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Subject: media: pci: mgb4: Refactor struct resources
Author:  Ricardo Ribalda <riba...@chromium.org>
Date:    Mon Apr 29 16:04:40 2024 +0100

The struct resource end field signifies the end address not the
relative offset from the start field i.e size == (end - start) + 1.

Amend the .end field to specify the end address not the relative size
from the offset as is currently given.

Fixes cocci check:
drivers/media/pci/mgb4/mgb4_regs.c:13:22-25: WARNING: Suspicious code. 
resource_size is maybe missing with res

Link: 
https://lore.kernel.org/linux-media/20240429-fix-cocci-v3-1-3c4865f5a...@chromium.org
Reviewed-by: Martin Tůma <martin.t...@digiteqautomotive.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonog...@linaro.org>
Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>

 drivers/media/pci/mgb4/mgb4_core.c | 4 ++--
 drivers/media/pci/mgb4/mgb4_regs.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

---

diff --git a/drivers/media/pci/mgb4/mgb4_core.c 
b/drivers/media/pci/mgb4/mgb4_core.c
index 9bcf10a77fd3..60498a5abebf 100644
--- a/drivers/media/pci/mgb4/mgb4_core.c
+++ b/drivers/media/pci/mgb4/mgb4_core.c
@@ -493,13 +493,13 @@ static int mgb4_probe(struct pci_dev *pdev, const struct 
pci_device_id *id)
        struct mgb4_dev *mgbdev;
        struct resource video = {
                .start  = 0x0,
-               .end    = 0x100,
+               .end    = 0xff,
                .flags  = IORESOURCE_MEM,
                .name   = "mgb4-video",
        };
        struct resource cmt = {
                .start  = 0x1000,
-               .end    = 0x1800,
+               .end    = 0x17ff,
                .flags  = IORESOURCE_MEM,
                .name   = "mgb4-cmt",
        };
diff --git a/drivers/media/pci/mgb4/mgb4_regs.c 
b/drivers/media/pci/mgb4/mgb4_regs.c
index 53d4e4503a74..31befd722d72 100644
--- a/drivers/media/pci/mgb4/mgb4_regs.c
+++ b/drivers/media/pci/mgb4/mgb4_regs.c
@@ -10,7 +10,7 @@
 int mgb4_regs_map(struct resource *res, struct mgb4_regs *regs)
 {
        regs->mapbase = res->start;
-       regs->mapsize = res->end - res->start;
+       regs->mapsize = resource_size(res);
 
        if (!request_mem_region(regs->mapbase, regs->mapsize, res->name))
                return -EINVAL;

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