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PCI/pwrctl: Rescan bus on a separate thread

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If we trigger the bus rescan from sysfs, we'll try to lock the PCI rescan
mutex recursively and deadlock - the platform device will be populated and
probed on the same thread that handles the sysfs write.

Add a workqueue to the pwrctl code on which we schedule the rescan for
controlled PCI devices. While at it: add a new interface for initializing
the pwrctl context where we'd now assign the parent device address and
initialize the workqueue.

Link: https://lore.kernel.org/r/20240823093323.33450-3-brgl@bgdev.pl
Fixes: 4565d2652a ("PCI/pwrctl: Add PCI power control core code")
Reported-by: Konrad Dybcio <konradybcio@kernel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Bartosz Golaszewski
2024-08-23 11:33:23 +02:00
committed by Bjorn Helgaas
parent f153658558
commit 8f62819aaa
3 changed files with 27 additions and 4 deletions
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3
include/linux/pci-pwrctl.h
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@@ -7,6 +7,7 @@
#define __PCI_PWRCTL_H__
#include <linux/notifier.h>
#include <linux/workqueue.h>
struct device;
struct device_link;
@@ -41,8 +42,10 @@ struct pci_pwrctl {
/* Private: don't use. */
struct notifier_block nb;
struct device_link *link;
struct work_struct work;
};
void pci_pwrctl_init(struct pci_pwrctl *pwrctl, struct device *dev);
int pci_pwrctl_device_set_ready(struct pci_pwrctl *pwrctl);
void pci_pwrctl_device_unset_ready(struct pci_pwrctl *pwrctl);
int devm_pci_pwrctl_device_set_ready(struct device *dev,