[PATCH 0/5] updates and fixes intended for v6.2 2022-11-23

[PATCH 0/5] updates and fixes intended for v6.2 2022-11-23

[gregory.greenman]

From: Gregory Greenman <gregory.greenman@intel.com>

Hi,

Here's an additional patchset intended for v6.2

This patchset contains:
* several MEI fixes (Smatch errors and one detected during an internal testing)
* a fix for an old double-free bug in tx path
* an update for debug data printed after FW load

As usual, I'm pushing this to a pending branch, for kbuild bot, and
will send a pull-request later.

Please review.

Thanks,
Gregory

Avraham Stern (2):
  wifi: iwlwifi: mvm: trigger PCI re-enumeration in case of PLDR sync
  wifi: iwlwifi: mvm: return error value in case PLDR sync failed

Ben Greear (1):
  wifi: iwlwifi: mvm: fix double free on tx path.

Daniel Gabay (1):
  wifi: iwlwifi: mvm: print OTP info after alive

Gregory Greenman (1):
  wifi: iwlwifi: mei: fix parameter passing to iwl_mei_alive_notif()

 drivers/net/wireless/intel/iwlwifi/iwl-prph.h |  1 +
 .../net/wireless/intel/iwlwifi/iwl-trans.h    |  1 +
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c   | 29 +++++--
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 10 +++
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  2 +
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c  |  3 +
 drivers/net/wireless/intel/iwlwifi/mvm/tx.c   | 12 ++-
 .../net/wireless/intel/iwlwifi/pcie/trans.c   | 85 ++++++++++---------
 8 files changed, 99 insertions(+), 44 deletions(-)

-- 
2.35.3

[PATCH 1/5] wifi: iwlwifi: mvm: print OTP info after alive

[gregory.greenman]

From: Daniel Gabay <daniel.gabay@intel.com>

These are register values which are needed for debug regardless of alive
fail/success.

Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index ef43f6971cd9..b3101d12a0a1 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -354,6 +354,18 @@ static int iwl_mvm_load_ucode_wait_alive(struct iwl_mvm *mvm,
 	 */
 	ret = iwl_wait_notification(&mvm->notif_wait, &alive_wait,
 				    MVM_UCODE_ALIVE_TIMEOUT);
+
+	if (mvm->trans->trans_cfg->device_family ==
+	    IWL_DEVICE_FAMILY_AX210) {
+		/* print these registers regardless of alive fail/success */
+		IWL_INFO(mvm, "WFPM_UMAC_PD_NOTIFICATION: 0x%x\n",
+			 iwl_read_umac_prph(mvm->trans, WFPM_ARC1_PD_NOTIFICATION));
+		IWL_INFO(mvm, "WFPM_LMAC2_PD_NOTIFICATION: 0x%x\n",
+			 iwl_read_umac_prph(mvm->trans, WFPM_LMAC2_PD_NOTIFICATION));
+		IWL_INFO(mvm, "WFPM_AUTH_KEY_0: 0x%x\n",
+			 iwl_read_umac_prph(mvm->trans, SB_MODIFY_CFG_FLAG));
+	}
+
 	if (ret) {
 		struct iwl_trans *trans = mvm->trans;
 
-- 
2.35.3

[PATCH 2/5] wifi: iwlwifi: mvm: fix double free on tx path.

[gregory.greenman]

From: Ben Greear <greearb@candelatech.com>

We see kernel crashes and lockups and KASAN errors related to ax210
firmware crashes.  One of the KASAN dumps pointed at the tx path,
and it appears there is indeed a way to double-free an skb.

If iwl_mvm_tx_skb_sta returns non-zero, then the 'skb' sent into the
method will be freed.  But, in case where we build TSO skb buffer,
the skb may also be freed in error case.  So, return 0 in that particular
error case and do cleanup manually.

BUG: KASAN: use-after-free in __list_del_entry_valid+0x12/0x90
iwlwifi 0000:06:00.0: 0x00000000 | tsf hi
Read of size 8 at addr ffff88813cfa4ba0 by task btserver/9650

CPU: 4 PID: 9650 Comm: btserver Tainted: G        W         5.19.8+ #5
iwlwifi 0000:06:00.0: 0x00000000 | time gp1
Hardware name: Default string Default string/SKYBAY, BIOS 5.12 02/19/2019
Call Trace:
 <TASK>
 dump_stack_lvl+0x55/0x6d
 print_report.cold.12+0xf2/0x684
iwlwifi 0000:06:00.0: 0x1D0915A8 | time gp2
 ? __list_del_entry_valid+0x12/0x90
 kasan_report+0x8b/0x180
iwlwifi 0000:06:00.0: 0x00000001 | uCode revision type
 ? __list_del_entry_valid+0x12/0x90
 __list_del_entry_valid+0x12/0x90
iwlwifi 0000:06:00.0: 0x00000048 | uCode version major
 tcp_update_skb_after_send+0x5d/0x170
 __tcp_transmit_skb+0xb61/0x15c0
iwlwifi 0000:06:00.0: 0xDAA05125 | uCode version minor
 ? __tcp_select_window+0x490/0x490
iwlwifi 0000:06:00.0: 0x00000420 | hw version
 ? trace_kmalloc_node+0x29/0xd0
 ? __kmalloc_node_track_caller+0x12a/0x260
 ? memset+0x1f/0x40
 ? __build_skb_around+0x125/0x150
 ? __alloc_skb+0x1d4/0x220
 ? skb_zerocopy_clone+0x55/0x230
iwlwifi 0000:06:00.0: 0x00489002 | board version
 ? kmalloc_reserve+0x80/0x80
 ? rcu_read_lock_bh_held+0x60/0xb0
 tcp_write_xmit+0x3f1/0x24d0
iwlwifi 0000:06:00.0: 0x034E001C | hcmd
 ? __check_object_size+0x180/0x350
iwlwifi 0000:06:00.0: 0x24020000 | isr0
 tcp_sendmsg_locked+0x8a9/0x1520
iwlwifi 0000:06:00.0: 0x01400000 | isr1
 ? tcp_sendpage+0x50/0x50
iwlwifi 0000:06:00.0: 0x48F0000A | isr2
 ? lock_release+0xb9/0x400
 ? tcp_sendmsg+0x14/0x40
iwlwifi 0000:06:00.0: 0x00C3080C | isr3
 ? lock_downgrade+0x390/0x390
 ? do_raw_spin_lock+0x114/0x1d0
iwlwifi 0000:06:00.0: 0x00200000 | isr4
 ? rwlock_bug.part.2+0x50/0x50
iwlwifi 0000:06:00.0: 0x034A001C | last cmd Id
 ? rwlock_bug.part.2+0x50/0x50
 ? lockdep_hardirqs_on_prepare+0xe/0x200
iwlwifi 0000:06:00.0: 0x0000C2F0 | wait_event
 ? __local_bh_enable_ip+0x87/0xe0
 ? inet_send_prepare+0x220/0x220
iwlwifi 0000:06:00.0: 0x000000C4 | l2p_control
 tcp_sendmsg+0x22/0x40
 sock_sendmsg+0x5f/0x70
iwlwifi 0000:06:00.0: 0x00010034 | l2p_duration
 __sys_sendto+0x19d/0x250
iwlwifi 0000:06:00.0: 0x00000007 | l2p_mhvalid
 ? __ia32_sys_getpeername+0x40/0x40
iwlwifi 0000:06:00.0: 0x00000000 | l2p_addr_match
 ? rcu_read_lock_held_common+0x12/0x50
 ? rcu_read_lock_sched_held+0x5a/0xd0
 ? rcu_read_lock_bh_held+0xb0/0xb0
 ? rcu_read_lock_sched_held+0x5a/0xd0
 ? rcu_read_lock_sched_held+0x5a/0xd0
 ? lock_release+0xb9/0x400
 ? lock_downgrade+0x390/0x390
 ? ktime_get+0x64/0x130
 ? ktime_get+0x8d/0x130
 ? rcu_read_lock_held_common+0x12/0x50
 ? rcu_read_lock_sched_held+0x5a/0xd0
 ? rcu_read_lock_held_common+0x12/0x50
 ? rcu_read_lock_sched_held+0x5a/0xd0
 ? rcu_read_lock_bh_held+0xb0/0xb0
 ? rcu_read_lock_bh_held+0xb0/0xb0
 __x64_sys_sendto+0x6f/0x80
 do_syscall_64+0x34/0xb0
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f1d126e4531
Code: 00 00 00 00 0f 1f 44 00 00 f3 0f 1e fa 48 8d 05 35 80 0c 00 41 89 ca 8b 00 85 c0 75 1c 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 67 c3 66 0f 1f 44 00 00 55 48 83 ec 20 48 89
RSP: 002b:00007ffe21a679d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000000ffdc RCX: 00007f1d126e4531
RDX: 0000000000010000 RSI: 000000000374acf0 RDI: 0000000000000014
RBP: 00007ffe21a67ac0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 </TASK>

Allocated by task 9650:
 kasan_save_stack+0x1c/0x40
 __kasan_slab_alloc+0x6d/0x90
 kmem_cache_alloc_node+0xf3/0x2b0
 __alloc_skb+0x191/0x220
 tcp_stream_alloc_skb+0x3f/0x330
 tcp_sendmsg_locked+0x67c/0x1520
 tcp_sendmsg+0x22/0x40
 sock_sendmsg+0x5f/0x70
 __sys_sendto+0x19d/0x250
 __x64_sys_sendto+0x6f/0x80
 do_syscall_64+0x34/0xb0
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 9650:
 kasan_save_stack+0x1c/0x40
 kasan_set_track+0x21/0x30
 kasan_set_free_info+0x20/0x30
 __kasan_slab_free+0x102/0x170
 kmem_cache_free+0xc8/0x3e0
 iwl_mvm_mac_itxq_xmit+0x124/0x270 [iwlmvm]
 ieee80211_queue_skb+0x874/0xd10 [mac80211]
 ieee80211_xmit_fast+0xf80/0x1180 [mac80211]
 __ieee80211_subif_start_xmit+0x287/0x680 [mac80211]
 ieee80211_subif_start_xmit+0xcd/0x730 [mac80211]
 dev_hard_start_xmit+0xf6/0x420
 __dev_queue_xmit+0x165b/0x1b50
 ip_finish_output2+0x66e/0xfb0
 __ip_finish_output+0x487/0x6d0
 ip_output+0x11c/0x350
 __ip_queue_xmit+0x36b/0x9d0
 __tcp_transmit_skb+0xb35/0x15c0
 tcp_write_xmit+0x3f1/0x24d0
 tcp_sendmsg_locked+0x8a9/0x1520
 tcp_sendmsg+0x22/0x40
 sock_sendmsg+0x5f/0x70
 __sys_sendto+0x19d/0x250
 __x64_sys_sendto+0x6f/0x80
 do_syscall_64+0x34/0xb0
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff88813cfa4b40
 which belongs to the cache skbuff_fclone_cache of size 472
The buggy address is located 96 bytes inside of
 472-byte region [ffff88813cfa4b40, ffff88813cfa4d18)

The buggy address belongs to the physical page:
page:ffffea0004f3e900 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88813cfa6c40 pfn:0x13cfa4
head:ffffea0004f3e900 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x5fff8000010200(slab|head|node=0|zone=2|lastcpupid=0x3fff)
raw: 005fff8000010200 ffffea0004656b08 ffffea0008e8cf08 ffff8881081a5240
raw: ffff88813cfa6c40 0000000000170015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88813cfa4a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88813cfa4b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
>ffff88813cfa4b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88813cfa4c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88813cfa4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Fixes: 08f7d8b69aaf ("iwlwifi: mvm: bring back mvm GSO code")
Link: https://lore.kernel.org/linux-wireless/20220928193057.16132-1-greearb@candelatech.com/
Tested-by: Amol Jawale <amol.jawale@candelatech.com>
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index f460332333a7..fadaa683a416 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -1215,6 +1215,7 @@ int iwl_mvm_tx_skb_sta(struct iwl_mvm *mvm, struct sk_buff *skb,
 	struct sk_buff_head mpdus_skbs;
 	unsigned int payload_len;
 	int ret;
+	struct sk_buff *orig_skb = skb;
 
 	if (WARN_ON_ONCE(!mvmsta))
 		return -1;
@@ -1247,8 +1248,17 @@ int iwl_mvm_tx_skb_sta(struct iwl_mvm *mvm, struct sk_buff *skb,
 
 		ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
 		if (ret) {
+			/* Free skbs created as part of TSO logic that have not yet been dequeued */
 			__skb_queue_purge(&mpdus_skbs);
-			return ret;
+			/* skb here is not necessarily same as skb that entered this method,
+			 * so free it explicitly.
+			 */
+			if (skb == orig_skb)
+				ieee80211_free_txskb(mvm->hw, skb);
+			else
+				kfree_skb(skb);
+			/* there was error, but we consumed skb one way or another, so return 0 */
+			return 0;
 		}
 	}
 
-- 
2.35.3

[PATCH 3/5] wifi: iwlwifi: mvm: trigger PCI re-enumeration in case of PLDR sync

[gregory.greenman]

From: Avraham Stern <avraham.stern@intel.com>

When doing the PLDR flow, the fw goes through a re-read and needs
PCI re-enumeration in order to recover. In this case, skip the mac
start retry and fw dumps as all the fw and registers are invalid
until the PCI re-enumeration.

In addition, print the register that shows the re-read counter
when loading the fw.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/iwl-prph.h |  1 +
 .../net/wireless/intel/iwlwifi/iwl-trans.h    |  1 +
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c   | 12 ++-
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 10 +++
 drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  2 +
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c  |  3 +
 .../net/wireless/intel/iwlwifi/pcie/trans.c   | 85 ++++++++++---------
 7 files changed, 73 insertions(+), 41 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-prph.h b/drivers/net/wireless/intel/iwlwifi/iwl-prph.h
index 82cf904e0b6d..62ce116d3783 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-prph.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-prph.h
@@ -368,6 +368,7 @@ enum {
 #define CNVR_AUX_MISC_CHIP				0xA2B800
 #define CNVR_SCU_SD_REGS_SD_REG_DIG_DCDC_VTRIM		0xA29890
 #define CNVR_SCU_SD_REGS_SD_REG_ACTIVE_VDIG_MIRROR	0xA29938
+#define CNVI_SCU_SEQ_DATA_DW9				0xA27488
 
 #define PREG_AUX_BUS_WPROT_0		0xA04CC0
 
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
index d659ccd065f7..32bd7f19f1d5 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
@@ -1542,5 +1542,6 @@ void iwl_trans_free(struct iwl_trans *trans);
 ******************************************************/
 int __must_check iwl_pci_register_driver(void);
 void iwl_pci_unregister_driver(void);
+void iwl_trans_pcie_remove(struct iwl_trans *trans, bool rescan);
 
 #endif /* __iwl_trans_h__ */
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index b3101d12a0a1..74354d044db9 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -364,6 +364,8 @@ static int iwl_mvm_load_ucode_wait_alive(struct iwl_mvm *mvm,
 			 iwl_read_umac_prph(mvm->trans, WFPM_LMAC2_PD_NOTIFICATION));
 		IWL_INFO(mvm, "WFPM_AUTH_KEY_0: 0x%x\n",
 			 iwl_read_umac_prph(mvm->trans, SB_MODIFY_CFG_FLAG));
+		IWL_INFO(mvm, "CNVI_SCU_SEQ_DATA_DW9: 0x%x\n",
+			 iwl_read_prph(mvm->trans, CNVI_SCU_SEQ_DATA_DW9));
 	}
 
 	if (ret) {
@@ -402,7 +404,7 @@ static int iwl_mvm_load_ucode_wait_alive(struct iwl_mvm *mvm,
 						UREG_LMAC2_CURRENT_PC));
 		}
 
-		if (ret == -ETIMEDOUT)
+		if (ret == -ETIMEDOUT && !mvm->pldr_sync)
 			iwl_fw_dbg_error_collect(&mvm->fwrt,
 						 FW_DBG_TRIGGER_ALIVE_TIMEOUT);
 
@@ -1479,18 +1481,22 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 		return ret;
 
 	sb_cfg = iwl_read_umac_prph(mvm->trans, SB_MODIFY_CFG_FLAG);
-	if (!(sb_cfg & SB_CFG_RESIDES_IN_OTP_MASK) && iwl_mei_pldr_req())
+	mvm->pldr_sync = !(sb_cfg & SB_CFG_RESIDES_IN_OTP_MASK);
+	if (mvm->pldr_sync && iwl_mei_pldr_req())
 		return ret;
 
 	ret = iwl_mvm_load_rt_fw(mvm);
 	if (ret) {
 		IWL_ERR(mvm, "Failed to start RT ucode: %d\n", ret);
-		if (ret != -ERFKILL)
+		if (ret != -ERFKILL && !mvm->pldr_sync)
 			iwl_fw_dbg_error_collect(&mvm->fwrt,
 						 FW_DBG_TRIGGER_DRIVER);
 		goto error;
 	}
 
+	/* FW loaded successfully */
+	mvm->pldr_sync = false;
+
 	iwl_get_shared_mem_conf(&mvm->fwrt);
 
 	ret = iwl_mvm_sf_update(mvm, NULL, false);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 3fba69554f83..5273ade71117 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -1068,6 +1068,16 @@ static int iwl_mvm_mac_start(struct ieee80211_hw *hw)
 		if (!ret)
 			break;
 
+		/*
+		 * In PLDR sync PCI re-enumeration is needed. no point to retry
+		 * mac start before that.
+		 */
+		if (mvm->pldr_sync) {
+			iwl_mei_alive_notif(false);
+			iwl_trans_pcie_remove(mvm->trans, true);
+			break;
+		}
+
 		IWL_ERR(mvm, "mac start retry %d\n", retry);
 	}
 	clear_bit(IWL_MVM_STATUS_STARTING, &mvm->status);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index 962e304fc2b1..ce6b701f3f4c 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -1105,6 +1105,8 @@ struct iwl_mvm {
 	unsigned long last_reset_or_resume_time_jiffies;
 
 	bool sta_remove_requires_queue_remove;
+
+	bool pldr_sync;
 };
 
 /* Extract MVM priv from op_mode and _hw */
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 2a4db13c9dcf..e78f5beaa2d0 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -1888,6 +1888,9 @@ static void iwl_mvm_nic_error(struct iwl_op_mode *op_mode, bool sync)
 {
 	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 
+	if (mvm->pldr_sync)
+		return;
+
 	if (!test_bit(STATUS_TRANS_DEAD, &mvm->trans->status) &&
 	    !test_and_clear_bit(IWL_MVM_STATUS_SUPPRESS_ERROR_LOG_ONCE,
 				&mvm->status))
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index bd50f52a1aad..0a9af1ad1f20 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -2052,6 +2052,7 @@ static void iwl_trans_pcie_set_pmi(struct iwl_trans *trans, bool state)
 struct iwl_trans_pcie_removal {
 	struct pci_dev *pdev;
 	struct work_struct work;
+	bool rescan;
 };
 
 static void iwl_trans_pcie_removal_wk(struct work_struct *wk)
@@ -2060,18 +2061,61 @@ static void iwl_trans_pcie_removal_wk(struct work_struct *wk)
 		container_of(wk, struct iwl_trans_pcie_removal, work);
 	struct pci_dev *pdev = removal->pdev;
 	static char *prop[] = {"EVENT=INACCESSIBLE", NULL};
+	struct pci_bus *bus = pdev->bus;
 
 	dev_err(&pdev->dev, "Device gone - attempting removal\n");
 	kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, prop);
 	pci_lock_rescan_remove();
 	pci_dev_put(pdev);
 	pci_stop_and_remove_bus_device(pdev);
+	if (removal->rescan)
+		pci_rescan_bus(bus->parent);
 	pci_unlock_rescan_remove();
 
 	kfree(removal);
 	module_put(THIS_MODULE);
 }
 
+void iwl_trans_pcie_remove(struct iwl_trans *trans, bool rescan)
+{
+	struct iwl_trans_pcie_removal *removal;
+
+	if (test_bit(STATUS_TRANS_DEAD, &trans->status))
+		return;
+
+	IWL_ERR(trans, "Device gone - scheduling removal!\n");
+
+	/*
+	 * get a module reference to avoid doing this
+	 * while unloading anyway and to avoid
+	 * scheduling a work with code that's being
+	 * removed.
+	 */
+	if (!try_module_get(THIS_MODULE)) {
+		IWL_ERR(trans,
+			"Module is being unloaded - abort\n");
+		return;
+	}
+
+	removal = kzalloc(sizeof(*removal), GFP_ATOMIC);
+	if (!removal) {
+		module_put(THIS_MODULE);
+		return;
+	}
+	/*
+	 * we don't need to clear this flag, because
+	 * the trans will be freed and reallocated.
+	 */
+	set_bit(STATUS_TRANS_DEAD, &trans->status);
+
+	removal->pdev = to_pci_dev(trans->dev);
+	removal->rescan = rescan;
+	INIT_WORK(&removal->work, iwl_trans_pcie_removal_wk);
+	pci_dev_get(removal->pdev);
+	schedule_work(&removal->work);
+}
+EXPORT_SYMBOL(iwl_trans_pcie_remove);
+
 /*
  * This version doesn't disable BHs but rather assumes they're
  * already disabled.
@@ -2131,47 +2175,12 @@ bool __iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans)
 
 		iwl_trans_pcie_dump_regs(trans);
 
-		if (iwlwifi_mod_params.remove_when_gone && cntrl == ~0U) {
-			struct iwl_trans_pcie_removal *removal;
-
-			if (test_bit(STATUS_TRANS_DEAD, &trans->status))
-				goto err;
-
-			IWL_ERR(trans, "Device gone - scheduling removal!\n");
-
-			/*
-			 * get a module reference to avoid doing this
-			 * while unloading anyway and to avoid
-			 * scheduling a work with code that's being
-			 * removed.
-			 */
-			if (!try_module_get(THIS_MODULE)) {
-				IWL_ERR(trans,
-					"Module is being unloaded - abort\n");
-				goto err;
-			}
-
-			removal = kzalloc(sizeof(*removal), GFP_ATOMIC);
-			if (!removal) {
-				module_put(THIS_MODULE);
-				goto err;
-			}
-			/*
-			 * we don't need to clear this flag, because
-			 * the trans will be freed and reallocated.
-			*/
-			set_bit(STATUS_TRANS_DEAD, &trans->status);
-
-			removal->pdev = to_pci_dev(trans->dev);
-			INIT_WORK(&removal->work, iwl_trans_pcie_removal_wk);
-			pci_dev_get(removal->pdev);
-			schedule_work(&removal->work);
-		} else {
+		if (iwlwifi_mod_params.remove_when_gone && cntrl == ~0U)
+			iwl_trans_pcie_remove(trans, false);
+		else
 			iwl_write32(trans, CSR_RESET,
 				    CSR_RESET_REG_FLAG_FORCE_NMI);
-		}
 
-err:
 		spin_unlock(&trans_pcie->reg_lock);
 		return false;
 	}
-- 
2.35.3

[PATCH 4/5] wifi: iwlwifi: mvm: return error value in case PLDR sync failed

[gregory.greenman]

From: Avraham Stern <avraham.stern@intel.com>

In case PLDR sync is required but iwlmei failed to get a response
from CSME, the device cannot be brought up, so return an error
value.

Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/all/Y3uYUEFnMiBY2ABQ@kili/
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 74354d044db9..2f4c9e653e99 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -1483,7 +1483,7 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 	sb_cfg = iwl_read_umac_prph(mvm->trans, SB_MODIFY_CFG_FLAG);
 	mvm->pldr_sync = !(sb_cfg & SB_CFG_RESIDES_IN_OTP_MASK);
 	if (mvm->pldr_sync && iwl_mei_pldr_req())
-		return ret;
+		return -EBUSY;
 
 	ret = iwl_mvm_load_rt_fw(mvm);
 	if (ret) {
-- 
2.35.3

[PATCH 5/5] wifi: iwlwifi: mei: fix parameter passing to iwl_mei_alive_notif()

[gregory.greenman]

From: Gregory Greenman <gregory.greenman@intel.com>

Pass true explicitly to iwl_mei_alive_notif() when we can be
sure that Alive notification was received. The issue was discovered
by Smatch.

Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/all/Y3uYUEFnMiBY2ABQ@kili/
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 2f4c9e653e99..0a41cd0ab243 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -418,7 +418,8 @@ static int iwl_mvm_load_ucode_wait_alive(struct iwl_mvm *mvm,
 		return -EIO;
 	}
 
-	iwl_mei_alive_notif(!ret);
+	/* if reached this point, Alive notification was received */
+	iwl_mei_alive_notif(true);
 
 	ret = iwl_pnvm_load(mvm->trans, &mvm->notif_wait);
 	if (ret) {
-- 
2.35.3