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However, the work structures > (zynqmp_pm_init_suspend_work and zynqmp_pm_init_restart_work) used by > these handlers were allocated and initialized after the registration > call. > > This created a race window where, if the firmware triggered an event > immediately after registration but before allocation, the callback > (suspend_event_callback or subsystem_restart_event_callback) would > dereference a NULL pointer in work_pending(), leading to a crash. > > Fix this by allocating and initializing the work structures before > registering the events. > > Fixes: fcf544ac6439 ("soc: xilinx: Add cb event for subsystem restart") > Signed-off-by: Prasanna Kumar T S M > --- > drivers/soc/xilinx/zynqmp_power.c | 43 ++++++++++++------------------- > 1 file changed, 17 insertions(+), 26 deletions(-) > > diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c > index 9085db1b480a..9dd938bd01d8 100644 > --- a/drivers/soc/xilinx/zynqmp_power.c > +++ b/drivers/soc/xilinx/zynqmp_power.c > @@ -303,18 +303,18 @@ static int zynqmp_pm_probe(struct platform_device *pdev) > * is not available to use) or -ENODEV(Xilinx Event Manager not compiled), > * then use ipi-mailbox or interrupt method. > */ > + zynqmp_pm_init_suspend_work = devm_kzalloc(&pdev->dev, > + sizeof(struct zynqmp_pm_work_struct), > + GFP_KERNEL); > + if (!zynqmp_pm_init_suspend_work) > + return -ENOMEM; > + > + INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work, > + zynqmp_pm_init_suspend_work_fn); > + > ret = register_event(&pdev->dev, PM_INIT_SUSPEND_CB, 0, 0, false, > suspend_event_callback); > if (!ret) { > - zynqmp_pm_init_suspend_work = devm_kzalloc(&pdev->dev, > - sizeof(struct zynqmp_pm_work_struct), > - GFP_KERNEL); > - if (!zynqmp_pm_init_suspend_work) > - return -ENOMEM; > - > - INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work, > - zynqmp_pm_init_suspend_work_fn); > - > ret = zynqmp_pm_get_family_info(&pm_family_code); > if (ret < 0) > return ret; > @@ -326,14 +326,6 @@ static int zynqmp_pm_probe(struct platform_device *pdev) > else > return -ENODEV; > > - ret = register_event(&pdev->dev, PM_NOTIFY_CB, node_id, EVENT_SUBSYSTEM_RESTART, > - false, subsystem_restart_event_callback); > - if (ret) { > - dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", > - ret); > - return ret; > - } > - > zynqmp_pm_init_restart_work = devm_kzalloc(&pdev->dev, > sizeof(struct zynqmp_pm_work_struct), > GFP_KERNEL); > @@ -342,19 +334,18 @@ static int zynqmp_pm_probe(struct platform_device *pdev) > > INIT_WORK(&zynqmp_pm_init_restart_work->callback_work, > zynqmp_pm_subsystem_restart_work_fn); > + > + ret = register_event(&pdev->dev, PM_NOTIFY_CB, node_id, EVENT_SUBSYSTEM_RESTART, > + false, subsystem_restart_event_callback); > + if (ret) { > + dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", > + ret); > + return ret; > + } > } else if (ret != -EACCES && ret != -ENODEV) { > dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", ret); > return ret; > } else if (of_property_present(pdev->dev.of_node, "mboxes")) { > - zynqmp_pm_init_suspend_work = > - devm_kzalloc(&pdev->dev, > - sizeof(struct zynqmp_pm_work_struct), > - GFP_KERNEL); > - if (!zynqmp_pm_init_suspend_work) > - return -ENOMEM; > - > - INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work, > - zynqmp_pm_init_suspend_work_fn); > client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL); > if (!client) > return -ENOMEM; Applied both. Thanks, Michal