question on scsi_alloc_sdev()

[Martin Peschke <mp3@de.ibm.com>]

Does anybody know for sure whether scsi_alloc_sdev() is guaranteed to
be called in process context or not?

There seem to be contradictory signs in scsi_scan.c:
scsi_alloc_sdev() uses GFP_ATOMIC, as related functions do.
It might be called in a section protected by a mutex.

I conducted a little experiment using might_sleep() in scsi_alloc_sdev()
- no backtrace on the console, hence process context.

Or, is the purpose of GFP_ATOMIC just (SCSI) I/O avoidance, and sleeping
isn't an issue?

Thanks,
Martin