Messages in this thread |  | | Subject | Re: [PATCH 4/5 V4] PCI: only return true when dev io state is really changed | From | Joe Perches <> | Date | Sun, 27 Sep 2020 02:14:25 -0700 |
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On Sun, 2020-09-27 at 04:27 -0400, Ethan Zhao wrote: > When uncorrectable error happens, AER driver and DPC driver interrupt > handlers likely call > > pcie_do_recovery() > ->pci_walk_bus() > ->report_frozen_detected() > > with pci_channel_io_frozen the same time. > If pci_dev_set_io_state() return true even if the original state is > pci_channel_io_frozen, that will cause AER or DPC handler re-enter > the error detecting and recovery procedure one after another. > The result is the recovery flow mixed between AER and DPC. > So simplify the pci_dev_set_io_state() function to only return true > when dev->error_state is changed. > > Signed-off-by: Ethan Zhao <haifeng.zhao@intel.com> > Tested-by: Wen Jin <wen.jin@intel.com> > Tested-by: Shanshan Zhang <ShanshanX.Zhang@intel.com> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> > Reviewed-by: Joe Perches <joe@perches.com>
Hi Ethan/Haifeng.
Like Andy, I did not "review" this patch and sign it. I merely suggested another simplification. Please do not add -by: lines unless actually received by you.
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