[PATCH][next] igc: remove redundant continue statement

[PATCH][next] igc: remove redundant continue statement

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

The continue statement at the end of a for-loop has no effect,
remove it.

Addresses-Coverity: ("Continue has no effect")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/ethernet/intel/igc/igc_ptp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 0f021909b430..b615a980f563 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -860,7 +860,6 @@ static int igc_phc_get_syncdevicetime(ktime_t *device,
 			 * so write the previous error status to clear it.
 			 */
 			wr32(IGC_PTM_STAT, stat);
-			continue;
 		}
 	} while (--count);
 
-- 
2.32.0

Re: [PATCH][next] igc: remove redundant continue statement

[Joe Perches]

On Sun, 2021-08-29 at 17:51 +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> The continue statement at the end of a for-loop has no effect,
> remove it.

There seem to be a few of this type of use in the kernel.

Many are in switch {} default: continue uses inside loops where there
is no additional statement after the switch statement ends.

The continue is obviously safe and even perhaps preferred as statements
_might_ be added after the switch end or test/continue use.

But perhaps those should be converted to break;

For instance: drivers/gpu/drm/zte/zx_vou.c

static void zx_overlay_init(struct drm_device *drm, struct zx_vou_hw *vou)
{
	struct device *dev = vou->dev;
	struct zx_plane *zplane;
	int i;
	int ret;

	/*
	 * VL0 has some quirks on scaling support which need special handling.
	 * Let's leave it out for now.
	 */
	for (i = 1; i < VL_NUM; i++) {
		zplane = devm_kzalloc(dev, sizeof(*zplane), GFP_KERNEL);
		if (!zplane) {
			DRM_DEV_ERROR(dev, "failed to allocate zplane %d\n", i);
			return;
		}

		zplane->layer = vou->osd + OSD_VL_OFFSET(i);
		zplane->hbsc = vou->osd + HBSC_VL_OFFSET(i);
		zplane->rsz = vou->otfppu + RSZ_VL_OFFSET(i);
		zplane->bits = &zx_vl_bits[i];

		ret = zx_plane_init(drm, zplane, DRM_PLANE_TYPE_OVERLAY);
		if (ret) {
			DRM_DEV_ERROR(dev, "failed to init overlay %d\n", i);
			continue;
		}
	}
}

Here's a grep using grep version 2.5.4 that finds these
(with some false positives)

$ grep-2.5.4 -rP --include=*.[ch] -n '\t{3,3}continue;\n\t{2,2}\}\n\t{1,1}\}' *
arch/x86/events/intel/core.c:3408:			continue;
		}
	}
arch/arm/mach-at91/pm.c:801:			continue;
		}
	}
arch/powerpc/xmon/xmon.c:973:			continue;
		}
	}
arch/powerpc/platforms/ps3/mm.c:450:			continue;
		}
	}
arch/powerpc/platforms/powernv/opal-irqchip.c:286:			continue;
		}
	}
drivers/net/vxlan.c:807:			continue;
		}
	}
drivers/net/hamradio/6pack.c:450:			continue;
		}
	}
drivers/net/wireless/ath/ath11k/mac.c:5369:			continue;
		}
	}
drivers/net/wireless/ath/ath11k/mac.c:5403:			continue;
		}
	}
drivers/net/wireless/ath/ath10k/mac.c:8646:			continue;
		}
	}
drivers/net/wireless/ath/ath10k/mac.c:8687:			continue;
		}
	}
drivers/net/geneve.c:513:			continue;
		}
	}
drivers/net/ethernet/ti/netcp_core.c:331:			continue;
		}
	}
drivers/net/ethernet/neterion/s2io.c:1392:			continue;
		}
	}
drivers/net/ethernet/toshiba/ps3_gelic_wireless.c:1722:				continue;
		}
	}
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:1633:			continue;
		}
	}
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c:9386:				continue;
		}
	}
drivers/target/iscsi/iscsi_target_erl1.c:341:			continue;
		}
	}
drivers/cpufreq/powernow-k8.c:848:			continue;
		}
	}
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3179:			continue;
		}
	}
drivers/iommu/intel/iommu.c:3082:			continue;
		}
	}
drivers/soc/ti/knav_qmss_queue.c:724:			continue;
		}
	}
drivers/mmc/host/vub300.c:561:			continue;
		}
	}
drivers/mmc/host/vub300.c:1885:			continue;
		}
	}
drivers/staging/rtl8188eu/core/rtw_efuse.c:552:			continue;
		}
	}
drivers/staging/greybus/audio_helper.c:184:			continue;
		}
	}
drivers/block/rbd.c:2443:			continue;
		}
	}
drivers/clk/sunxi/clk-sun8i-bus-gates.c:89:			continue;
		}
	}
drivers/clk/sunxi/clk-mod0.c:348:			continue;
		}
	}
drivers/pci/controller/pci-hyperv.c:2056:			continue;
		}
	}
drivers/scsi/mvumi.c:1595:				continue;
		}
	}
drivers/scsi/fnic/fnic_fcs.c:654:			continue;
		}
	}
drivers/scsi/qla4xxx/ql4_os.c:2795:			continue;
		}
	}
drivers/scsi/megaraid/megaraid_mm.c:545:			continue;
		}
	}
drivers/scsi/libsas/sas_expander.c:1202:			continue;
		}
	}
drivers/usb/typec/tcpm/tcpm.c:3236:			continue;
		}
	}
drivers/usb/host/fotg210-hcd.c:504:			continue;
		}
	}
drivers/usb/host/ehci-dbg.c:610:			continue;
		}
	}
drivers/usb/host/ohci-at91.c:549:			continue;
		}
	}
drivers/usb/serial/mos7840.c:539:			continue;
		}
	}
drivers/zorro/zorro.c:212:			continue;
		}
	}
drivers/iio/dac/ad5592r-base.c:561:			continue;
		}
	}
drivers/infiniband/hw/hfi1/init.c:1023:				continue;
		}
	}
drivers/char/agp/isoch.c:377:				continue;
		}
	}
drivers/gpu/drm/zte/zx_vou.c:666:			continue;
		}
	}
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:10133:			continue;
		}
	}
drivers/gpu/drm/nouveau/nvkm/subdev/i2c/base.c:360:			continue;
		}
	}
drivers/tty/serial/jsm/jsm_neo.c:1227:			continue;
		}
	}
drivers/platform/x86/sony-laptop.c:1413:			continue;
		}
	}
drivers/platform/x86/sony-laptop.c:1494:			continue;
		}
	}
drivers/platform/x86/sony-laptop.c:1532:			continue;
		}
	}
drivers/spi/spi-fsi.c:438:			continue;
		}
	} while (seq_state && (seq_state != SPI_FSI_STATUS_SEQ_STATE_IDLE));
drivers/comedi/drivers/ni_usb6501.c:497:			continue;
		}
	}
drivers/comedi/drivers/vmk80xx.c:663:			continue;
		}
	}
drivers/video/fbdev/core/fbcon.c:508:			continue;
		}
	}
drivers/mtd/ubi/block.c:640:			continue;
		}
	}
drivers/mtd/nand/raw/davinci_nand.c:337:			continue;
		}
	}
drivers/mtd/parsers/bcm47xxpart.c:248:			continue;
		}
	}
drivers/nvdimm/badrange.c:158:			continue;
		}
	}
drivers/isdn/hardware/mISDN/hfcsusb.c:1927:			continue;
		}
	}
drivers/input/joystick/grip.c:316:			continue;
		}
	}
drivers/greybus/interface.c:1148:			continue;
		}
	}
drivers/i2c/busses/i2c-powermac.c:366:			continue;
		}
	}
drivers/pinctrl/pinctrl-zynq.c:1101:			continue;
		}
	}
drivers/pinctrl/pinctrl-at91-pio4.c:895:			continue;
		}
	}
drivers/bluetooth/btusb.c:1658:			continue;
		}
	}
drivers/bluetooth/btusb.c:4302:			continue;
		}
	}
drivers/bluetooth/btusb.c:4519:			continue;
		}
	}
drivers/acpi/processor_perflib.c:617:			continue;
		}
	}
drivers/leds/leds-da9052.c:139:			continue;
		}
	}
fs/xfs/libxfs/xfs_sb.c:906:			continue;
		}
	}
fs/9p/v9fs.c:369:			continue;
		}
	}
fs/unicode/mkutf8data.c:1972:			continue;
		}
	}
fs/unicode/mkutf8data.c:2032:			continue;
		}
	}
fs/unicode/mkutf8data.c:2087:			continue;
		}
	}
fs/unicode/mkutf8data.c:2285:			continue;
		}
	}
fs/ocfs2/buffer_head_io.c:332:			continue;
		}
	}
kernel/bpf/syscall.c:3432:			continue;
		}
	}
kernel/range.c:109:			continue;
		}
	}
kernel/trace/trace_events.c:2626:			continue;
		}
	}
lib/test_rhashtable.c:437:				continue;
		}
	}
net/dsa/dsa2.c:831:			continue;
		}
	}
net/wireless/util.c:942:			continue;
		}
	}
net/9p/client.c:214:			continue;
		}
	}
net/9p/trans_fd.c:805:			continue;
		}
	}
net/9p/trans_rdma.c:232:			continue;
		}
	}
net/ipv4/fou.c:422:			continue;
		}
	}
net/ipv4/udp_offload.c:557:			continue;
		}
	}
net/ethernet/eth.c:438:			continue;
		}
	}
net/tipc/name_distr.c:358:			continue;
		}
	}
samples/seccomp/bpf-helper.c:57:			continue;
		}
	}
tools/perf/builtin-script.c:3106:			continue;
		}
	}
tools/perf/util/parse-events.c:505:				continue;
		}
	}
tools/perf/util/jitdump.c:708:			continue;
		}
	}
tools/perf/ui/browsers/hists.c:3543:			continue;
		}
	}
tools/testing/radix-tree/regression3.c:54:			continue;
		}
	}
tools/testing/radix-tree/regression3.c:67:			continue;
		}
	}
tools/testing/selftests/net/mptcp/mptcp_connect.c:371:			continue;
		}
	}
tools/testing/selftests/net/timestamping.c:546:			continue;
		}
	}
tools/testing/selftests/powerpc/nx-gzip/gzip_vas.c:252:			continue;
		}
	}
tools/power/cpupower/lib/cpupower.c:177:			continue;
		}
	}
tools/lib/bpf/libbpf.c:7417:			continue;
		}
	}
tools/lib/bpf/btf.c:928:			continue;
		}
	}
tools/lib/bpf/linker.c:835:			continue;
		}
	}

Re: [PATCH][next] igc: remove redundant continue statement

[Vinicius Costa Gomes]

Colin King <colin.king@canonical.com> writes:

> From: Colin Ian King <colin.king@canonical.com>
>
> The continue statement at the end of a for-loop has no effect,
> remove it.
>
> Addresses-Coverity: ("Continue has no effect")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/net/ethernet/intel/igc/igc_ptp.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
> index 0f021909b430..b615a980f563 100644
> --- a/drivers/net/ethernet/intel/igc/igc_ptp.c
> +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
> @@ -860,7 +860,6 @@ static int igc_phc_get_syncdevicetime(ktime_t *device,
>  			 * so write the previous error status to clear it.
>  			 */
>  			wr32(IGC_PTM_STAT, stat);
> -			continue;

Just a bit of background.

I added the "continue" here more as documentation: we handled an error,
and we want to try again, I felt that the continue helps making that
clearer.

But I am not completely opposed about removing it.

>  		}
>  	} while (--count);
>  
> -- 
> 2.32.0
>

Cheers,
-- 
Vinicius