linux-kernel - [PATCH] [next] i915/gvt: remove hardcoded value on crc32

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Date:   Sun, 30 Oct 2022 16:36:28 +1300
From:   Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        paulo.miguel.almeida.rodenas@...il.com
Subject: [PATCH] [next] i915/gvt: remove hardcoded value on crc32_start
 calculation

struct gvt_firmware_header has a crc32 member in which all members that
come after the that field are used to calculate it. The previous
implementation added the value '4' (crc32's u32 size) to calculate the
crc32_start offset which came across as a bit cryptic until you take a
deeper look at the struct.

This patch changes crc32_start offset to the 'version' member which is
the first member of the struct gvt_firmware_header after crc32.

It's worth mentioning that doing a build before/after this patch results
in no binary output differences.

Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
---
 drivers/gpu/drm/i915/gvt/firmware.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/firmware.c b/drivers/gpu/drm/i915/gvt/firmware.c
index 54fe442238c6..a683c22d5b64 100644
--- a/drivers/gpu/drm/i915/gvt/firmware.c
+++ b/drivers/gpu/drm/i915/gvt/firmware.c
@@ -104,7 +104,7 @@ static int expose_firmware_sysfs(struct intel_gvt *gvt)
 
 	memcpy(p, gvt->firmware.mmio, info->mmio_size);
 
-	crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
+	crc32_start = offsetof(struct gvt_firmware_header, version);
 	h->crc32 = crc32_le(0, firmware + crc32_start, size - crc32_start);
 
 	firmware_attr.size = size;
-- 
2.25.4