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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>
This commit is contained in:
Jitendra Bhivare 2016-12-13 15:55:58 +05:30 committed by Martin K. Petersen
parent 392b7d2f12
commit 3f7f62ee5b
1 changed files with 22 additions and 8 deletions
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30
drivers/scsi/be2iscsi/be_main.c
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@ -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 hwi_wrb_context *pwrb_context;
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};
struct hwi_wrb_context *pwrb_context;
struct hwi_controller *phwi_ctrlr;
struct wrb_handle *pwrb_handle;
struct iscsi_wrb *pwrb = NULL;
struct iscsi_task *task;
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: