[PATCH v2 2/2] drm: use mem_is_zero() instead of !memchr_inv(s, 0, n)

From: Jani Nikula
Date: Wed Aug 14 2024 - 06:02:48 EST


Use the mem_is_zero() helper where possible.

Conversion done using cocci:

| @@
| expression PTR;
| expression SIZE;
| @@
|
| <...
| (
| - memchr_inv(PTR, 0, SIZE) == NULL
| + mem_is_zero(PTR, SIZE)
| |
| - !memchr_inv(PTR, 0, SIZE)
| + mem_is_zero(PTR, SIZE)
| |
| - memchr_inv(PTR, 0, SIZE)
| + !mem_is_zero(PTR, SIZE)
| )
| ...>

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>

---

v2: Exclude GUID conversions, which are covered in [1].

[1] https://lore.kernel.org/r/20240812122312.1567046-1-jani.nikula@xxxxxxxxx

Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Andy Shevchenko <andy@xxxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 2 +-
drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
drivers/gpu/drm/i915/display/intel_opregion.c | 2 +-
drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 2 +-
drivers/gpu/drm/imagination/pvr_device.h | 2 +-
drivers/gpu/drm/udl/udl_edid.c | 2 +-
6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index ff1e47a9c83e..855beafb76ff 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1817,7 +1817,7 @@ static int edid_block_tag(const void *_block)

static bool edid_block_is_zero(const void *edid)
{
- return !memchr_inv(edid, 0, EDID_LENGTH);
+ return mem_is_zero(edid, EDID_LENGTH);
}

static bool drm_edid_eq(const struct drm_edid *drm_edid,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 977f149551f6..6a0c7ae654f4 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5184,7 +5184,7 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
ack[3] |= DP_TUNNELING_IRQ;
}

- if (!memchr_inv(ack, 0, sizeof(ack)))
+ if (mem_is_zero(ack, sizeof(ack)))
break;

if (!intel_dp_ack_sink_irq_esi(intel_dp, ack))
diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
index dfa1d9f30d33..ff11836459de 100644
--- a/drivers/gpu/drm/i915/display/intel_opregion.c
+++ b/drivers/gpu/drm/i915/display/intel_opregion.c
@@ -1117,7 +1117,7 @@ const struct drm_edid *intel_opregion_get_edid(struct intel_connector *connector

/* Validity corresponds to number of 128-byte blocks */
len = (opregion->asle_ext->phed & ASLE_PHED_EDID_VALID_MASK) * 128;
- if (!len || !memchr_inv(edid, 0, len))
+ if (!len || mem_is_zero(edid, len))
return NULL;

drm_edid = drm_edid_alloc(edid, len);
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
index 3527b8f446fe..2fda549dd82d 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
@@ -506,7 +506,7 @@ static int igt_dmabuf_export_vmap(void *arg)
goto out;
}

- if (memchr_inv(ptr, 0, dmabuf->size)) {
+ if (!mem_is_zero(ptr, dmabuf->size)) {
pr_err("Exported object not initialised to zero!\n");
err = -EINVAL;
goto out;
diff --git a/drivers/gpu/drm/imagination/pvr_device.h b/drivers/gpu/drm/imagination/pvr_device.h
index ecdd5767d8ef..b574e23d484b 100644
--- a/drivers/gpu/drm/imagination/pvr_device.h
+++ b/drivers/gpu/drm/imagination/pvr_device.h
@@ -668,7 +668,7 @@ pvr_ioctl_union_padding_check(void *instance, size_t union_offset,
void *padding_start = ((u8 *)instance) + union_offset + member_size;
size_t padding_size = union_size - member_size;

- return !memchr_inv(padding_start, 0, padding_size);
+ return mem_is_zero(padding_start, padding_size);
}

/**
diff --git a/drivers/gpu/drm/udl/udl_edid.c b/drivers/gpu/drm/udl/udl_edid.c
index d67e6bf1f2ae..12f48ae17073 100644
--- a/drivers/gpu/drm/udl/udl_edid.c
+++ b/drivers/gpu/drm/udl/udl_edid.c
@@ -69,7 +69,7 @@ bool udl_probe_edid(struct udl_device *udl)
* The adapter sends all-zeros if no monitor has been
* connected. We consider anything else a connection.
*/
- return !!memchr_inv(hdr, 0, sizeof(hdr));
+ return !mem_is_zero(hdr, sizeof(hdr));
}

const struct drm_edid *udl_edid_read(struct drm_connector *connector)
--
2.39.2