From: Keith Busch <keith.busch@intel.com>
Date: Thu, 24 May 2018 16:16:04 -0600
Subject: [PATCH] nvme-pci: Fix AER reset handling
Git-commit: 72cd4cc28e234ed7189ee508ed65ab60c80a97c8
Patch-mainline: v4.18-rc1
References: bsc#1104967,FATE#325924
The nvme timeout handling doesn't do anything if the pci channel is
offline, which is the case when recovering from PCI error event, so it
was a bad idea to sync the controller reset in this state. This patch
flushes the reset work in the error_resume callback instead when the
channel is back to online. This keeps AER handling serialized and
can recover from timeouts.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=199757
Fixes: cc1d5e749a2e ("nvme/pci: Sync controller reset for AER slot_reset")
Reported-by: Alex Gagniuc <mr.nuke.me@gmail.com>
Tested-by: Alex Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/nvme/host/pci.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 41880cb9e502..79b48052ea11 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2706,19 +2706,15 @@ static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev)
dev_info(dev->ctrl.device, "restart after slot reset\n");
pci_restore_state(pdev);
- nvme_reset_ctrl_sync(&dev->ctrl);
-
- switch (dev->ctrl.state) {
- case NVME_CTRL_LIVE:
- case NVME_CTRL_ADMIN_ONLY:
- return PCI_ERS_RESULT_RECOVERED;
- default:
- return PCI_ERS_RESULT_DISCONNECT;
- }
+ nvme_reset_ctrl(&dev->ctrl);
+ return PCI_ERS_RESULT_RECOVERED;
}
static void nvme_error_resume(struct pci_dev *pdev)
{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+
+ flush_work(&dev->ctrl.reset_work);
pci_cleanup_aer_uncorrect_error_status(pdev);
}
--
2.12.3