I'd like to do shutdowns asynchronously so I can shutdown multiple
devices in parallel, but the pci-driver disables interrupts after my
driver returns from its '.shutdown', though it needs to rely on these
interrupts in its asynchronously scheduled shutdown.
I tracked the reason for pci disabling msi to ...
| commit d52877c7b1afb8c37ebe17e2005040b79cb618b0
| Author: Yinghai Lu <yhlu.kernel.send@xxxxxxxxx>
| Date: Wed Apr 23 14:58:09 2008 -0700
|
| pci/irq: let pci_device_shutdown to call pci_msi_shutdown v2
... because mptfusion doesn't disable msi in its shutdown path.
Any reason we can't let the drivers do this instead?
To provide context why I want to do this asynchronously, NVM-Express has
one PCI device per controller, of which there could be dozens in a system,
and each one may take many seconds (I've heard over ten in some cases)
to safely shutdown.
In this patch, mptfusion was compile tested only; I didn't observe any
adverse affects from running the pci portion.
Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Nagalakshmi Nandigama <Nagalakshmi.Nandigama@xxxxxxx>
Cc: Sreekanth Reddy <Sreekanth.Reddy@xxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/message/fusion/mptscsih.c | 3 +++
drivers/pci/pci-driver.c | 2 --
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 2a1c6f2..3186e17 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -1215,6 +1215,9 @@ mptscsih_remove(struct pci_dev *pdev)
void
mptscsih_shutdown(struct pci_dev *pdev)
{
+ MPT_ADAPTER *ioc = pci_get_drvdata(pdev);
+ if (ioc->msi_enable)
+ pci_disable_msi(pdev);
}
#ifdef CONFIG_PM
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 3f8e3db..8079d98 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -453,8 +453,6 @@ static void pci_device_shutdown(struct device *dev)
if (drv && drv->shutdown)
drv->shutdown(pci_dev);
- pci_msi_shutdown(pci_dev);
- pci_msix_shutdown(pci_dev);
#ifdef CONFIG_KEXEC
/*
--
1.7.10.4
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