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[v2,01/26] media: pci: mgb4: Refactor struct resources

Message ID 20240419-fix-cocci-v2-1-2119e692309c@chromium.org
State Accepted
Commit ff924ca08e85bc89dc0ab85c697c09298a9c74a6
Headers show
Series [v2,01/26] media: pci: mgb4: Refactor struct resources | expand

Commit Message

Ricardo Ribalda April 19, 2024, 9:47 a.m. UTC 
The struct resource end field is inclusive not exclusive, this is, the
size is (end - start) +1.

Update the definitions and use the generic resource_size() function.

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

Reviewed-by: Martin Tůma <martin.tuma@digiteqautomotive.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/pci/mgb4/mgb4_core.c | 4 ++--
 drivers/media/pci/mgb4/mgb4_regs.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

Comments

Bryan O'Donoghue April 20, 2024, 11 p.m. UTC | #1 
On 19/04/2024 10:47, Ricardo Ribalda wrote:
> The struct resource end field is inclusive not exclusive, this is, the
> size is (end - start) +1.

", this is," doesn't parse on my end

"i.e" => that is, would be more appropriate I think.

"The struct resource end field is inclusive not exclusive of the size" 
which I still think is a confusing statement.

Perhaps something much easier to understand is called for

"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."

Other than that, I think its reasonable to assume the mapping != 0 - 
0x100 inclusive.

Please consider updating your commit log and if you do add my

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

---
bod
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Patch

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;