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cam: Permit non-pollable sims.

Description

cam: Permit non-pollable sims.

Some CAM sim drivers do not support polling (notably iscsi(4)).
Rather than using a no-op poll routine that always times out requests,
permit a SIM to set a NULL poll callback. cam_periph_runccb() will
fail polled requests non-pollable sims immediately as if they had
timed out.

Reviewed by: scottl, mav (earlier version)
Reviewed by: imp
MFC after: 2 weeks
Sponsored by: Chelsio
Differential Revision: https://reviews.freebsd.org/D28453

Details

Provenance
jhbAuthored on Feb 11 2021, 9:49 PM
Reviewer
scottl
Differential Revision
D28453: cam: Permit non-pollable sims.
Parents
R10:6d2a10d96fb5: Widen ifnet_detach_sxlock coverage
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