The conclusion of a recent discussion about the new warnings reported by gcc 7 is that the new warnings reported when building with W=1 should be suppressed. However, gcc 7 still warns about fall-through in switch statements when building with W=1. Suppress these warnings by annotating the SCSI core properly. See also Linus Torvalds, Lots of new warnings with gcc-7.1.1, 11 July 2017 (https://www.mail-archive.com/linux-media@xxxxxxxxxxxxxxx/msg115428.html). References: commit bd664f6b3e37 ("disable new gcc-7.1.1 warnings for now") Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Cc: Hannes Reinecke <hare@xxxxxxxx> Cc: Johannes Thumshirn <jthumshirn@xxxxxxx> --- drivers/scsi/scsi_error.c | 8 +++++++- drivers/scsi/scsi_ioctl.c | 4 +++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index ea9f40e51f68..01b2d2055edf 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -552,6 +552,7 @@ int scsi_check_sense(struct scsi_cmnd *scmd) set_host_byte(scmd, DID_ALLOC_FAILURE); return SUCCESS; } + /* FALLTHROUGH */ case COPY_ABORTED: case VOLUME_OVERFLOW: case MISCOMPARE: @@ -573,6 +574,7 @@ int scsi_check_sense(struct scsi_cmnd *scmd) return ADD_TO_MLQUEUE; else set_host_byte(scmd, DID_TARGET_FAILURE); + /* FALLTHROUGH */ case ILLEGAL_REQUEST: if (sshdr.asc == 0x20 || /* Invalid command operation code */ @@ -683,6 +685,7 @@ static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) switch (status_byte(scmd->result)) { case GOOD: scsi_handle_queue_ramp_up(scmd->device); + /* FALLTHROUGH */ case COMMAND_TERMINATED: return SUCCESS; case CHECK_CONDITION: @@ -1734,6 +1737,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd) set_host_byte(scmd, DID_TIME_OUT); return SUCCESS; } + /* FALLTHROUGH */ case DID_NO_CONNECT: case DID_BAD_TARGET: /* @@ -1819,6 +1823,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd) * the case of trying to send too many commands to a * tagged queueing device. */ + /* FALLTHROUGH */ case BUSY: /* * device can't talk to us at the moment. Should only @@ -1831,6 +1836,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd) if (scmd->cmnd[0] == REPORT_LUNS) scmd->device->sdev_target->expecting_lun_change = 0; scsi_handle_queue_ramp_up(scmd->device); + /* FALLTHROUGH */ case COMMAND_TERMINATED: return SUCCESS; case TASK_ABORTED: @@ -2320,8 +2326,8 @@ scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) rtn = scsi_try_host_reset(scmd); if (rtn == SUCCESS) break; - default: /* FALLTHROUGH */ + default: rtn = FAILED; break; } diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c index b6bf3f29a12a..0a875491f5a7 100644 --- a/drivers/scsi/scsi_ioctl.c +++ b/drivers/scsi/scsi_ioctl.c @@ -116,13 +116,15 @@ static int ioctl_internal_command(struct scsi_device *sdev, char *cmd, case NOT_READY: /* This happens if there is no disc in drive */ if (sdev->removable) break; + /* FALLTHROUGH */ case UNIT_ATTENTION: if (sdev->removable) { sdev->changed = 1; result = 0; /* This is no longer considered an error */ break; } - default: /* Fall through for non-removable media */ + /* FALLTHROUGH -- for non-removable media */ + default: sdev_printk(KERN_INFO, sdev, "ioctl_internal_command return code = %x\n", result); -- 2.14.1
