scsi/qla1280: Remove stale comment about mmiowb()

All mmiowb() invocations have been removed, so there's no need to keep
banging on about it.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 0 insertions, 10 deletions

diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 93acbc5094f0..327eff67a1ee 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -3363,16 +3363,6 @@ qla1280_isp_cmd(struct scsi_qla_host *ha)
 
         /*
          * Update request index to mailbox4 (Request Queue In).
-         * The mmiowb() ensures that this write is ordered with writes by other
-         * CPUs.  Without the mmiowb(), it is possible for the following:
-         *    CPUA posts write of index 5 to mailbox4
-         *    CPUA releases host lock
-         *    CPUB acquires host lock
-         *    CPUB posts write of index 6 to mailbox4
-         *    On PCI bus, order reverses and write of 6 posts, then index 5,
-         *       causing chip to issue full queue of stale commands
-         * The mmiowb() prevents future writes from crossing the barrier.
-         * See Documentation/driver-api/device-io.rst for more information.
          */
         WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);