From: Ethan Zhao <haifeng.zhao@intel.com>
To: bhelgaas@google.com, oohall@gmail.com, ruscur@russell.cc,
lukas@wunner.de, andriy.shevchenko@linux.intel.com,
stuart.w.hayes@gmail.com, mr.nuke.me@gmail.com,
mika.westerberg@linux.intel.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
pei.p.jia@intel.com, ashok.raj@linux.intel.com,
sathyanarayanan.kuppuswamy@intel.com,
Ethan Zhao <haifeng.zhao@intel.com>
Subject: [PATCH 4/5 V3] PCI: only return true when dev io state is really changed
Date: Sun, 27 Sep 2020 01:28:40 -0400 [thread overview]
Message-ID: <20200927052841.12629-5-haifeng.zhao@intel.com> (raw)
In-Reply-To: <20200927052841.12629-1-haifeng.zhao@intel.com>
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>
---
Changnes:
V2: revise description and code according to suggestion from Andy.
V3: Change code to simpler.
drivers/pci/pci.h | 37 +++++--------------------------------
1 file changed, 5 insertions(+), 32 deletions(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index fa12f7cbc1a0..a2c1c7d5f494 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -359,39 +359,12 @@ struct pci_sriov {
static inline bool pci_dev_set_io_state(struct pci_dev *dev,
pci_channel_state_t new)
{
- bool changed = false;
-
device_lock_assert(&dev->dev);
- switch (new) {
- case pci_channel_io_perm_failure:
- switch (dev->error_state) {
- case pci_channel_io_frozen:
- case pci_channel_io_normal:
- case pci_channel_io_perm_failure:
- changed = true;
- break;
- }
- break;
- case pci_channel_io_frozen:
- switch (dev->error_state) {
- case pci_channel_io_frozen:
- case pci_channel_io_normal:
- changed = true;
- break;
- }
- break;
- case pci_channel_io_normal:
- switch (dev->error_state) {
- case pci_channel_io_frozen:
- case pci_channel_io_normal:
- changed = true;
- break;
- }
- break;
- }
- if (changed)
- dev->error_state = new;
- return changed;
+ if (dev->error_state == new)
+ return false;
+
+ dev->error_state = new;
+ return true;
}
static inline int pci_dev_set_disconnected(struct pci_dev *dev, void *unused)
--
2.18.4
next prev parent reply other threads:[~2020-09-27 5:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-27 5:28 [PATCH 0/5 V3] Fix DPC hotplug race and enhance error handling Ethan Zhao
2020-09-27 5:28 ` [PATCH 1/5 V3] PCI: define a function to check and wait till port finish DPC handling Ethan Zhao
2020-09-27 5:28 ` [PATCH 2/5 V3] PCI: pciehp: check and wait port status out of DPC before handling DLLSC and PDC Ethan Zhao
2020-09-27 5:28 ` [PATCH 3/5 V3] PCI/ERR: get device before call device driver to avoid NULL pointer reference Ethan Zhao
2020-09-27 5:28 ` Ethan Zhao [this message]
2020-09-27 5:28 ` [PATCH 5/5 V3] PCI/ERR: don't mix io state not changed and no driver together Ethan Zhao
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