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Date: Fri, 20 Oct 2017 15:15:08 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Ingo Molnar <mingo@...nel.org>,
Arvind Yadav <arvind.yadav.cs@...il.com>,
Quentin Lambert <lambert.quentin@...il.com>,
Aleksandr Bezzubikov <zuban32s@...il.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Marcel Apfelbaum <marcel@...hat.com>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI Hotplug: Convert timers to use timer_setup()
On Mon, Oct 16, 2017 at 04:18:02PM -0700, Kees Cook wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly. This has the result of fixing
> pushbutton_helper_thread which was truncating the event pointer to 32 bits.
>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Arvind Yadav <arvind.yadav.cs@...il.com>
> Cc: Quentin Lambert <lambert.quentin@...il.com>
> Cc: Aleksandr Bezzubikov <zuban32s@...il.com>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Marcel Apfelbaum <marcel@...hat.com>
> Cc: linux-pci@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
Applied to pci/hotplug for v4.15, thanks!
I did split this into two parts (cpqphp and shpchp) so it matches the
previous pciehp one.
> ---
> drivers/pci/hotplug/cpqphp.h | 2 +-
> drivers/pci/hotplug/cpqphp_core.c | 3 +--
> drivers/pci/hotplug/cpqphp_ctrl.c | 19 ++++++++++---------
> drivers/pci/hotplug/shpchp_hpc.c | 9 +++------
> 4 files changed, 15 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/pci/hotplug/cpqphp.h b/drivers/pci/hotplug/cpqphp.h
> index 48c8a066a6b7..c2bbe6b65d06 100644
> --- a/drivers/pci/hotplug/cpqphp.h
> +++ b/drivers/pci/hotplug/cpqphp.h
> @@ -410,7 +410,7 @@ void cpqhp_create_debugfs_files(struct controller *ctrl);
> void cpqhp_remove_debugfs_files(struct controller *ctrl);
>
> /* controller functions */
> -void cpqhp_pushbutton_thread(unsigned long event_pointer);
> +void cpqhp_pushbutton_thread(struct timer_list *t);
> irqreturn_t cpqhp_ctrl_intr(int IRQ, void *data);
> int cpqhp_find_available_resources(struct controller *ctrl,
> void __iomem *rom_start);
> diff --git a/drivers/pci/hotplug/cpqphp_core.c b/drivers/pci/hotplug/cpqphp_core.c
> index 4d06b8461255..70967ac75265 100644
> --- a/drivers/pci/hotplug/cpqphp_core.c
> +++ b/drivers/pci/hotplug/cpqphp_core.c
> @@ -661,9 +661,8 @@ static int ctrl_slot_setup(struct controller *ctrl,
>
> slot->p_sm_slot = slot_entry;
>
> - init_timer(&slot->task_event);
> + timer_setup(&slot->task_event, cpqhp_pushbutton_thread, 0);
> slot->task_event.expires = jiffies + 5 * HZ;
> - slot->task_event.function = cpqhp_pushbutton_thread;
>
> /*FIXME: these capabilities aren't used but if they are
> * they need to be correctly implemented
> diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c
> index a55653b54eed..a93069e739cb 100644
> --- a/drivers/pci/hotplug/cpqphp_ctrl.c
> +++ b/drivers/pci/hotplug/cpqphp_ctrl.c
> @@ -47,7 +47,7 @@ static void interrupt_event_handler(struct controller *ctrl);
>
>
> static struct task_struct *cpqhp_event_thread;
> -static unsigned long pushbutton_pending; /* = 0 */
> +static struct timer_list *pushbutton_pending; /* = NULL */
>
> /* delay is in jiffies to wait for */
> static void long_delay(int delay)
> @@ -1732,9 +1732,10 @@ static u32 remove_board(struct pci_func *func, u32 replace_flag, struct controll
> return 0;
> }
>
> -static void pushbutton_helper_thread(unsigned long data)
> +static void pushbutton_helper_thread(struct timer_list *t)
> {
> - pushbutton_pending = data;
> + pushbutton_pending = t;
> +
> wake_up_process(cpqhp_event_thread);
> }
>
> @@ -1883,13 +1884,13 @@ static void interrupt_event_handler(struct controller *ctrl)
> wait_for_ctrl_irq(ctrl);
>
> mutex_unlock(&ctrl->crit_sect);
> - init_timer(&p_slot->task_event);
> + timer_setup(&p_slot->task_event,
> + pushbutton_helper_thread,
> + 0);
> p_slot->hp_slot = hp_slot;
> p_slot->ctrl = ctrl;
> /* p_slot->physical_slot = physical_slot; */
> p_slot->task_event.expires = jiffies + 5 * HZ; /* 5 second delay */
> - p_slot->task_event.function = pushbutton_helper_thread;
> - p_slot->task_event.data = (u32) p_slot;
>
> dbg("add_timer p_slot = %p\n", p_slot);
> add_timer(&p_slot->task_event);
> @@ -1920,15 +1921,15 @@ static void interrupt_event_handler(struct controller *ctrl)
> * Scheduled procedure to handle blocking stuff for the pushbuttons.
> * Handles all pending events and exits.
> */
> -void cpqhp_pushbutton_thread(unsigned long slot)
> +void cpqhp_pushbutton_thread(struct timer_list *t)
> {
> u8 hp_slot;
> u8 device;
> struct pci_func *func;
> - struct slot *p_slot = (struct slot *) slot;
> + struct slot *p_slot = from_timer(p_slot, t, task_event);
> struct controller *ctrl = (struct controller *) p_slot->ctrl;
>
> - pushbutton_pending = 0;
> + pushbutton_pending = NULL;
> hp_slot = p_slot->hp_slot;
>
> device = p_slot->device;
> diff --git a/drivers/pci/hotplug/shpchp_hpc.c b/drivers/pci/hotplug/shpchp_hpc.c
> index e5824c7b7b6b..4810e9626d9f 100644
> --- a/drivers/pci/hotplug/shpchp_hpc.c
> +++ b/drivers/pci/hotplug/shpchp_hpc.c
> @@ -229,14 +229,13 @@ static inline int shpc_indirect_read(struct controller *ctrl, int index,
> /*
> * This is the interrupt polling timeout function.
> */
> -static void int_poll_timeout(unsigned long data)
> +static void int_poll_timeout(struct timer_list *t)
> {
> - struct controller *ctrl = (struct controller *)data;
> + struct controller *ctrl = from_timer(ctrl, t, poll_timer);
>
> /* Poll for interrupt events. regs == NULL => polling */
> shpc_isr(0, ctrl);
>
> - init_timer(&ctrl->poll_timer);
> if (!shpchp_poll_time)
> shpchp_poll_time = 2; /* default polling interval is 2 sec */
>
> @@ -252,8 +251,6 @@ static void start_int_poll_timer(struct controller *ctrl, int sec)
> if ((sec <= 0) || (sec > 60))
> sec = 2;
>
> - ctrl->poll_timer.function = &int_poll_timeout;
> - ctrl->poll_timer.data = (unsigned long)ctrl;
> ctrl->poll_timer.expires = jiffies + sec * HZ;
> add_timer(&ctrl->poll_timer);
> }
> @@ -1054,7 +1051,7 @@ int shpc_init(struct controller *ctrl, struct pci_dev *pdev)
>
> if (shpchp_poll_mode) {
> /* Install interrupt polling timer. Start with 10 sec delay */
> - init_timer(&ctrl->poll_timer);
> + timer_setup(&ctrl->poll_timer, int_poll_timeout, 0);
> start_int_poll_timer(ctrl, 10);
> } else {
> /* Installs the interrupt handler */
> --
> 2.7.4
>
>
> --
> Kees Cook
> Pixel Security
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