Hi Daniel, > > That's strange. > > "mwifiex_sdio mmc0:0001:1: rx_pending=0, tx_pending=0, cmd_pending=-1" is from > > mwifiex_remove_card(). > > I haven't dug into the code, but it seems quite normal to me. It makes > sense for mwifiex_remove_card to be called in the rmmod path. And it Ah, you are right. I overlooked that rmmod will lead to mwifiex_remove_card. > makes sense for the kernel not to report that the card was removed, > since it wasn't actually removed. Only the module was unloaded. > > >> Under this kernel, I'm not sure if the power is or isn't being cut at > >> this point. I don't think this is relevant though; regular > > > > "we quite regularly will power down the wireless card when it is not > > being actively used..." > > > > I interpreted this statement as "the power to the card is being cut while inactive". > > mwifiex_remove_card() is called seems agrees with it. Perhaps I'm missing something here. > > Yes, we will want to make sure that the power is physically cut. I > just haven't verified what the exact behaviour is under 3.8. MMC core will report "mmc0: card 0001 removed" when the power is cut. > Nevertheless, I think this detail is irrelevant, given that > rmmod/insmod cycles work fine, but the problem only occurs when > scanning is involved. > > >> insmod/rmmod cycles work fine, the problem only appears when tearing > >> down the interface while a scan is in progress. > > > > Could you add some debug logs in the tear-down path to show where exactly it gets stuck? > > I mis-spoke there, sorry. The problem happens on the next modprobe > *after* a teardown when a scan was in progress. The teardown itself > seems to have completed without getting stuck. > > If you have any suggestions for where to add debug messages, that > would be appreciated. Otherwise I will look into sprinkling a few > throughout the probe sequences to see if any communication succeeds > before the first error is printed. For now, let's use dynamic_debug to collect some logs. CONFIG_DYNAMIC_DEBUG=y # run these commands before running the test script: echo "module mwifiex +p" > /sys/kernel/debug/dynamic_debug/control echo "module mwifiex_sdio +p" > /sys/kernel/debug/dynamic_debug/control Thanks, Bing -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
