Messages in this thread | | | From | Duncan Sands <> | Subject | Re: [PATCH][ATM] use rtnl_{lock,unlock} during device operations (take 2) | Date | Mon, 9 Jun 2003 15:37:13 +0200 |
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> btw, you might get async device 'releases' more often than > you would like. some atm devices are usb and could be > unplugged during operation (yes, that's really bad but it > would be wise to be prepared for this.) i actually have > a cardbus atm interface. i might eject it accidentally.
Right. In the speedtouch (USB ATM DSL modem) driver, when the device is unplugged I would have liked to be able to say to the ATM layer: I've gone, don't call me any more. But since there is no way to do this, instead I do:
- refuse to open any more vccs; fail all attempts to send packets - call shutdown_atm_dev. This means that when the last vcc is closed, atm_dev_close will be called in my driver. - really shutdown in atm_dev_close
In practice that means that the vcc remains open until pppd realises that the connection has gone down (no more echo requests getting through, for example). Maybe I should push a NULL skb down into each vcc to get it to close?
Another thing: if the modem is plugged in again, and pppd relaunched, it would be nice if connections that were open when the modem was unplugged automagically recovered. Is that possible?
Ciao,
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