scsi_add_host() context
While examining the various calls in the mid level that can be called from a LLD, most are designed to be called from an interrupt or related context (e.g. scsi_adjust_queue_depth() ).
However, the detection of a new host requires a LLD to call scsi_register() and scsi_add_host(). The latter call does a SCSI bus scan which takes time and sends commands like
INQUIRY and REPORT_LUNS back through the LLD. So scsi_add_host()
should not be called from an interrupt context. Can this be
guaranteed in a hotplug environment? Is a worker thread
required?
Doug Gilbert
Quoted 5 lines · Douglas Gilbert
While examining the various calls in the mid level that can be called from a LLD, most are designed to be called from an interrupt or related context (e.g.
scsi_adjust_queue_depth()).
Quoted 7 lines
However, the detection of a new host requires a LLD to call
scsi_register()andscsi_add_host(). The latter call does a SCSI bus scan which takes time and sends commands like INQUIRY andREPORT_LUNSback through the LLD. Soscsi_add_host()should not be called from an interrupt context. Can this be guaranteed in a hotplug environment? Is a worker thread required?
For the driver model ->probe is defined to run in process context, yes.