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map_backing_store() would deadlock in error case for REGION_PRIVATE_MAP.

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Closes #1379.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21914 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2007-08-12 22:32:23 +00:00
parent d3ce129ef3
commit 5c806b5dbc
1 changed files with 7 additions and 1 deletions
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8
src/system/kernel/vm/vm.cpp
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@ -1000,6 +1000,7 @@ insert_area(vm_address_space *addressSpace, void **_address,
/*! You need to hold the lock of the cache and the write lock of the address
space when calling this function.
Note, that in case of error your cache will be temporarily unlocked.
*/
static status_t
map_backing_store(vm_address_space *addressSpace, vm_cache *cache,
@ -1022,6 +1023,7 @@ map_backing_store(vm_address_space *addressSpace, vm_cache *cache,
// if this is a private map, we need to create a new cache & store object
// pair to handle the private copies of pages as they are written to
vm_cache* sourceCache = cache;
if (mapping == REGION_PRIVATE_MAP) {
vm_cache *newCache;
vm_store *newStore;
@ -1091,9 +1093,13 @@ map_backing_store(vm_address_space *addressSpace, vm_cache *cache,
err2:
if (mapping == REGION_PRIVATE_MAP) {
// we created this cache, so we must delete it again
// We created this cache, so we must delete it again. Note, that we
// need to temporarily unlock the source cache or we'll otherwise
// deadlock, since vm_cache_remove_consumer will try to lock it too.
mutex_unlock(&cache->lock);
mutex_unlock(&sourceCache->lock);
vm_cache_release_ref(cache);
mutex_lock(&sourceCache->lock);
}
err1:
free(area->name);