[PATCH 1/3 v4] drm: Introduce drm_connector_register_all() helper
Alexey Brodkin
Alexey.Brodkin at synopsys.com
Tue Mar 29 10:10:08 UTC 2016
Hi David,
On Tue, 2016-03-29 at 12:08 +0200, David Herrmann wrote:
> Hi
>
> On Tue, Mar 29, 2016 at 12:02 PM, Alexey Brodkin
> <Alexey.Brodkin at synopsys.com> wrote:
> >
> > As a pair to already existing drm_connector_unregister_all() we're adding
> > generic implementation of what is already done in some drivers.
> >
> > Once this helper is implemented we'll be ready to switch existing
> > driver-specific implementations with the generic one.
> >
> > Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
> > Cc: Daniel Vetter <daniel at ffwll.ch>
> > Cc: David Airlie <airlied at linux.ie>
> > Cc: David Herrmann <dh.herrmann at gmail.com>
> > ---
> >
> > Changes v3 -> v4:
> > * In drm_connector_register_all() fail path which calls unregister_all()
> > is moved outside of loop&locked section (as suggested by Daniel)
> >
> > Changes v2 -> v3:
> > * Updated title with capital after colon
> > * Simplified failure path with direct and unconditional invocation of
> > unregister_all()
> > * Updated kerneldoc description of the drm_connector_register_all()
> >
> > Changes v1 -> v2:
> > * Rename drm_connector_unplug_all() to drm_connector_unregister_all()
> > * Use drm_for_each_connector() instead of list_for_each_entry()
> > * Updated kerneldoc for drm_dev_register()
> >
> > drivers/gpu/drm/drm_crtc.c | 39 +++++++++++++++++++++++++++++++++++++++
> > drivers/gpu/drm/drm_drv.c | 6 +++++-
> > include/drm/drm_crtc.h | 3 ++-
> > 3 files changed, 46 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> > index 7675826..3e4cdb1 100644
> > --- a/drivers/gpu/drm/drm_crtc.c
> > +++ b/drivers/gpu/drm/drm_crtc.c
> > @@ -1079,6 +1079,45 @@ void drm_connector_unregister(struct drm_connector *connector)
> > EXPORT_SYMBOL(drm_connector_unregister);
> >
> > /**
> > + * drm_connector_register_all - register all connectors
> > + * @dev: drm device
> > + *
> > + * This function registers all connectors in sysfs and other places so that
> > + * userspace can start to access them. Drivers can call it after calling
> > + * drm_dev_register() to complete the device registration, if they don't call
> > + * drm_connector_register() on each connector individually.
> > + *
> > + * When a device is unplugged and should be removed from userspace access,
> > + * call drm_connector_unregister_all(), which is the inverse of this
> > + * function.
> > + *
> > + * Returns:
> > + * Zero on success, error code on failure.
> > + */
> > +int drm_connector_register_all(struct drm_device *dev)
> > +{
> > + struct drm_connector *connector;
> > + int ret;
> > +
> > + mutex_lock(&dev->mode_config.mutex);
> > +
> > + drm_for_each_connector(connector, dev) {
> > + ret = drm_connector_register(connector);
> > + if (ret)
> > + goto err;
> > + }
> > +
> > + mutex_unlock(&dev->mode_config.mutex);
> > +
> > + return 0;
> > +
> > +err:
> > + drm_connector_unregister_all(dev);
> You _must_ unlock the mutex before returning.
So true!
BTW that's why I liked the previous solution - code was much cleaner
with only 1 branch of execution.
Will resend v5 in a minute.
-Alexey
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