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>pm_send_all</SPAN
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><H2
>Name</H2
>pm_send_all -- send request to all managed devices
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>Synopsis</H2
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><CODE
><CODE
CLASS="FUNCDEF"
>int <TT
CLASS="FUNCTION"
>pm_send_all </TT
></CODE
>(pm_request_t <TT
CLASS="PARAMETER"
><I
>rqst</I
></TT
>, void * <TT
CLASS="PARAMETER"
><I
>data</I
></TT
>);</CODE
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>Arguments</H2
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><DL
><DT
><TT
CLASS="PARAMETER"
><I
>rqst</I
></TT
></DT
><DD
><P
> power management request
</P
></DD
><DT
><TT
CLASS="PARAMETER"
><I
>data</I
></TT
></DT
><DD
><P
> data for the callback
</P
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><H2
>Description</H2
><P
> Issue a power management request to a all devices. The
<TT
CLASS="CONSTANT"
>PM_SUSPEND</TT
> events are handled specially. Any device is
permitted to fail a suspend by returning a non zero (error)
value from its callback function. If any device vetoes a
suspend request then all other devices that have suspended
during the processing of this request are restored to their
previous state.
</P
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></A
><H2
>WARNING</H2
><P
> This function takes the pm_devs_lock. The lock is not dropped until
the callbacks have completed. This prevents races against pm locking
functions, races against module unload pm_unregister code. It does
mean however that you must not issue pm_ functions within the callback
or you will deadlock and users will hate you.
</P
><P
> Zero is returned on success. If a suspend fails then the status
from the device that vetoes the suspend is returned.
</P
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><H2
>BUGS</H2
><P
> what stops two power management requests occuring in parallel
and conflicting.
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