From 06bf403de344a8a0811ebd24992d2a08022c5225 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Mon, 30 Nov 2015 21:02:55 +0200 Subject: [PATCH] PCI / PM: Tune down retryable runtime suspend error messages The runtime PM core doesn't treat EBUSY and EAGAIN retvals from the driver suspend hooks as errors, but they still show up as errors in dmesg. Tune them down. See rpm_suspend() for details of handling these return values. Note that we use dev_dbg() for the retryable retvals, so after this change you'll need either CONFIG_DYNAMIC_DEBUG or CONFIG_PCI_DEBUG for them to show up in the log. One problem caused by this was noticed by Daniel: the i915 driver returns EAGAIN to signal a temporary failure to suspend and as a request towards the RPM core for scheduling a suspend again. This is a normal event, but the resulting error message flags a breakage during the driver's automated testing which parses dmesg and picks up the error. Reported-by: Daniel Vetter Link: https://bugs.freedesktop.org/show_bug.cgi?id=92992 Signed-off-by: Imre Deak Acked-by: Bjorn Helgaas Signed-off-by: Rafael J. Wysocki --- drivers/pci/pci-driver.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 4446fcb..d7ffd66 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -1146,9 +1146,21 @@ static int pci_pm_runtime_suspend(struct device *dev) pci_dev->state_saved = false; pci_dev->no_d3cold = false; error = pm->runtime_suspend(dev); - suspend_report_result(pm->runtime_suspend, error); - if (error) + if (error) { + /* + * -EBUSY and -EAGAIN is used to request the runtime PM core + * to schedule a new suspend, so log the event only with debug + * log level. + */ + if (error == -EBUSY || error == -EAGAIN) + dev_dbg(dev, "can't suspend now (%pf returned %d)\n", + pm->runtime_suspend, error); + else + dev_err(dev, "can't suspend (%pf returned %d)\n", + pm->runtime_suspend, error); + return error; + } if (!pci_dev->d3cold_allowed) pci_dev->no_d3cold = true; -- 2.7.4