On Thu, Apr 11, 2019 at 07:07:42AM -0700, Dennis Dalessandro wrote: > From: Josh Collier <josh.d.collier@xxxxxxxxx> > > Some kernels now enable CONFIG_IO_STRICT_DEVMEM > which prevents multiple handles to PCI resource0. In order > to continue to support expansion ROM updates while the > driver is loaded, the driver must now provide an interface > to control the expansion ROM write protection. > > This patch adds an exprom_wp debugfs interface that > allows the hfi1_eprom user tool to disable the expansion ROM > write protection by opening the file and writing a '1'. > The write protection is released when writing a '0' or > automatically re-enabled when the handle is closed. > The current implementation will only allow one handle > to be opened at a time across all hfi1 devices. > > Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> > Signed-off-by: Josh Collier <josh.d.collier@xxxxxxxxx> > Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> > --- > Changes since v1: > Use bool instead of int for disabled flag > Simplify open routine with test/set vs atomic_inc/dec. > --- > drivers/infiniband/hw/hfi1/debugfs.c | 74 ++++++++++++++++++++++++++++++++++ > 1 files changed, 74 insertions(+), 0 deletions(-) Applied to for-next, thanks Jason
