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authorNicholas Bellinger <nab@linux-iscsi.org>2013-09-23 11:57:38 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-10-01 21:27:31 -0700
commit8c7f6e9b3321f5ede7f33974cad06db224661a42 (patch)
treebe7a59b7c74b0ec9b5ac6c86c3276bad311ff823
parent4a47d3a1ff10e564bf04f27ac14552df64f60cdf (diff)
downloadlinux-stericsson-8c7f6e9b3321f5ede7f33974cad06db224661a42.tar.gz
target: Fall back to vzalloc upon ->sess_cmd_map kzalloc failure
This patch changes transport_alloc_session_tags() to fall back to use vzalloc when kzalloc fails for big tag_num that end up generating larger order allocations. Also use is_vmalloc_addr() in transport_alloc_session_tags() failure path, and normal transport_free_session() path to determine when vfree() needs to be called instead of kfree(). v2 changes: - Use __GFP_NOWARN | __GFP_REPEAT for sess_cmd_map kzalloc (mst) Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Asias He <asias@redhat.com> Cc: Kent Overstreet <kmo@daterainc.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r--drivers/target/target_core_transport.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 84747cc1aac0..81e945eefbbd 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -236,17 +236,24 @@ int transport_alloc_session_tags(struct se_session *se_sess,
{
int rc;
- se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
+ se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
+ GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
if (!se_sess->sess_cmd_map) {
- pr_err("Unable to allocate se_sess->sess_cmd_map\n");
- return -ENOMEM;
+ se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
+ if (!se_sess->sess_cmd_map) {
+ pr_err("Unable to allocate se_sess->sess_cmd_map\n");
+ return -ENOMEM;
+ }
}
rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
if (rc < 0) {
pr_err("Unable to init se_sess->sess_tag_pool,"
" tag_num: %u\n", tag_num);
- kfree(se_sess->sess_cmd_map);
+ if (is_vmalloc_addr(se_sess->sess_cmd_map))
+ vfree(se_sess->sess_cmd_map);
+ else
+ kfree(se_sess->sess_cmd_map);
se_sess->sess_cmd_map = NULL;
return -ENOMEM;
}
@@ -412,7 +419,10 @@ void transport_free_session(struct se_session *se_sess)
{
if (se_sess->sess_cmd_map) {
percpu_ida_destroy(&se_sess->sess_tag_pool);
- kfree(se_sess->sess_cmd_map);
+ if (is_vmalloc_addr(se_sess->sess_cmd_map))
+ vfree(se_sess->sess_cmd_map);
+ else
+ kfree(se_sess->sess_cmd_map);
}
kmem_cache_free(se_sess_cache, se_sess);
}