On 1.10.2015 17:55, Matthew R. Ochs wrote: > During an EEH freeze event, certain CXL services should not be > called until after the hardware reset has taken place. Doing so > can result in unnecessary failures and possibly cause other ill > effects by triggering hardware accesses. This translates to a > requirement to quiesce all threads that may potentially use CXL > runtime service during this window. In particular, multiple ioctls > make use of the CXL services when acting on contexts on behalf of > the user. Thus, it is essential to 'drain' running ioctls _before_ > proceeding with handling the EEH freeze event. > > Create the ability to drain ioctls by wrapping the ioctl handler > call in a read semaphore and then implementing a small routine that > obtains the write semaphore, effectively creating a wait point for > all currently executing ioctls. > > Signed-off-by: Matthew R. Ochs <mrochs@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Manoj N. Kumar <manoj@xxxxxxxxxxxxxxxxxx> > Reviewed-by: Brian King <brking@xxxxxxxxxxxxxxxxxx> > Reviewed-by: Daniel Axtens <dja@xxxxxxxxxx> Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx> Tomas -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
