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SubjectRe: Problem with modprobe
On Tue, Sep 27, 2022 at 12:11:24PM -0500, Larry Finger wrote:
> Hi,
>
> The driver for the Realtek RTL8821CE network card show some asymmetrical
> behavior between loading and unloading.
>
> Starting from scratch, a load command provides the expected results:
>
> finger@localhost:~/rtw88>sudo modprobe -v rtw88_8821ce
> insmod /lib/modules/6.1.0-rc3-wireless-next-00623-g2bc09edc7fa2-dirty/kernel/drivers/net/wireless/realtek/rtw88/rtw88_core.ko
>
> insmod /lib/modules/6.1.0-rc3-wireless-next-00623-g2bc09edc7fa2-dirty/kernel/drivers/net/wireless/realtek/rtw88/rtw88_pci.ko
>
> insmod /lib/modules/6.1.0-rc3-wireless-next-00623-g2bc09edc7fa2-dirty/kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821c.ko
>
> insmod /lib/modules/6.1.0-rc3-wireless-next-00623-g2bc09edc7fa2-dirty/kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821ce.ko
>
> Unloading produces a different result:
>
> finger@localhost:~/rtw88>sudo modprobe -rv rtw88_8821ce
> rmmod rtw88_8821ce
> rmmod rtw88_pci
> rmmod rtw88_8821c
>
> Note that rtw88_core is still loaded and needs to be unloaded separately:
>
> finger@localhost:~/rtw88>sudo modprobe -rv rtw88_core
> rmmod rtw88_core
>
> The appropriate lines from modules.dep reformatted for clarity are as follows:
>
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_core.ko:
> kernel/net/mac80211/mac80211.ko
> kernel/lib/crypto/libarc4.ko
> kernel/net/wireless/cfg80211.ko
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821c.ko:
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_core.ko
> kernel/net/mac80211/mac80211.ko
> kernel/lib/crypto/libarc4.ko
> kernel/net/wireless/cfg80211.ko
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821ce.ko:
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_8821c.ko
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_pci.ko
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_core.ko
> kernel/net/mac80211/mac80211.ko
> kernel/lib/crypto/libarc4.ko
> kernel/net/wireless/cfg80211.ko
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_pci.ko:
> kernel/drivers/net/wireless/realtek/rtw88/rtw88_core.ko
> kernel/net/mac80211/mac80211.ko
> kernel/lib/crypto/libarc4.ko
> kernel/net/wireless/cfg80211.ko
>
> What is the explanation for the failure to auto-unload rtw88_core?

I don't think we ever auto-unload dependant modules as we don't know if
they are still in use or not (hint, module references is not a
representation if the module is in use or not.)

So this is working as intended, right? And how it's always worked?

thanks,

greg k-h

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