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Subject[PATCH 4.19 19/47] PCI: pciehp: Avoid returning prematurely from sysfs requests
Date
From: Lukas Wunner <lukas@wunner.de>

commit 157c1062fcd86ade3c674503705033051fd3d401 upstream.

A sysfs request to enable or disable a PCIe hotplug slot should not
return before it has been carried out. That is sought to be achieved by
waiting until the controller's "pending_events" have been cleared.

However the IRQ thread pciehp_ist() clears the "pending_events" before
it acts on them. If pciehp_sysfs_enable_slot() / _disable_slot() happen
to check the "pending_events" after they have been cleared but while
pciehp_ist() is still running, the functions may return prematurely
with an incorrect return value.

Fix by introducing an "ist_running" flag which must be false before a sysfs
request is allowed to return.

Fixes: 32a8cef274fe ("PCI: pciehp: Enable/disable exclusively from IRQ thread")
Link: https://lore.kernel.org/linux-pci/1562226638-54134-1-git-send-email-wangxiongfeng2@huawei.com
Link: https://lore.kernel.org/r/4174210466e27eb7e2243dd1d801d5f75baaffd8.1565345211.git.lukas@wunner.de
Reported-and-tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/pci/hotplug/pciehp.h | 2 ++
drivers/pci/hotplug/pciehp_ctrl.c | 6 ++++--
drivers/pci/hotplug/pciehp_hpc.c | 2 ++
3 files changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -106,6 +106,7 @@ struct slot {
* that has not yet been cleared by the user
* @pending_events: used by the IRQ handler to save events retrieved from the
* Slot Status register for later consumption by the IRQ thread
+ * @ist_running: flag to keep user request waiting while IRQ thread is running
* @request_result: result of last user request submitted to the IRQ thread
* @requester: wait queue to wake up on completion of user request,
* used for synchronous slot enable/disable request via sysfs
@@ -125,6 +126,7 @@ struct controller {
unsigned int notification_enabled:1;
unsigned int power_fault_detected;
atomic_t pending_events;
+ unsigned int ist_running;
int request_result;
wait_queue_head_t requester;
};
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -383,7 +383,8 @@ int pciehp_sysfs_enable_slot(struct slot
ctrl->request_result = -ENODEV;
pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
wait_event(ctrl->requester,
- !atomic_read(&ctrl->pending_events));
+ !atomic_read(&ctrl->pending_events) &&
+ !ctrl->ist_running);
return ctrl->request_result;
case POWERON_STATE:
ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
@@ -416,7 +417,8 @@ int pciehp_sysfs_disable_slot(struct slo
mutex_unlock(&p_slot->lock);
pciehp_request(ctrl, DISABLE_SLOT);
wait_event(ctrl->requester,
- !atomic_read(&ctrl->pending_events));
+ !atomic_read(&ctrl->pending_events) &&
+ !ctrl->ist_running);
return ctrl->request_result;
case POWEROFF_STATE:
ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -620,6 +620,7 @@ static irqreturn_t pciehp_ist(int irq, v
irqreturn_t ret;
u32 events;

+ ctrl->ist_running = true;
pci_config_pm_runtime_get(pdev);

/* rerun pciehp_isr() if the port was inaccessible on interrupt */
@@ -666,6 +667,7 @@ static irqreturn_t pciehp_ist(int irq, v
up_read(&ctrl->reset_lock);

pci_config_pm_runtime_put(pdev);
+ ctrl->ist_running = false;
wake_up(&ctrl->requester);
return IRQ_HANDLED;
}

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