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| author | Maciej W. Rozycki <macro@orcam.me.uk> | 2024-08-09 14:24:56 +0100 |
|---|---|---|
| committer | Krzysztof Wilczyński <kwilczynski@kernel.org> | 2024-09-09 13:58:38 +0000 |
| commit | 712e49c967064a3a7a5738c6f65ac540a3f6a1df (patch) | |
| tree | b8eb90822d4414a00a6706090dcc906370a87a50 /drivers/pci/quirks.c | |
| parent | f68dea13405c94381d08f42dbf0416261622bdad (diff) | |
| download | linux-712e49c967064a3a7a5738c6f65ac540a3f6a1df.tar.gz linux-712e49c967064a3a7a5738c6f65ac540a3f6a1df.tar.bz2 linux-712e49c967064a3a7a5738c6f65ac540a3f6a1df.zip | |
PCI: Correct error reporting with PCIe failed link retraining
Only return successful completion status from pcie_failed_link_retrain() if
retraining has actually been done, preventing excessive delays from being
triggered at call sites in a hope that communication will finally be
established with the downstream device where in fact nothing has been done
about the link in question that would justify such a hope.
Fixes: a89c82249c37 ("PCI: Work around PCIe link training failures")
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2408091133260.61955@angie.orcam.me.uk
Reported-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/aa2d1c4e-9961-d54a-00c7-ddf8e858a9b0@linux.intel.com/
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: <stable@vger.kernel.org> # v6.5+
Diffstat (limited to 'drivers/pci/quirks.c')
| -rw-r--r-- | drivers/pci/quirks.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index ee86793109ff..4d5483e9f63f 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -78,7 +78,8 @@ * again to remove any residual state, ignoring the result as it's supposed * to fail anyway. * - * Return TRUE if the link has been successfully retrained, otherwise FALSE. + * Return TRUE if the link has been successfully retrained. Return FALSE + * if retraining was not needed or we attempted a retrain and it failed. */ bool pcie_failed_link_retrain(struct pci_dev *dev) { @@ -87,6 +88,7 @@ bool pcie_failed_link_retrain(struct pci_dev *dev) {} }; u16 lnksta, lnkctl2; + bool ret = false; if (!pci_is_pcie(dev) || !pcie_downstream_port(dev) || !pcie_cap_has_lnkctl2(dev) || !dev->link_active_reporting) @@ -104,7 +106,8 @@ bool pcie_failed_link_retrain(struct pci_dev *dev) lnkctl2 |= PCI_EXP_LNKCTL2_TLS_2_5GT; pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, lnkctl2); - if (pcie_retrain_link(dev, false)) { + ret = pcie_retrain_link(dev, false) == 0; + if (!ret) { pci_info(dev, "retraining failed\n"); pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, oldlnkctl2); @@ -126,13 +129,14 @@ bool pcie_failed_link_retrain(struct pci_dev *dev) lnkctl2 |= lnkcap & PCI_EXP_LNKCAP_SLS; pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, lnkctl2); - if (pcie_retrain_link(dev, false)) { + ret = pcie_retrain_link(dev, false) == 0; + if (!ret) { pci_info(dev, "retraining failed\n"); return false; } } - return true; + return ret; } static ktime_t fixup_debug_start(struct pci_dev *dev, |