Commit 8d5944d8 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Doug Ledford

IB/iser: Fix possible bogus DMA unmapping

If iser_initialize_task_headers() routine failed before
dma mapping, we should not attempt to unmap in cleanup_task().

Fixes: 7414dde0 (IB/iser: Fix race between iser connection ...)
Signed-off-by: default avatarSagi Grimberg <sagig@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 02816a8b
......@@ -200,6 +200,7 @@ iser_initialize_task_headers(struct iscsi_task *task,
goto out;
}
tx_desc->mapped = true;
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
......@@ -367,8 +368,11 @@ static void iscsi_iser_cleanup_task(struct iscsi_task *task)
if (!device)
return;
ib_dma_unmap_single(device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
if (likely(tx_desc->mapped)) {
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
tx_desc->mapped = false;
}
/* mgmt tasks do not need special cleanup */
if (!task->sc)
......
......@@ -270,6 +270,7 @@ enum iser_desc_type {
* sg[1] optionally points to either of immediate data
* unsolicited data-out or control
* @num_sge: number sges used on this TX task
* @mapped: Is the task header mapped
*/
struct iser_tx_desc {
struct iser_hdr iser_header;
......@@ -278,6 +279,7 @@ struct iser_tx_desc {
u64 dma_addr;
struct ib_sge tx_sg[2];
int num_sge;
bool mapped;
};
#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
......
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