TPM drivers should not call dev_set_drvdata (or aliases), only the core
code is allowed to call dev_set_drvdata, and it does it during
tpm_register_hardware.

These extra sets are harmless, but are an anti-pattern that many drivers
have copied.
Signed-off-by: NJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: NJoel Schopp <jschopp@linux.vnet.ibm.com>
Reviewed-by: NPeter Huewe <peterhuewe@gmx.de>
Acked-by: NAshley Lai <adlai@linux.vnet.ibm.com>
Signed-off-by: NPeter Huewe <peterhuewe@gmx.de>

This is a complete rewrite of the Xen TPM frontend driver, taking
advantage of a simplified frontend/backend interface and adding support
for cancellation and timeouts.  The backend for this driver is provided
by a vTPM stub domain using the interface in Xen 4.3.
Signed-off-by: NDaniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: NMatthew Fioravante <matthew.fioravante@jhuapl.edu>
Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: NPeter Huewe <peterhuewe@gmx.de>
Reviewed-by: NPeter Huewe <peterhuewe@gmx.de>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>