[PATCH v5 0/4] New Microsemi PCI Switch Management Driver

[Logan Gunthorpe]

On 01/03/17 05:23 PM, Logan Gunthorpe wrote:
> Because of how poll works, I don't see how I can just hold a semaphore
> inside every fops call like the tpm code does.

On 01/03/17 04:58 PM, Jason Gunthorpe wrote:
> Both infiniband and TPM have the 'detach' flavour of unplug where the
> user is not forced to close their open cdevs. For simpler cases you
> can just wait for all cdevs to close with a simple rwsem, much like
> sysfs does already during device_del.

Though, after reading your email again, a hard fence on close sounds
like a good idea. Tomorrow I'll post a v6 that uses that approach.


Thanks,

Logan