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| author | Jitendra Bhivare <jitendra.bhivare@broadcom.com> | 2016-12-13 15:55:58 +0530 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-01-05 00:21:13 -0500 |
| commit | 3f7f62ee5b10de42b3ff1a33599fde4a2094960a (patch) | |
| tree | d2e7b2bfcef7dbe0a74c3d67ee940f7015dcba35 | |
| parent | 392b7d2f122210da594671606321223167a5a85c (diff) | |
| download | linux-3f7f62ee5b10de42b3ff1a33599fde4a2094960a.tar.gz linux-3f7f62ee5b10de42b3ff1a33599fde4a2094960a.tar.bz2 linux-3f7f62ee5b10de42b3ff1a33599fde4a2094960a.zip | |
scsi: be2iscsi: Add checks to validate completions
Added check in beiscsi_process_cq for pio_handle.
pio_handle is cleared in beiscsi_put_wrb_handle.
This catches any case where task gets cleaned up just before completion.
Use back_lock before accessing pio_handle.
Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/be2iscsi/be_main.c | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c index b509acd33772..832d4f0fb33f 100644 --- a/drivers/scsi/be2iscsi/be_main.c +++ b/drivers/scsi/be2iscsi/be_main.c @@ -960,6 +960,10 @@ beiscsi_get_wrb_handle(struct hwi_wrb_context *pwrb_context, unsigned long flags; spin_lock_irqsave(&pwrb_context->wrb_lock, flags); + if (!pwrb_context->wrb_handles_available) { + spin_unlock_irqrestore(&pwrb_context->wrb_lock, flags); + return NULL; + } pwrb_handle = pwrb_context->pwrb_handle_base[pwrb_context->alloc_index]; pwrb_context->wrb_handles_available--; if (pwrb_context->alloc_index == (wrbs_per_cxn - 1)) @@ -1010,6 +1014,7 @@ beiscsi_put_wrb_handle(struct hwi_wrb_context *pwrb_context, pwrb_context->free_index = 0; else pwrb_context->free_index++; + pwrb_handle->pio_handle = NULL; spin_unlock_irqrestore(&pwrb_context->wrb_lock, flags); } @@ -1220,6 +1225,7 @@ hwi_complete_drvr_msgs(struct beiscsi_conn *beiscsi_conn, uint16_t wrb_index, cid, cri_index; struct hwi_controller *phwi_ctrlr; struct wrb_handle *pwrb_handle; + struct iscsi_session *session; struct iscsi_task *task; phwi_ctrlr = phba->phwi_ctrlr; @@ -1238,8 +1244,12 @@ hwi_complete_drvr_msgs(struct beiscsi_conn *beiscsi_conn, cri_index = BE_GET_CRI_FROM_CID(cid); pwrb_context = &phwi_ctrlr->wrb_context[cri_index]; pwrb_handle = pwrb_context->pwrb_handle_basestd[wrb_index]; + session = beiscsi_conn->conn->session; + spin_lock_bh(&session->back_lock); task = pwrb_handle->pio_handle; - iscsi_put_task(task); + if (task) + __iscsi_put_task(task); + spin_unlock_bh(&session->back_lock); } static void @@ -1319,16 +1329,16 @@ static void adapter_get_sol_cqe(struct beiscsi_hba *phba, static void hwi_complete_cmd(struct beiscsi_conn *beiscsi_conn, struct beiscsi_hba *phba, struct sol_cqe *psol) { + struct iscsi_conn *conn = beiscsi_conn->conn; + struct iscsi_session *session = conn->session; + struct common_sol_cqe csol_cqe = {0}; struct hwi_wrb_context *pwrb_context; + struct hwi_controller *phwi_ctrlr; struct wrb_handle *pwrb_handle; struct iscsi_wrb *pwrb = NULL; - struct hwi_controller *phwi_ctrlr; struct iscsi_task *task; - unsigned int type; - struct iscsi_conn *conn = beiscsi_conn->conn; - struct iscsi_session *session = conn->session; - struct common_sol_cqe csol_cqe = {0}; uint16_t cri_index = 0; + uint8_t type; phwi_ctrlr = phba->phwi_ctrlr; @@ -1341,11 +1351,15 @@ static void hwi_complete_cmd(struct beiscsi_conn *beiscsi_conn, pwrb_handle = pwrb_context->pwrb_handle_basestd[ csol_cqe.wrb_index]; + spin_lock_bh(&session->back_lock); task = pwrb_handle->pio_handle; + if (!task) { + spin_unlock_bh(&session->back_lock); + return; + } pwrb = pwrb_handle->pwrb; type = ((struct beiscsi_io_task *)task->dd_data)->wrb_type; - spin_lock_bh(&session->back_lock); switch (type) { case HWH_TYPE_IO: case HWH_TYPE_IO_RD: |