On Wed, Jan 30, 2019 at 09:58:53AM -0600, Bjorn Helgaas wrote:

On Wed, Jan 30, 2019 at 12:33:47PM +0000, Lorenzo Pieralisi wrote:

quoted

On Wed, Jan 02, 2019 at 02:03:53PM +0800, honghui.zhang@mediatek.com wrote:

quoted

From: Honghui Zhang <redacted>

drivers/pci/pcie-mediatek.c:720:13-16: WARNING: Suspicious code. resource_size is maybe missing with mem

Generated by: scripts/coccinelle/api/resource_size.cocci

Signed-off-by: Honghui Zhang <redacted>
---
 drivers/pci/controller/pcie-mediatek.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index e307166..0168376 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c

@@ -654,7 +654,6 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
 	struct resource *mem = &pcie->mem;
 	const struct mtk_pcie_soc *soc = port->pcie->soc;
 	u32 val;
-	size_t size;
 	int err;
 
 	/* MT7622 platforms need to enable LTSSM and ASPM from PCIe subsys */

@@ -706,8 +705,7 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
 		mtk_pcie_enable_msi(port);
 
 	/* Set AHB to PCIe translation windows */
-	size = mem->end - mem->start;
-	val = lower_32_bits(mem->start) | AHB2PCIE_SIZE(fls(size));
+	val = lower_32_bits(mem->start) | AHB2PCIE_SIZE(fls(resource_size(mem)));

checkpatch warns on this line, please make sure patches pass it before
posting them.

I didn't actually run checkpatch myself, so I don't know why it
complained.

WARNING: line over 80 characters
#35: FILE: drivers/pci/controller/pcie-mediatek.c:708:
+	val = lower_32_bits(mem->start) | AHB2PCIE_SIZE(fls(resource_size(mem)));

I do run it as a sanity check.

The patch you merged moves "mem_size = resource_size(mem)" higher up,
away from the previous location and its use, which makes it a little
harder to read.

That's because it was how the original code (which as you pointed out
is likely buggy) was written.

Anyway patch dropped waiting for a v2 consistent with your review -
apologies for missing some key review points.

Lorenzo

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