CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2010/07/23 03:41:16
Modified files:
sys/dev : vscsi.c
Log message:
matthew@ noted a possible misuse of the rwlock used to protect vscsi
from being opened by multiple processes at the same time. then he
pointed out that pool_get can sleep in the middle of scsi_cmd,
during which time the process processing the vscsi requests can go
away.
this uses a state variable to protect vscsi from multiple opens
which is checked by all the process and scsi midlayer entrypoints.
it avoids a potential sleep in the middle of the scsi_cmd handler
by moving to iopools.
lots of tweaks and feedback by matthew@
