From: Mike Christie <michaelc@xxxxxxxxxxx>
from olaf.kirch@xxxxxxxxxx
iscsi_pool_init simplified
iscsi_pool_init currently has a lot of duplicate kfree() calls it does
when some allocation fails. This patch simplifies the code a little by
using iscsi_pool_free to tear down the pool in case of an error.
iscsi_pool_init also returns a copy of the item array to the caller.
Not all callers use this array, so we make it optional.
Instead of allocating a second array and return that, allocate just one
array, of twice the size.
Update users of iscsi_pool_{init,free}
This patch drops the (now useless) second argument to
iscsi_pool_free, and updates all callers.
It also removes the ctask->r2ts array, which was never
used anyway. Since the items argument to iscsi_pool_init
is now optional, we can pass NULL instead.
Signed-off-by: Olaf Kirch <olaf.kirch@xxxxxxxxxx>
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/iscsi_tcp.c | 12 ++-----
drivers/scsi/iscsi_tcp.h | 3 +-
drivers/scsi/libiscsi.c | 75 ++++++++++++++++++++++++---------------------
include/scsi/libiscsi.h | 10 +++---
4 files changed, 50 insertions(+), 50 deletions(-)
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 491845f..f79a457 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1998,8 +1998,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
*/
/* R2T pool */
- if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
- (void***)&tcp_ctask->r2ts,
+ if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, NULL,
sizeof(struct iscsi_r2t_info))) {
goto r2t_alloc_fail;
}
@@ -2008,8 +2007,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
tcp_ctask->r2tqueue = kfifo_alloc(
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
+ iscsi_pool_free(&tcp_ctask->r2tpool);
goto r2t_alloc_fail;
}
}
@@ -2022,8 +2020,7 @@ r2t_alloc_fail:
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
kfifo_free(tcp_ctask->r2tqueue);
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
+ iscsi_pool_free(&tcp_ctask->r2tpool);
}
return -ENOMEM;
}
@@ -2038,8 +2035,7 @@ iscsi_r2tpool_free(struct iscsi_session *session)
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
kfifo_free(tcp_ctask->r2tqueue);
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
+ iscsi_pool_free(&tcp_ctask->r2tpool);
}
}
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index eb3784f..d49d876 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -175,9 +175,8 @@ struct iscsi_tcp_cmd_task {
uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
int data_offset;
struct iscsi_r2t_info *r2t; /* in progress R2T */
- struct iscsi_queue r2tpool;
+ struct iscsi_pool r2tpool;
struct kfifo *r2tqueue;
- struct iscsi_r2t_info **r2ts;
int digest_count;
uint32_t immdigest; /* for imm data */
struct iscsi_buf immbuf; /* for imm data digest */
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 5936586..d43f909 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1413,59 +1413,64 @@ done:
}
EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
+/*
+ * Pre-allocate a pool of @max items of @item_size. By default, the pool
+ * should be accessed via kfifo_{get,put} on q->queue.
+ * Optionally, the caller can obtain the array of object pointers
+ * by passing in a non-NULL @items pointer
+ */
int
-iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
+iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
{
- int i;
+ int i, num_arrays = 1;
- *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (*items == NULL)
- return -ENOMEM;
+ memset(q, 0, sizeof(*q));
q->max = max;
- q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (q->pool == NULL) {
- kfree(*items);
- return -ENOMEM;
- }
+
+ /* If the user passed an items pointer, he wants a copy of
+ * the array. */
+ if (items)
+ num_arrays++;
+ q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
+ if (q->pool == NULL)
+ goto enomem;
q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
GFP_KERNEL, NULL);
- if (q->queue == ERR_PTR(-ENOMEM)) {
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
- }
+ if (q->queue == ERR_PTR(-ENOMEM))
+ goto enomem;
for (i = 0; i < max; i++) {
- q->pool[i] = kmalloc(item_size, GFP_KERNEL);
+ q->pool[i] = kzalloc(item_size, GFP_KERNEL);
if (q->pool[i] == NULL) {
- int j;
-
- for (j = 0; j < i; j++)
- kfree(q->pool[j]);
-
- kfifo_free(q->queue);
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
+ q->max = i;
+ goto enomem;
}
- memset(q->pool[i], 0, item_size);
- (*items)[i] = q->pool[i];
__kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
}
+
+ if (items) {
+ *items = q->pool + max;
+ memcpy(*items, q->pool, max * sizeof(void *));
+ }
+
return 0;
+
+enomem:
+ iscsi_pool_free(q);
+ return -ENOMEM;
}
EXPORT_SYMBOL_GPL(iscsi_pool_init);
-void iscsi_pool_free(struct iscsi_queue *q, void **items)
+void iscsi_pool_free(struct iscsi_pool *q)
{
int i;
for (i = 0; i < q->max; i++)
- kfree(items[i]);
- kfree(q->pool);
- kfree(items);
+ kfree(q->pool[i]);
+ if (q->pool)
+ kfree(q->pool);
}
EXPORT_SYMBOL_GPL(iscsi_pool_free);
@@ -1610,9 +1615,9 @@ module_put:
cls_session_fail:
scsi_remove_host(shost);
add_host_fail:
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
+ iscsi_pool_free(&session->mgmtpool);
mgmtpool_alloc_fail:
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+ iscsi_pool_free(&session->cmdpool);
cmdpool_alloc_fail:
scsi_host_put(shost);
return NULL;
@@ -1635,8 +1640,8 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
iscsi_unblock_session(cls_session);
scsi_remove_host(shost);
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+ iscsi_pool_free(&session->mgmtpool);
+ iscsi_pool_free(&session->cmdpool);
kfree(session->password);
kfree(session->password_in);
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index a9a9e86..4b3e3c1 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -215,7 +215,7 @@ struct iscsi_conn {
uint32_t eh_abort_cnt;
};
-struct iscsi_queue {
+struct iscsi_pool {
struct kfifo *queue; /* FIFO Queue */
void **pool; /* Pool of elements */
int max; /* Max number of elements */
@@ -274,10 +274,10 @@ struct iscsi_session {
int cmds_max; /* size of cmds array */
struct iscsi_cmd_task **cmds; /* Original Cmds arr */
- struct iscsi_queue cmdpool; /* PDU's pool */
+ struct iscsi_pool cmdpool; /* PDU's pool */
int mgmtpool_max; /* size of mgmt array */
struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
- struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */
+ struct iscsi_pool mgmtpool; /* Mgmt PDU's pool */
};
/*
@@ -350,8 +350,8 @@ extern void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask);
/*
* generic helpers
*/
-extern void iscsi_pool_free(struct iscsi_queue *, void **);
-extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);
+extern void iscsi_pool_free(struct iscsi_pool *);
+extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
/*
* inline functions to deal with padding.
--
1.5.1.2
-
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