sim hot swap problem with Telit GE910-QUAD

[Carlo Lobrano]

Hi Aleksander, Tim,


I just reproduced the issue on my hardware, so I can develop a patch for
> this
>


after some analysis, I think that the fix for this issue should count two
steps

1. When +CSIM=1 is sent, the QSS handler should ignore QSS unsolicited -> I
brefly solved this with a "*is_csim_locked*" boolean in
MMBroadbandModemTelit priv, set by *csim_lock_ready* and read by the
handler.

2. As well as +CSIM=1 causes a #QSS=0, even +CSIM=0 causes a #QSS=1, but
this time we need to wait for this unsolicited to come before accepting any
other call to the SIM. Considering that the very next call is +CSRM, we
need to stop soon after unlocking SIM interface.

I think I can do this in *csim_unlock_ready*, waiting 'till the QSS handler
receives #QSS=1 (and up to some maximum amount of time, like 3-5 seconds,
just to be sure), but since this will stop the entire process I preferred
to share this idea with you before working on it.

what do you think?​
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