diff options
Diffstat (limited to 'driver/kmem.c')
| -rw-r--r-- | driver/kmem.c | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/driver/kmem.c b/driver/kmem.c index b323272..9b3ab14 100644 --- a/driver/kmem.c +++ b/driver/kmem.c @@ -396,11 +396,39 @@ int pcidriver_kmem_sync_entry( pcidriver_privdata_t *privdata, pcidriver_kmem_en */ int pcidriver_kmem_sync( pcidriver_privdata_t *privdata, kmem_sync_t *kmem_sync ) { - pcidriver_kmem_entry_t *kmem_entry; + pcidriver_kmem_entry_t *kmem_entry = NULL; - /* Find the associated kmem_entry for this buffer */ - if ((kmem_entry = pcidriver_kmem_find_entry(privdata, &(kmem_sync->handle))) == NULL) + /* + * This is a shortcut to quickly find a next item in big multi-page kernel buffers + */ + spin_lock(&(privdata->kmemlist_lock)); + if (privdata->kmem_last_sync) { + if (privdata->kmem_last_sync->id == kmem_sync->handle.handle_id) + kmem_entry = privdata->kmem_last_sync; + else { + privdata->kmem_last_sync = container_of(privdata->kmem_last_sync->list.next, pcidriver_kmem_entry_t, list); + + if (privdata->kmem_last_sync) { + if (privdata->kmem_last_sync->id == kmem_sync->handle.handle_id) + kmem_entry = privdata->kmem_last_sync; + else + privdata->kmem_last_sync = NULL; + } + } + } + spin_unlock(&(privdata->kmemlist_lock)); + + /* + * If not found go the standard way + */ + if (!kmem_entry) { + if ((kmem_entry = pcidriver_kmem_find_entry(privdata, &(kmem_sync->handle))) == NULL) return -EINVAL; /* kmem_handle is not valid */ + + spin_lock(&(privdata->kmemlist_lock)); + privdata->kmem_last_sync = kmem_entry; + spin_unlock(&(privdata->kmemlist_lock)); + } return pcidriver_kmem_sync_entry(privdata, kmem_entry, kmem_sync->dir); } @@ -466,6 +494,8 @@ int pcidriver_kmem_free_entry(pcidriver_privdata_t *privdata, pcidriver_kmem_ent /* Remove the kmem list entry */ spin_lock( &(privdata->kmemlist_lock) ); + if (privdata->kmem_last_sync == kmem_entry) + privdata->kmem_last_sync = NULL; list_del( &(kmem_entry->list) ); spin_unlock( &(privdata->kmemlist_lock) ); |