Hi Janusz,
>
> Hello,
>
> I have intel7260 connected via external PCIe + DELL latitude e6430.
>
> [ 5199.805417] iwlwifi 0000:04:00.0: enabling device (0100 -> 0102) [
> 5199.809222] iwlwifi 0000:04:00.0: loaded firmware version
> 17.275772.0 op_mode iwlmvm
> [ 5199.819548] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC
> 7260, REV=0x144 [ 5199.819658] iwlwifi 0000:04:00.0: L1 Enabled - LTR
> Disabled [ 5199.820018] iwlwifi 0000:04:00.0: L1 Enabled - LTR Disabled [
> 5200.012786] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
> [ 5200.020148] iwlwifi 0000:04:00.0 wlan3: renamed from wlan0
>
> [ 5282.743987] iwlwifi 0000:04:00.0: L1 Enabled - LTR Disabled [ 5282.781812] --
> ----------[ cut here ]------------ [ 5282.781823] WARNING: CPU: 3 PID: 3760 at
> drivers/net/wireless/intel/iwlwifi/pcie/trans.c:1561
> iwl_trans_pcie_grab_nic_access+0xe6/0xf0 [iwlwifi]() [ 5282.781824]
> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) [
Well... you are not the only one to complain about this issue and unfortunately, there isn't much I can do. What it means is that the device is removed from the bus by the PCIe controller. This happens due to an electrical problem which I can't really help with. This can be caused by different types of voodoos, like interference on the PCIe lines and other things that can't really be root caused without taking the system into the lab and adding PCIe analyzer probes.
I am afraid I can't really help.
As a workaround, you can unbind the device from the bus and re-enumerate. This will bring the device back... until the next failure.
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