Use down_read_nested() and down_write_nested() when taking the
ctrl->reset_lock rw-sem, passing the PCI-device depth in the hierarchy
as lock subclass parameter. This fixes the following false-positive lockdep
report when unplugging a Lenovo X1C8 from a Lenovo 2nd gen TB3 dock:
[ 28.583853] pcieport 0000:06:01.0: pciehp: Slot(1): Link Down
[ 28.583891] pcieport 0000:06:01.0: pciehp: Slot(1): Card not present
[ 28.583995] pcieport 0000:09:04.0: can't change power state from D3cold to D0 (config space inaccessible)
[ 28.584849] ============================================
[ 28.584854] WARNING: possible recursive locking detected
[ 28.584858] 5.16.0-rc2+ #621 Not tainted
[ 28.584864] --------------------------------------------
[ 28.584867] irq/124-pciehp/86 is trying to acquire lock:
[ 28.584873] ffff8e5ac4299ef8 (&ctrl->reset_lock){.+.+}-{3:3}, at: pciehp_check_presence+0x23/0x80
[ 28.584904]
but task is already holding lock:
[ 28.584908] ffff8e5ac4298af8 (&ctrl->reset_lock){.+.+}-{3:3}, at: pciehp_ist+0xf3/0x180
[ 28.584929]
other info that might help us debug this:
[ 28.584933] Possible unsafe locking scenario:
[ 28.584936] CPU0
[ 28.584939] ----
[ 28.584942] lock(&ctrl->reset_lock);
[ 28.584949] lock(&ctrl->reset_lock);
[ 28.584955]
*** DEADLOCK ***
[ 28.584959] May be due to missing lock nesting notation
[ 28.584963] 3 locks held by irq/124-pciehp/86:
[ 28.584970] #0: ffff8e5ac4298af8 (&ctrl->reset_lock){.+.+}-{3:3}, at: pciehp_ist+0xf3/0x180
[ 28.584991] #1: ffffffffa3b024e8 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pciehp_unconfigure_device+0x31/0x110
[ 28.585012] #2: ffff8e5ac1ee2248 (&dev->mutex){....}-{3:3}, at: device_release_driver+0x1c/0x40
[ 28.585037]
stack backtrace:
[ 28.585042] CPU: 4 PID: 86 Comm: irq/124-pciehp Not tainted 5.16.0-rc2+ #621
[ 28.585052] Hardware name: LENOVO 20U90SIT19/20U90SIT19, BIOS N2WET30W (1.20 ) 08/26/2021
[ 28.585059] Call Trace:
[ 28.585064] <TASK>
[ 28.585073] dump_stack_lvl+0x59/0x73
[ 28.585087] __lock_acquire.cold+0xc5/0x2c6
[ 28.585106] ? find_held_lock+0x2b/0x80
[ 28.585124] lock_acquire+0xb5/0x2b0
[ 28.585132] ? pciehp_check_presence+0x23/0x80
[ 28.585144] ? lock_is_held_type+0xa8/0x120
[ 28.585161] down_read+0x3e/0x50
[ 28.585172] ? pciehp_check_presence+0x23/0x80
[ 28.585183] pciehp_check_presence+0x23/0x80
[ 28.585194] pciehp_runtime_resume+0x5c/0xa0
[ 28.585206] ? pci_msix_init+0x60/0x60
[ 28.585214] device_for_each_child+0x45/0x70
[ 28.585227] pcie_port_device_runtime_resume+0x20/0x30
[ 28.585236] pci_pm_runtime_resume+0xa7/0xc0
[ 28.585246] ? pci_pm_freeze_noirq+0x100/0x100
[ 28.585257] __rpm_callback+0x41/0x110
[ 28.585271] ? pci_pm_freeze_noirq+0x100/0x100
[ 28.585281] rpm_callback+0x59/0x70
[ 28.585293] rpm_resume+0x512/0x7b0
[ 28.585309] __pm_runtime_resume+0x4a/0x90
[ 28.585322] __device_release_driver+0x28/0x240
[ 28.585338] device_release_driver+0x26/0x40
[ 28.585351] pci_stop_bus_device+0x68/0x90
[ 28.585363] pci_stop_bus_device+0x2c/0x90
[ 28.585373] pci_stop_and_remove_bus_device+0xe/0x20
[ 28.585384] pciehp_unconfigure_device+0x6c/0x110
[ 28.585396] ? __pm_runtime_resume+0x58/0x90
[ 28.585409] pciehp_disable_slot+0x5b/0xe0
[ 28.585421] pciehp_handle_presence_or_link_change+0xc3/0x2f0
[ 28.585436] pciehp_ist+0x179/0x180
[ 28.585449] ? disable_irq_nosync+0x10/0x10
[ 28.585460] irq_thread_fn+0x1d/0x60
[ 28.585470] ? irq_thread+0x81/0x1a0
[ 28.585480] irq_thread+0xcb/0x1a0
[ 28.585491] ? irq_thread_fn+0x60/0x60
[ 28.585502] ? irq_thread_check_affinity+0xb0/0xb0
[ 28.585514] kthread+0x165/0x190
[ 28.585522] ? set_kthread_struct+0x40/0x40
[ 28.585531] ret_from_fork+0x1f/0x30
[ 28.585554] </TASK>
[ 28.586512] xhci_hcd 0000:0a:00.0: remove, state 1
[ 28.586538] usb usb4: USB disconnect, device number 1
[ 28.586547] usb 4-2: USB disconnect, device number 2
[ 28.586555] usb 4-2.1: USB disconnect, device number 3
[ 28.586561] usb 4-2.1.2: USB disconnect, device number 5
[ 28.587709] xhci_hcd 0000:0a:00.0: xHCI host controller not responding, assume dead
[ 28.590021] usb 4-2.3: USB disconnect, device number 4
[ 28.613814] xhci_hcd 0000:0a:00.0: WARN Can't disable streams for endpoint 0x1, streams are being disabled already
[ 28.616865] xhci_hcd 0000:0a:00.0: USB bus 4 deregistered
[ 28.617082] xhci_hcd 0000:0a:00.0: remove, state 1
[ 28.617089] usb usb3: USB disconnect, device number 1
[ 28.617092] usb 3-2: USB disconnect, device number 2
[ 28.617094] usb 3-2.1: USB disconnect, device number 3
[ 28.617096] usb 3-2.1.1: USB disconnect, device number 6
[ 28.617098] usb 3-2.1.1.4: USB disconnect, device number 8
[ 28.645354] usb 3-2.1.3: USB disconnect, device number 7
[ 28.645357] usb 3-2.1.3.1: USB disconnect, device number 10
[ 28.647489] usb 3-2.1.3.4: USB disconnect, device number 11
[ 28.647494] usb 3-2.1.3.4.1: USB disconnect, device number 13
[ 28.760411] usb 3-2.1.4: USB disconnect, device number 9
[ 28.760414] usb 3-2.1.4.1: USB disconnect, device number 12
[ 28.795513] usb 3-2.4: USB disconnect, device number 4
[ 28.821464] usb 3-2.5: USB disconnect, device number 5
[ 28.822850] xhci_hcd 0000:0a:00.0: Host halt failed, -19
[ 28.822854] xhci_hcd 0000:0a:00.0: Host not accessible, reset failed.
[ 28.823331] xhci_hcd 0000:0a:00.0: USB bus 3 deregistered
[ 28.823589] pci 0000:0a:00.0: Removing from iommu group 15
[ 28.823605] pci_bus 0000:0a: busn_res: [bus 0a] is released
[ 28.823660] pci 0000:09:02.0: Removing from iommu group 15
[ 28.823729] pci_bus 0000:0b: busn_res: [bus 0b-2c] is released
[ 28.823773] pci 0000:09:04.0: Removing from iommu group 15
[ 28.823782] pci_bus 0000:09: busn_res: [bus 09-2c] is released
[ 28.823851] pci 0000:08:00.0: Removing from iommu group 15
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/pci/hotplug/pciehp.h | 1 +
drivers/pci/hotplug/pciehp_core.c | 2 +-
drivers/pci/hotplug/pciehp_hpc.c | 7 ++++---
3 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 918dccbc74b6..7de17f32bf8c 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -106,6 +106,7 @@ struct controller {
struct hotplug_slot hotplug_slot; /* hotplug core interface */
struct rw_semaphore reset_lock;
+ unsigned int depth;
unsigned int ist_running;
int request_result;
wait_queue_head_t requester;
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index f34114d45259..4042d87d539d 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -166,7 +166,7 @@ static void pciehp_check_presence(struct controller *ctrl)
{
int occupied;
- down_read(&ctrl->reset_lock);
+ down_read_nested(&ctrl->reset_lock, ctrl->depth);
mutex_lock(&ctrl->state_lock);
occupied = pciehp_card_present_or_link_active(ctrl);
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 83a0fa119cae..54643a95baad 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -583,7 +583,7 @@ static void pciehp_ignore_dpc_link_change(struct controller *ctrl,
* the corresponding link change may have been ignored above.
* Synthesize it to ensure that it is acted on.
*/
- down_read(&ctrl->reset_lock);
+ down_read_nested(&ctrl->reset_lock, ctrl->depth);
if (!pciehp_check_link_active(ctrl))
pciehp_request(ctrl, PCI_EXP_SLTSTA_DLLSC);
up_read(&ctrl->reset_lock);
@@ -746,7 +746,7 @@ static irqreturn_t pciehp_ist(int irq, void *dev_id)
* Disable requests have higher priority than Presence Detect Changed
* or Data Link Layer State Changed events.
*/
- down_read(&ctrl->reset_lock);
+ down_read_nested(&ctrl->reset_lock, ctrl->depth);
if (events & DISABLE_SLOT)
pciehp_handle_disable_request(ctrl);
else if (events & (PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC))
@@ -906,7 +906,7 @@ int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, bool probe)
if (probe)
return 0;
- down_write(&ctrl->reset_lock);
+ down_write_nested(&ctrl->reset_lock, ctrl->depth);
if (!ATTN_BUTTN(ctrl)) {
ctrl_mask |= PCI_EXP_SLTCTL_PDCE;
@@ -975,6 +975,7 @@ struct controller *pcie_init(struct pcie_device *dev)
return NULL;
ctrl->pcie = dev;
+ ctrl->depth = pci_dev_depth(dev->port);
pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap);
if (pdev->hotplug_user_indicators)
--
2.33.1
