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nvme-pci: Fix AER reset handling 

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: cc1d5e749a ("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>
zero-colors
Keith Busch 2018-05-24 16:16:04 -06:00 committed by Christoph Hellwig
parent a8e3e0bb74
commit 72cd4cc28e
1 changed files with 5 additions and 9 deletions
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14
drivers/nvme/host/pci.c
View File

@ -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);
}