[PATCH v4 15/31] net/ena/base: restructure interrupt handling

[shaibran at amazon.com]

From: Shai Brandes <shaibran at amazon.com>

When invoking an admin command, in interrupt mode, if the interrupt
is received after timeout and also after the calling function finished
running, the response will be written into a memory that is no longer
valid.

Signed-off-by: Shai Brandes <shaibran at amazon.com>
Reviewed-by: Amit Bernstein <amitbern at amazon.com>
---
 drivers/net/ena/base/ena_com.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ena/base/ena_com.c b/drivers/net/ena/base/ena_com.c
index fb3ad27d0a..a0c88b1a0e 100644
--- a/drivers/net/ena/base/ena_com.c
+++ b/drivers/net/ena/base/ena_com.c
@@ -181,6 +181,7 @@ static int ena_com_admin_init_aenq(struct ena_com_dev *ena_dev,
 static void comp_ctxt_release(struct ena_com_admin_queue *queue,
 				     struct ena_comp_ctx *comp_ctx)
 {
+	comp_ctx->user_cqe = NULL;
 	comp_ctx->occupied = false;
 	ATOMIC32_DEC(&queue->outstanding_cmds);
 }
@@ -474,6 +475,9 @@ static void ena_com_handle_single_admin_completion(struct ena_com_admin_queue *a
 		return;
 	}
 
+	if (!comp_ctx->occupied)
+		return;
+
 	comp_ctx->status = ENA_CMD_COMPLETED;
 	comp_ctx->comp_status = cqe->acq_common_descriptor.status;
 
-- 
2.17.1