[PATCH v2 3/5] scsi: elx: efct: free the request tag when the send frame WQE fails

[Ali Ahmet Memis <ali@iusegentoo.com>]

efct_hw_send_frame() takes a request tag from the pool and then builds the
WQE. When sli_send_frame_wqe() fails it returns without giving the tag
back:

	ctx->wqcb = efct_hw_reqtag_alloc(hw, callback, arg);
	if (!ctx->wqcb) {
		efc_log_err(hw->os, "can't allocate request tag\n");
		return -ENOSPC;
	}
	...
	if (rc) {
		efc_log_err(hw->os, "sli_send_frame_wqe failed: %d\n", rc);
		return -EIO;
	}

Nothing is submitted, so the completion that would call
efct_hw_reqtag_free() never runs and the tag stays out of the pool. The
pool is bounded by the number of request tags allocated at init, so
repeated failures leave send frame without any.

Free the tag on that path. The efct_hw_wq_write() failure below is left
alone: it can return an error while this request is still queued on
wq->pending_list, and the tag is what a later completion would look the
context up by.

Fixes: dd53d333aadb ("scsi: elx: efct: Hardware I/O submission routines")
Signed-off-by: Ali Ahmet Memis <ali@iusegentoo.com>
---
 drivers/scsi/elx/efct/efct_hw.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/elx/efct/efct_hw.c b/drivers/scsi/elx/efct/efct_hw.c
index 6cc48fa3e656..db68516e8075 100644
--- a/drivers/scsi/elx/efct/efct_hw.c
+++ b/drivers/scsi/elx/efct/efct_hw.c
@@ -3009,6 +3009,7 @@ efct_hw_send_frame(struct efct_hw *hw, struct fc_frame_header *hdr,
 				ctx->wqcb->instance_index);
 	if (rc) {
 		efc_log_err(hw->os, "sli_send_frame_wqe failed: %d\n", rc);
+		efct_hw_reqtag_free(hw, ctx->wqcb);
 		return -EIO;
 	}
 
-- 
2.55.0