGTH];
 };
 
 /**
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 8c58adadb728..0663cd6a19d3 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -813,10 +813,14 @@ static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
 	int len;
 	if (lrbp->sense_buffer &&
 	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
+		int len_to_copy;
+
 		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
+		len_to_copy = min_t(int, RESPONSE_UPIU_SENSE_DATA_LENGTH, len);
+
 		memcpy(lrbp->sense_buffer,
 			lrbp->ucd_rsp_ptr->sr.sense_data,
-			min_t(int, len, SCSI_SENSE_BUFFERSIZE));
+			min_t(int, len_to_copy, SCSI_SENSE_BUFFERSIZE));
 	}
 }
 
@@ -5251,7 +5255,10 @@ EXPORT_SYMBOL(ufshcd_system_suspend);
 
 int ufshcd_system_resume(struct ufs_hba *hba)
 {
-	if (!hba || !hba->is_powered || pm_runtime_suspended(hba->dev))
+	if (!hba)
+		return -EINVAL;
+
+	if (!hba->is_powered || pm_runtime_suspended(hba->dev))
 		/*
 		 * Let the runtime resume take care of resuming
 		 * if runtime suspended.
@@ -5272,7 +5279,10 @@ EXPORT_SYMBOL(ufshcd_system_resume);
  */
 int ufshcd_runtime_suspend(struct ufs_hba *hba)
 {
-	if (!hba || !hba->is_powered)
+	if (!hba)
+		return -EINVAL;
+
+	if (!hba->is_powered)
 		return 0;
 
 	return ufshcd_suspend(hba, UFS_RUNTIME_PM);
@@ -5302,10 +5312,13 @@ EXPORT_SYMBOL(ufshcd_runtime_suspend);
  */
 int ufshcd_runtime_resume(struct ufs_hba *hba)
 {
-	if (!hba || !hba->is_powered)
+	if (!hba)
+		return -EINVAL;
+
+	if (!hba->is_powered)
 		return 0;
-	else
-		return ufshcd_resume(hba, UFS_RUNTIME_PM);
+
+	return ufshcd_resume(hba, UFS_RUNTIME_PM);
 }
 EXPORT_SYMBOL(ufshcd_runtime_resume);
 
-- 
2.7.4

[PATCH for-4.4.y 06/10] scsi: ufshcd: Fix race between clk scaling and ungate work

[Amit Pundir]

From: Venkat Gopalakrishnan <venkatg@codeaurora.org>

commit f2a785ac23125fa0774327d39e837e45cf28fe92 upstream.

The ungate work turns on the clock before it exits hibern8, if the link
was put in hibern8 during clock gating work.  There occurs a race
condition when clock scaling work calls ufshcd_hold() to make sure low
power states cannot be entered, but that returns by checking only
whether the clocks are on.  This causes the clock scaling work to issue
UIC commands when the link is in hibern8 causing failures. Make sure we
exit hibern8 state before returning from ufshcd_hold().

Callstacks for race condition:

 ufshcd_scale_gear
 ufshcd_devfreq_scale
 ufshcd_devfreq_target
 update_devfreq
 devfreq_monitor
 process_one_work
 worker_thread
 kthread
 ret_from_fork

 ufshcd_uic_hibern8_exit
 ufshcd_ungate_work
 process_one_work
 worker_thread
 kthread
 ret_from_fork

Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 0663cd6a19d3..e4c940981eef 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -585,6 +585,21 @@ int ufshcd_hold(struct ufs_hba *hba, bool async)
 start:
 	switch (hba->clk_gating.state) {
 	case CLKS_ON:
+		/*
+		 * Wait for the ungate work to complete if in progress.
+		 * Though the clocks may be in ON state, the link could
+		 * still be in hibner8 state if hibern8 is allowed
+		 * during clock gating.
+		 * Make sure we exit hibern8 state also in addition to
+		 * clocks being ON.
+		 */
+		if (ufshcd_can_hibern8_during_gating(hba) &&
+		    ufshcd_is_link_hibern8(hba)) {
+			spin_unlock_irqrestore(hba->host->host_lock, flags);
+			flush_work(&hba->clk_gating.ungate_work);
+			spin_lock_irqsave(hba->host->host_lock, flags);
+			goto start;
+		}
 		break;
 	case REQ_CLKS_OFF:
 		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
-- 
2.7.4

[PATCH for-4.4.y 07/10] scsi: ufs: fix race between clock gating and devfreq scaling work

[Amit Pundir]

From: Subhash Jadavani <subhashj@codeaurora.org>

commit 30fc33f1ef475480dc5bea4fe1bda84b003b992c upstream.

UFS devfreq clock scaling work may require clocks to be ON if it need to
execute some UFS commands hence it may request for clock hold before
issuing the command. But if UFS clock gating work is already running in
parallel, ungate work would end up waiting for the clock gating work to
finish and as clock gating work would also wait for the clock scaling
work to finish, we would enter in deadlock state. Here is the call trace
during this deadlock state:

Workqueue: devfreq_wq devfreq_monitor
	__switch_to
	__schedule
	schedule
	schedule_timeout
	wait_for_common
	wait_for_completion
	flush_work
	ufshcd_hold
	ufshcd_send_uic_cmd
	ufshcd_dme_get_attr
	ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div
	ufs_qcom_clk_scale_notify
	ufshcd_scale_clks
	ufshcd_devfreq_target
	update_devfreq
	devfreq_monitor
	process_one_work
	worker_thread
	kthread
	ret_from_fork

Workqueue: events ufshcd_gate_work
	__switch_to
	__schedule
	schedule
	schedule_preempt_disabled
	__mutex_lock_slowpath
	mutex_lock
	devfreq_monitor_suspend
	devfreq_simple_ondemand_handler
	devfreq_suspend_device
	ufshcd_gate_work
	process_one_work
	worker_thread
	kthread
	ret_from_fork

Workqueue: events ufshcd_ungate_work
	__switch_to
	__schedule
	schedule
	schedule_timeout
	wait_for_common
	wait_for_completion
	flush_work
	__cancel_work_timer
	cancel_delayed_work_sync
	ufshcd_ungate_work
	process_one_work
	worker_thread
	kthread
	ret_from_fork

This change fixes this deadlock by doing this in devfreq work (devfreq_wq):
Try cancelling clock gating work. If we are able to cancel gating work
or it wasn't scheduled, hold the clock reference count until scaling is
in progress. If gate work is already running in parallel, let's skip
the frequecy scaling at this time and it will be retried once next scaling
window expires.

Reviewed-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/scsi/ufs/ufshcd.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index e4c940981eef..7e6ba17d61f8 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5511,15 +5511,47 @@ static int ufshcd_devfreq_target(struct device *dev,
 {
 	int err = 0;
 	struct ufs_hba *hba = dev_get_drvdata(dev);
+	bool release_clk_hold = false;
+	unsigned long irq_flags;
 
 	if (!ufshcd_is_clkscaling_enabled(hba))
 		return -EINVAL;
 
+	spin_lock_irqsave(hba->host->host_lock, irq_flags);
+	if (ufshcd_eh_in_progress(hba)) {
+		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+		return 0;
+	}
+
+	if (ufshcd_is_clkgating_allowed(hba) &&
+	    (hba->clk_gating.state != CLKS_ON)) {
+		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
+			/* hold the vote until the scaling work is completed */
+			hba->clk_gating.active_reqs++;
+			release_clk_hold = true;
+			hba->clk_gating.state = CLKS_ON;
+		} else {
+			/*
+			 * Clock gating work seems to be running in parallel
+			 * hence skip scaling work to avoid deadlock between
+			 * current scaling work and gating work.
+			 */
+			spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+			return 0;
+		}
+	}
+	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+
 	if (*freq == UINT_MAX)
 		err = ufshcd_scale_clks(hba, true);
 	else if (*freq == 0)
 		err = ufshcd_scale_clks(hba, false);
 
+	spin_lock_irqsave(hba->host->host_lock, irq_flags);
+	if (release_clk_hold)
+		__ufshcd_release(hba);
+	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
+
 	return err;
 }
 
-- 
2.7.4

[PATCH for-4.4.y 08/10] scsi: ufshcd: release resources if probe fails

[Amit Pundir]

From: Subhash Jadavani <subhashj@codeaurora.org>

commit afa3dfd42d205b106787476647735aa1de1a5d02 upstream.

If ufshcd pltfrm/pci driver's probe fails for some reason then ensure
that scsi host is released to avoid memory leak but managed memory
allocations (via devm_* calls) need not to be freed explicitly on probe
failure as memory allocated with these functions is automatically freed
on driver detach.

Reviewed-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

[AmitP: Rebased for linux-4.4.y]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/scsi/ufs/ufshcd-pci.c    | 2 ++
 drivers/scsi/ufs/ufshcd-pltfrm.c | 5 +----
 drivers/scsi/ufs/ufshcd.c        | 3 ---
 3 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index d15eaa466c59..52b546fb509b 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -104,6 +104,7 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
 	pm_runtime_forbid(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 	ufshcd_remove(hba);
+	ufshcd_dealloc_host(hba);
 }
 
 /**
@@ -147,6 +148,7 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	err = ufshcd_init(hba, mmio_base, pdev->irq);
 	if (err) {
 		dev_err(&pdev->dev, "Initialization failed\n");
+		ufshcd_dealloc_host(hba);
 		return err;
 	}
 
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 9714f2a8b329..f58abfcdfe81 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -161,7 +161,7 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
 	if (ret) {
 		dev_err(dev, "%s: unable to find %s err %d\n",
 				__func__, prop_name, ret);
-		goto out_free;
+		goto out;
 	}
 
 	vreg->min_uA = 0;
@@ -183,9 +183,6 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
 
 	goto out;
 
-out_free:
-	devm_kfree(dev, vreg);
-	vreg = NULL;
 out:
 	if (!ret)
 		*out_vreg = vreg;
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 7e6ba17d61f8..c94d465de941 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5385,8 +5385,6 @@ void ufshcd_remove(struct ufs_hba *hba)
 	ufshcd_disable_intr(hba, hba->intr_mask);
 	ufshcd_hba_stop(hba);
 
-	scsi_host_put(hba->host);
-
 	ufshcd_exit_clk_gating(hba);
 	if (ufshcd_is_clkscaling_enabled(hba))
 		devfreq_remove_device(hba->devfreq);
@@ -5733,7 +5731,6 @@ exit_gating:
 	ufshcd_exit_clk_gating(hba);
 out_disable:
 	hba->is_irq_enabled = false;
-	scsi_host_put(host);
 	ufshcd_hba_exit(hba);
 out_error:
 	return err;
-- 
2.7.4

[PATCH for-4.4.y 09/10] scsi: qla2xxx: do not queue commands when unloading

[Amit Pundir]

From: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>

commit 04dfaa53a0b6e66b328a5bc549e3af8f8b6eac02 upstream.

When the driver is unloading, in qla2x00_remove_one(), there is a single
call/point in time to abort ongoing commands, qla2x00_abort_all_cmds(),
which is still several steps away from the call to scsi_remove_host().

If more commands continue to arrive and be processed during that
interval, when the driver is tearing down and releasing its structures,
it might potentially hit an oops due to invalid memory access:

    Unable to handle kernel paging request for data at address 0x00000138
    <...>
    NIP [d000000004700a40] qla2xxx_queuecommand+0x80/0x3f0 [qla2xxx]
    LR [d000000004700a10] qla2xxx_queuecommand+0x50/0x3f0 [qla2xxx]

So, fail commands in qla2xxx_queuecommand() if the UNLOADING bit is set.

Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 drivers/scsi/qla2xxx/qla_os.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 18b19744398a..ff5df33fc740 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -685,6 +685,11 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 	srb_t *sp;
 	int rval;
 
+	if (unlikely(test_bit(UNLOADING, &base_vha->dpc_flags))) {
+		cmd->result = DID_NO_CONNECT << 16;
+		goto qc24_fail_command;
+	}
+
 	if (ha->flags.eeh_busy) {
 		if (ha->flags.pci_channel_io_perm_failure) {
 			ql_dbg(ql_dbg_aer, vha, 0x9010,
-- 
2.7.4

[PATCH for-4.4.y 10/10] netfilter: nf_tables: fix oops when inserting an element into a verdict map

[Amit Pundir]

From: Liping Zhang <zlpnobody@gmail.com>

commit 58c78e104d937c1f560fb10ed9bb2dcde0db4fcf upstream.

Dalegaard says:
 The following ruleset, when loaded with 'nft -f bad.txt'
 ----snip----
 flush ruleset
 table ip inlinenat {
   map sourcemap {
     type ipv4_addr : verdict;
   }

   chain postrouting {
     ip saddr vmap @sourcemap accept
   }
 }
 add chain inlinenat test
 add element inlinenat sourcemap { 100.123.10.2 : jump test }
 ----snip----

 results in a kernel oops:
 BUG: unable to handle kernel paging request at 0000000000001344
 IP: [<ffffffffa07bf704>] nf_tables_check_loops+0x114/0x1f0 [nf_tables]
 [...]
 Call Trace:
  [<ffffffffa07c2aae>] ? nft_data_init+0x13e/0x1a0 [nf_tables]
  [<ffffffffa07c1950>] nft_validate_register_store+0x60/0xb0 [nf_tables]
  [<ffffffffa07c74b5>] nft_add_set_elem+0x545/0x5e0 [nf_tables]
  [<ffffffffa07bfdd0>] ? nft_table_lookup+0x30/0x60 [nf_tables]
  [<ffffffff8132c630>] ? nla_strcmp+0x40/0x50
  [<ffffffffa07c766e>] nf_tables_newsetelem+0x11e/0x210 [nf_tables]
  [<ffffffff8132c400>] ? nla_validate+0x60/0x80
  [<ffffffffa030d9b4>] nfnetlink_rcv+0x354/0x5a7 [nfnetlink]

Because we forget to fill the net pointer in bind_ctx, so dereferencing
it may cause kernel crash.

Reported-by: Dalegaard <dalegaard@gmail.com>
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 net/netfilter/nf_tables_api.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 120e9ae04db3..a7967af0da82 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3452,6 +3452,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 		dreg = nft_type_to_reg(set->dtype);
 		list_for_each_entry(binding, &set->bindings, list) {
 			struct nft_ctx bind_ctx = {
+				.net	= ctx->net,
 				.afi	= ctx->afi,
 				.table	= ctx->table,
 				.chain	= (struct nft_chain *)binding->chain,
-- 
2.7.4