Merge tag 'Wimplicit-fallthrough-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

Pull Wimplicit-fallthrough updates from Gustavo A. R. Silva:
 "Mark switch cases where we are expecting to fall through.

  This is part of the ongoing efforts to enable -Wimplicit-fallthrough.

  Most of them have been baking in linux-next for a whole development
  cycle. And with Stephen Rothwell's help, we've had linux-next
  nag-emails going out for newly introduced code that triggers
  -Wimplicit-fallthrough to avoid gaining more of these cases while we
  work to remove the ones that are already present.

  We are getting close to completing this work. Currently, there are
  only 32 of 2311 of these cases left to be addressed in linux-next. I'm
  auditing every case; I take a look into the code and analyze it in
  order to determine if I'm dealing with an actual bug or a false
  positive, as explained here:

      https://lore.kernel.org/lkml/c2fad584-1705-a5f2-d63c-824e9b96cf50@embeddedor.com/

  While working on this, I've found and fixed the several missing
  break/return bugs, some of them introduced more than 5 years ago.

  Once this work is finished, we'll be able to universally enable
  "-Wimplicit-fallthrough" to avoid any of these kinds of bugs from
  entering the kernel again"

* tag 'Wimplicit-fallthrough-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: (27 commits)
  memstick: mark expected switch fall-throughs
  drm/nouveau/nvkm: mark expected switch fall-throughs
  NFC: st21nfca: Fix fall-through warnings
  NFC: pn533: mark expected switch fall-throughs
  block: Mark expected switch fall-throughs
  ASN.1: mark expected switch fall-through
  lib/cmdline.c: mark expected switch fall-throughs
  lib: zstd: Mark expected switch fall-throughs
  scsi: sym53c8xx_2: sym_nvram: Mark expected switch fall-through
  scsi: sym53c8xx_2: sym_hipd: mark expected switch fall-throughs
  scsi: ppa: mark expected switch fall-through
  scsi: osst: mark expected switch fall-throughs
  scsi: lpfc: lpfc_scsi: Mark expected switch fall-throughs
  scsi: lpfc: lpfc_nvme: Mark expected switch fall-through
  scsi: lpfc: lpfc_nportdisc: Mark expected switch fall-through
  scsi: lpfc: lpfc_hbadisc: Mark expected switch fall-throughs
  scsi: lpfc: lpfc_els: Mark expected switch fall-throughs
  scsi: lpfc: lpfc_ct: Mark expected switch fall-throughs
  scsi: imm: mark expected switch fall-throughs
  scsi: csiostor: csio_wr: mark expected switch fall-through
  ...

10 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c
index d131cca999dd..10f2aa9f29a4 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c
@@ -23,38 +23,55 @@ void pack_hdmi_infoframe(struct packed_hdmi_infoframe *packed_frame,
 		 */
 	case 17:
 		subpack1_high = (raw_frame[16] << 16);
+		/* fall through */
 	case 16:
 		subpack1_high |= (raw_frame[15] << 8);
+		/* fall through */
 	case 15:
 		subpack1_high |= raw_frame[14];
+		/* fall through */
 	case 14:
 		subpack1_low = (raw_frame[13] << 24);
+		/* fall through */
 	case 13:
 		subpack1_low |= (raw_frame[12] << 16);
+		/* fall through */
 	case 12:
 		subpack1_low |= (raw_frame[11] << 8);
+		/* fall through */
 	case 11:
 		subpack1_low |= raw_frame[10];
+		/* fall through */
 	case 10:
 		subpack0_high = (raw_frame[9] << 16);
+		/* fall through */
 	case 9:
 		subpack0_high |= (raw_frame[8] << 8);
+		/* fall through */
 	case 8:
 		subpack0_high |= raw_frame[7];
+		/* fall through */
 	case 7:
 		subpack0_low = (raw_frame[6] << 24);
+		/* fall through */
 	case 6:
 		subpack0_low |= (raw_frame[5] << 16);
+		/* fall through */
 	case 5:
 		subpack0_low |= (raw_frame[4] << 8);
+		/* fall through */
 	case 4:
 		subpack0_low |= raw_frame[3];
+		/* fall through */
 	case 3:
 		header = (raw_frame[2] << 16);
+		/* fall through */
 	case 2:
 		header |= (raw_frame[1] << 8);
+		/* fall through */
 	case 1:
 		header |= raw_frame[0];
+		/* fall through */
 	case 0:
 		break;
 	}
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c
index 49ef7e57aad4..7f1adab21a5f 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c
@@ -122,6 +122,7 @@ nv04_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
 		break;
 	case NV_MEM_ACCESS_WO:
 		dmaobj->flags0 |= 0x00008000;
+		/* fall through */
 	case NV_MEM_ACCESS_RW:
 		dmaobj->flags2 |= 0x00000002;
 		break;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c
index ad707ff176cc..93493b335d76 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c
@@ -117,8 +117,10 @@ nv04_fifo_swmthd(struct nvkm_device *device, u32 chid, u32 addr, u32 data)
 	switch (mthd) {
 	case 0x0000 ... 0x0000: /* subchannel's engine -> software */
 		nvkm_wr32(device, 0x003280, (engine &= ~mask));
+		/* fall through */
 	case 0x0180 ... 0x01fc: /* handle -> instance */
 		data = nvkm_rd32(device, 0x003258) & 0x0000ffff;
+		/* fall through */
 	case 0x0100 ... 0x017c:
 	case 0x0200 ... 0x1ffc: /* pass method down to sw */
 		if (!(engine & mask) && sw)
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c
index 8c7ba32763c4..47c16821c37f 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c
@@ -81,6 +81,7 @@ nv40_fifo_init(struct nvkm_fifo *base)
 	case 0x49:
 	case 0x4b:
 		nvkm_wr32(device, 0x002230, 0x00000001);
+		/* fall through */
 	case 0x40:
 	case 0x41:
 	case 0x42:
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/perf.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/perf.c
index c3068358f695..7112992e0e38 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/perf.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/perf.c
@@ -135,6 +135,7 @@ nvbios_perfEp(struct nvkm_bios *bios, int idx,
 		break;
 	case 0x30:
 		info->script   = nvbios_rd16(bios, perf + 0x02);
+		/* fall through */
 	case 0x35:
 		info->fanspeed = nvbios_rd08(bios, perf + 0x06);
 		info->voltage  = nvbios_rd08(bios, perf + 0x07);
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/pll.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/pll.c
index e6e804cee2bc..bda6cc9a7aaf 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/pll.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/pll.c
@@ -134,6 +134,7 @@ pll_map(struct nvkm_bios *bios)
 		    device->chipset == 0xaa ||
 		    device->chipset == 0xac)
 			return g84_pll_mapping;
+		/* fall through */
 	default:
 		return NULL;
 	}
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
index ba6a868d4c95..40e564524b7a 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
@@ -90,6 +90,7 @@ nvkm_cstate_valid(struct nvkm_clk *clk, struct nvkm_cstate *cstate,
 			case NVKM_CLK_BOOST_NONE:
 				if (clk->base_khz && freq > clk->base_khz)
 					return false;
+				/* fall through */
 			case NVKM_CLK_BOOST_BIOS:
 				if (clk->boost_khz && freq > clk->boost_khz)
 					return false;
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/mcp77.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/mcp77.c
index 1c21b8b53b78..4f000237796f 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/mcp77.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/mcp77.c
@@ -363,6 +363,7 @@ mcp77_clk_prog(struct nvkm_clk *base)
 	switch (clk->vsrc) {
 	case nv_clk_src_cclk:
 		mast |= 0x00400000;
+		/* fall through */
 	default:
 		nvkm_wr32(device, 0x4600, clk->vdiv);
 	}
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv40.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv40.c
index 2b12e388f47a..5f4c287d7943 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv40.c
@@ -131,11 +131,13 @@ nv40_ram_prog(struct nvkm_ram *base)
 		nvkm_mask(device, 0x00402c, 0xc0771100, ram->ctrl);
 		nvkm_wr32(device, 0x004048, ram->coef);
 		nvkm_wr32(device, 0x004030, ram->coef);
+		/* fall through */
 	case 0x43:
 	case 0x49:
 	case 0x4b:
 		nvkm_mask(device, 0x004038, 0xc0771100, ram->ctrl);
 		nvkm_wr32(device, 0x00403c, ram->coef);
+		/* fall through */
 	default:
 		nvkm_mask(device, 0x004020, 0xc0771100, ram->ctrl);
 		nvkm_wr32(device, 0x004024, ram->coef);
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c
index 844971e5e874..2a6150ab5611 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/nv50.c
@@ -159,6 +159,7 @@ mxm_dcb_sanitise_entry(struct nvkm_bios *bios, void *data, int idx, u16 pdcb)
 		break;
 	case 0x0e: /* eDP, falls through to DPint */
 		ctx.outp[1] |= 0x00010000;
+		/* fall through */
 	case 0x07: /* DP internal, wtf is this?? HP8670w */
 		ctx.outp[1] |= 0x00000004; /* use_power_scripts? */
 		type = DCB_CONNECTOR_eDP;