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-rw-r--r--net/ceph/messenger.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index b5536e4e39a1..e86bb3f14859 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -44,13 +44,16 @@ static void con_work(struct work_struct *);
static void ceph_fault(struct ceph_connection *con);
/*
- * nicely render a sockaddr as a string.
+ * Nicely render a sockaddr as a string. An array of formatted
+ * strings is used, to approximate reentrancy.
*/
-#define MAX_ADDR_STR 20
-#define MAX_ADDR_STR_LEN 60
-static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
-static DEFINE_SPINLOCK(addr_str_lock);
-static int last_addr_str;
+#define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */
+#define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG)
+#define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1)
+#define MAX_ADDR_STR_LEN 64 /* 54 is enough */
+
+static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN];
+static atomic_t addr_str_seq = ATOMIC_INIT(0);
static struct page *zero_page; /* used in certain error cases */
static void *zero_page_address; /* kernel virtual addr of zero_page */
@@ -62,11 +65,7 @@ const char *ceph_pr_addr(const struct sockaddr_storage *ss)
struct sockaddr_in *in4 = (void *)ss;
struct sockaddr_in6 *in6 = (void *)ss;
- spin_lock(&addr_str_lock);
- i = last_addr_str++;
- if (last_addr_str == MAX_ADDR_STR)
- last_addr_str = 0;
- spin_unlock(&addr_str_lock);
+ i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK;
s = addr_str[i];
switch (ss->ss_family) {