scsi: qedf: Correct the memory barriers in qedf_ring_doorbell (90ccf757) · Commits · 戴 / test

- Correct memory barriers to make sure all cmnds are flushed. Signed-off-by:

drivers/scsi/qedf/qedf_io.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -773,10 +773,18 @@ void qedf_ring_doorbell(struct qedf_rport *fcport)
		FCOE_DB_DATA_AGG_VAL_SEL_SHIFT;

		dbell.sq_prod = fcport->fw_sq_prod_idx;
		/* wmb makes sure that the BDs data is updated before updating the
		* producer, otherwise FW may read old data from the BDs.
		*/
		wmb();
		barrier();
		writel((u32 )&dbell, fcport->p_doorbell);
		/* Make sure SQ index is updated so f/w prcesses requests in order */
		/*
		* Fence required to flush the write combined buffer, since another
		* CPU may write to the same doorbell address and data may be lost
		* due to relaxed order nature of write combined bar.
		*/
		wmb();
		mmiowb();
		}

		static void qedf_trace_io(struct qedf_rport fcport, struct qedf_ioreq io_req,