PCI: pciehp: Make pcie_wait_cmd() self-contained
pcie_wait_cmd() waits for the controller to finish a hotplug command. Move
the associated logic (to determine whether waiting is required and whether
we're using interrupts or polling) from pcie_write_cmd() to
pcie_wait_cmd().
No functional change.
Tested-by: Rajat Jain <rajatxjain@gmail.com> (IDT 807a controller)
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 42914e0..7c2a9dd 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -129,16 +129,27 @@
return 0; /* timeout */
}
-static void pcie_wait_cmd(struct controller *ctrl, int poll)
+static void pcie_wait_cmd(struct controller *ctrl)
{
unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
unsigned long timeout = msecs_to_jiffies(msecs);
int rc;
- if (poll)
- rc = pcie_poll_cmd(ctrl);
- else
+ /*
+ * If the controller does not generate notifications for command
+ * completions, we never need to wait between writes.
+ */
+ if (ctrl->no_cmd_complete)
+ return;
+
+ if (!ctrl->cmd_busy)
+ return;
+
+ if (ctrl->slot_ctrl & PCI_EXP_SLTCTL_HPIE &&
+ ctrl->slot_ctrl & PCI_EXP_SLTCTL_CCIE)
rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout);
+ else
+ rc = pcie_poll_cmd(ctrl);
if (!rc)
ctrl_dbg(ctrl, "Command not completed in 1000 msec\n");
}
@@ -187,22 +198,12 @@
ctrl->cmd_busy = 1;
smp_mb();
pcie_capability_write_word(pdev, PCI_EXP_SLTCTL, slot_ctrl);
+ ctrl->slot_ctrl = slot_ctrl;
/*
* Wait for command completion.
*/
- if (!ctrl->no_cmd_complete) {
- int poll = 0;
- /*
- * if hotplug interrupt is not enabled or command
- * completed interrupt is not enabled, we need to poll
- * command completed event.
- */
- if (!(slot_ctrl & PCI_EXP_SLTCTL_HPIE) ||
- !(slot_ctrl & PCI_EXP_SLTCTL_CCIE))
- poll = 1;
- pcie_wait_cmd(ctrl, poll);
- }
+ pcie_wait_cmd(ctrl);
mutex_unlock(&ctrl->ctrl_lock);
}