From 6320377fd94316e58f75d0be6f6e7a644950a4ee Mon Sep 17 00:00:00 2001 From: Olaf Kirch Date: Thu, 13 Dec 2007 12:43:25 -0600 Subject: [PATCH] [SCSI] libiscsi, iscsi_tcp: iscsi pool cleanup 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 Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- 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 491845f187..f79a457099 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 eb3784f949..d49d87611e 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 59365864c9..d43f909a02 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 a9a9e86918..4b3e3c1512 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. -- 2.39.5