On Tue, 2017-09-12 at 13:43 -0600, Jens Axboe wrote: > On 09/12/2017 10:36 AM, Luca Coelho wrote: > > On Tue, 2017-09-12 at 16:11 +0000, Coelho, Luciano wrote: > > > Hi Jens, > > > > > > On Tue, 2017-09-12 at 09:48 -0600, Jens Axboe wrote: > > > > Hi, > > > > > > > > I have no wifi in current git (8fac2f96ab8), it simply fails with: > > > > > > > > [ 4.363481] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-34.ucode failed with error -2 > > > > [ 4.363733] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-33.ucode failed with error -2 > > > > [ 4.363744] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-32.ucode failed with error -2 > > > > [ 4.368077] iwlwifi 0000:04:00.0: loaded firmware version 31.532993.0 op_mode iwlmvm > > > > [ 4.461753] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208 > > > > [ ... ] > > > > [ 9.510570] iwlwifi 0000:04:00.0: Failed to load firmware chunk! > > > > [ 9.513903] iwlwifi 0000:04:00.0: Could not load the [0] uCode section > > > > [ 9.516201] iwlwifi 0000:04:00.0: Failed to start INIT ucode: -110 > > > > [ 9.530842] iwlwifi 0000:04:00.0: Failed to run INIT ucode: -110 > > > > > > > > I get the same thing with -27 of the firmware: > > > > > > > > [ 60.990831] Intel(R) Wireless WiFi driver for Linux > > > > [ 60.990833] Copyright(c) 2003- 2015 Intel Corporation > > > > [ 60.991936] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-34.ucode failed with error -2 > > > > [ 60.991941] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-33.ucode failed with error -2 > > > > [ 60.991946] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-32.ucode failed with error -2 > > > > [ 60.991957] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-31.ucode failed with error -2 > > > > [ 60.991964] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-30.ucode failed with error -2 > > > > [ 60.991969] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-29.ucode failed with error -2 > > > > [ 60.991975] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-8000C-28.ucode failed with error -2 > > > > [ 61.029852] iwlwifi 0000:04:00.0: loaded firmware version 27.541033.0 op_mode iwlmvm > > > > [ 61.043660] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208 > > > > [ 66.070135] iwlwifi 0000:04:00.0: Failed to load firmware chunk! > > > > [ 66.070149] iwlwifi 0000:04:00.0: Could not load the [0] uCode section > > > > [ 66.070165] iwlwifi 0000:04:00.0: Failed to start INIT ucode: -110 > > > > [ 66.083462] iwlwifi 0000:04:00.0: Failed to run INIT ucode: -110 > > > > > > > > Things work fine in 4.13-rc7+, which was the last kernel I ran on my laptop. > > > > > > This is strange, Linus has been running this same combination with -31 > > > (with -27 we had a regression, but it was fixed recently and the fix is > > > in the current master). I have also tried this combination with both > > > -27 and -31 after my fix and it works fine. > > > > > > There are only a couple of other patches that may affect iwlwifi since > > > the previous net-next.git pull request... > > > > > > I'll try this combination on my machine and see if I can reproduce the > > > problem. > > > > I just booted my machine with the latest linux.git/master (8fac2f96ab86) > > and it works without a problem: > > > > [ 8.902174] Intel(R) Wireless WiFi driver for Linux > > [ 8.902174] Copyright(c) 2003- 2015 Intel Corporation > > [ 8.995112] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-34.ucode failed with error -2 > > [ 8.995136] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-33.ucode failed with error -2 > > [ 9.026455] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-32.ucode failed with error -2 > > [ 9.348325] iwlwifi 0000:02:00.0: loaded firmware version 31.532993.0 op_mode iwlmvm > > [ 9.369307] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0x208 > > [ 9.435915] iwlwifi 0000:02:00.0: base HW address: 34:13:e8:2d:65:ef > > [ 9.509217] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs' > > > > > > So this seems to be something that doesn't happen in all machines, maybe > > a PCIe problem? > > > > Is there any chance you could try to bisect this? > > Bisect done, it tells me that this: > > commit 40f11adc7cd9281227f0a6a627d966dd0a5f0cd9 > Author: Srinath Mannam <srinath.mannam@xxxxxxxxxxxx> > Date: Fri Aug 18 21:50:48 2017 -0500 > > PCI: Avoid race while enabling upstream bridges > > is the first bad commit. Reverting that on top of master makes things > work fine again, so that commit is definitely b0rken. > > CC'ing the guilty part and Bjorn. I'm assuming it's the pci_is_enabled() > check, since the rest of the patch shouldn't have functional changes. Great! I'm glad that you could track it down to a single commit. Bjorn/Srinath, let me know if it is something that the iwlwifi is not doing properly. But AFAICT the !pci_is_enabled() is checking the bridge *above* the iwlwifi device, so I don't think that will be the case. -- Cheers, Luca.
