| Message ID | 20221207061815.7404-1-vikram.garhwal@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | dynamic node programming using overlay dtbo | expand |
Hi Vikram, On 07/12/2022 07:18, Vikram Garhwal wrote: > > > Rename iommu_dt_device_is_assigned() to iommu_dt_device_is_assigned_lock(). s/lock/locked/ > > Moving spin_lock to caller was done to prevent the concurrent access to > iommu_dt_device_is_assigned while doing add/remove/assign/deassign. > > Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com> > Reviewed-by: Luca Fancellu <luca.fancellu@arm.com> > --- > xen/drivers/passthrough/device_tree.c | 23 +++++++++++++++++++---- > 1 file changed, 19 insertions(+), 4 deletions(-) > > diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c > index 1c32d7b50c..bb4cf7784d 100644 > --- a/xen/drivers/passthrough/device_tree.c > +++ b/xen/drivers/passthrough/device_tree.c > @@ -83,16 +83,15 @@ fail: > return rc; > } > > -static bool_t iommu_dt_device_is_assigned(const struct dt_device_node *dev) > +static bool_t > + iommu_dt_device_is_assigned_locked(const struct dt_device_node *dev) This should not be indented > { > bool_t assigned = 0; > > if ( !dt_device_is_protected(dev) ) > return 0; > > - spin_lock(&dtdevs_lock); > assigned = !list_empty(&dev->domain_list); > - spin_unlock(&dtdevs_lock); > > return assigned; > } > @@ -213,27 +212,43 @@ int iommu_do_dt_domctl(struct xen_domctl *domctl, struct domain *d, > if ( (d && d->is_dying) || domctl->u.assign_device.flags ) > break; > > + spin_lock(&dtdevs_lock); > + > ret = dt_find_node_by_gpath(domctl->u.assign_device.u.dt.path, > domctl->u.assign_device.u.dt.size, > &dev); > if ( ret ) > + { > + spin_unlock(&dtdevs_lock); > + I think removing a blank line here and in other places would look better. ~Michal
diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c index 1c32d7b50c..bb4cf7784d 100644 --- a/xen/drivers/passthrough/device_tree.c +++ b/xen/drivers/passthrough/device_tree.c @@ -83,16 +83,15 @@ fail: return rc; } -static bool_t iommu_dt_device_is_assigned(const struct dt_device_node *dev) +static bool_t + iommu_dt_device_is_assigned_locked(const struct dt_device_node *dev) { bool_t assigned = 0; if ( !dt_device_is_protected(dev) ) return 0; - spin_lock(&dtdevs_lock); assigned = !list_empty(&dev->domain_list); - spin_unlock(&dtdevs_lock); return assigned; } @@ -213,27 +212,43 @@ int iommu_do_dt_domctl(struct xen_domctl *domctl, struct domain *d, if ( (d && d->is_dying) || domctl->u.assign_device.flags ) break; + spin_lock(&dtdevs_lock); + ret = dt_find_node_by_gpath(domctl->u.assign_device.u.dt.path, domctl->u.assign_device.u.dt.size, &dev); if ( ret ) + { + spin_unlock(&dtdevs_lock); + break; + } ret = xsm_assign_dtdevice(XSM_HOOK, d, dt_node_full_name(dev)); if ( ret ) + { + spin_unlock(&dtdevs_lock); + break; + } if ( domctl->cmd == XEN_DOMCTL_test_assign_device ) { - if ( iommu_dt_device_is_assigned(dev) ) + + if ( iommu_dt_device_is_assigned_locked(dev) ) { printk(XENLOG_G_ERR "%s already assigned.\n", dt_node_full_name(dev)); ret = -EINVAL; } + + spin_unlock(&dtdevs_lock); + break; } + spin_unlock(&dtdevs_lock); + if ( d == dom_io ) return -EINVAL;