Hi, I am work on a Linux embedded IoT device including both 4G LTE and WiFi modems, I use linux-firmware-sd8801 and Marvell driver mwifiex_sdio.ko and mwifiex.ko drivers, it works well for a couple of days, then the WiFi failed which could be caused by low WiFi signal strength level, but that should not cause the mwifiex_sdio errors. While the connman was able to switch from WiFi connection to 4G LTE connection automatically, following error messages popped up in console and kernel logs every second to consume lots of resources despite the 4G LTE being connected and worked perfectly. ............... [924785.415505] mwifiex_sdio mmc0:0001:1: PREP_CMD: card is removed [924807.818102] mwifiex_sdio mmc0:0001:1: Ignore scan. Card removed or firmware in bad state [924808.406775] mwifiex_sdio mmc0:0001:1: PREP_CMD: card is removed ........... I am not quite sure if the error message indicated the mwifiex_sdio or kernel crash or not, but given the 4G LTE was connected fine, the device was still in good operation, I don't think it is a kernel crash sign. My questions are: (a) Is there any way to recover the mwifiex_sdio or reset mwifiex_sdio? I tried modprobe -r mwifiex_sdio, modprobe mwifiex_sdio and modprobe mwifiex, but that crashed my debug console despite the device was still in good operation. I could only make it recover by rebooting the device which was not a good solution as it was operated 24 / 7. (b) If there is no way to recover or reset mwifiex_sdio, are there any methods to suppress mwifiex_sdio endless error messages to both debug console and to kernel logs? Thank you. Kind regards, - jh
