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stm class: Mark src::link __rcu

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Source device's link is protected with srcu, mark it as such to have
proper build-time validation of accesses to this field. The update
side that's dereferencing it under an update lock also needs an
accessor to dereference this field to keep sparse happy.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2015-10-06 12:47:17 +03:00 committed by Greg Kroah-Hartman
parent fab6266e82
commit 0df771dedf
2 changed files with 7 additions and 4 deletions
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9
drivers/hwtracing/stm/core.c
View File

@ -781,17 +781,20 @@ fail_detach:
static void __stm_source_link_drop(struct stm_source_device *src,
struct stm_device *stm)
{
struct stm_device *link;
spin_lock(&src->link_lock);
if (WARN_ON_ONCE(src->link != stm)) {
link = srcu_dereference_check(src->link, &stm_source_srcu, 1);
if (WARN_ON_ONCE(link != stm)) {
spin_unlock(&src->link_lock);
return;
}
stm_output_free(src->link, &src->output);
stm_output_free(link, &src->output);
/* caller must hold stm::link_lock */
list_del_init(&src->link_entry);
/* matches stm_find_device() from stm_source_link_store() */
stm_put_device(src->link);
stm_put_device(link);
rcu_assign_pointer(src->link, NULL);
spin_unlock(&src->link_lock);

2
drivers/hwtracing/stm/stm.h
View File

@ -74,7 +74,7 @@ struct stm_source_device {
struct device dev;
struct stm_source_data *data;
spinlock_t link_lock;
struct stm_device *link;
struct stm_device __rcu *link;
struct list_head link_entry;
/* one output per stm_source device */
struct stp_policy_node *policy_node;