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PCI: pciehp: Convert to threaded polling

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We've just converted pciehp to threaded IRQ handling, but still cannot
sleep in pciehp_ist() because the function is also called in poll mode,
which runs in softirq context (from a timer).

Convert poll mode to a kthread so that pciehp_ist() always runs in task
context.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Lukas Wunner
2018-07-19 17:27:39 -05:00
committed by Bjorn Helgaas
parent 7b4ce26bcf
commit ec07a44730
2 changed files with 34 additions and 37 deletions
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4
drivers/pci/hotplug/pciehp.h
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@@ -97,7 +97,7 @@ struct event_info {
* used for synchronous writes to the Slot Control register
* @slot_cap: cached copy of the Slot Capabilities register
* @slot_ctrl: cached copy of the Slot Control register
* @poll_timer: timer to poll for slot events if no IRQ is available,
* @poll_thread: thread to poll for slot events if no IRQ is available,
* enabled with pciehp_poll_mode module parameter
* @cmd_started: jiffies when the Slot Control register was last written;
* the next write is allowed 1 second later, absent a Command Completed
@@ -122,7 +122,7 @@ struct controller {
wait_queue_head_t queue;
u32 slot_cap;
u16 slot_ctrl;
struct timer_list poll_timer;
struct task_struct *poll_thread;
unsigned long cmd_started; /* jiffies */
unsigned int cmd_busy:1;
unsigned int link_active_reporting:1;