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Message-ID: <20171016231802.GA100237@beast>
Date: Mon, 16 Oct 2017 16:18:02 -0700
From: Kees Cook <keescook@...omium.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: 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: [PATCH] PCI Hotplug: Convert timers to use timer_setup()
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>
---
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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