From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lorenzo Pieralisi Subject: Re: [PATCH] PCI: Mediatek: Use resource_size function on resource object Date: Wed, 30 Jan 2019 16:31:55 +0000 Message-ID: <20190130163155.GA5847@e107981-ln.cambridge.arm.com> References: <1546409033-20412-1-git-send-email-honghui.zhang@mediatek.com> <20190130123347.GB30991@e107981-ln.cambridge.arm.com> <20190130155853.GE229773@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20190130155853.GE229773@google.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Bjorn Helgaas Cc: youlin.pei@mediatek.com, ryder.lee@mediatek.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, jianjun.wang@mediatek.com, linux-mediatek@lists.infradead.org, honghui.zhang@mediatek.com, linux-arm-kernel@lists.infradead.org List-Id: linux-mediatek@lists.infradead.org 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: > > On Wed, Jan 02, 2019 at 02:03:53PM +0800, honghui.zhang@mediatek.com wrote: > > > From: Honghui Zhang > > > > > > 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 > > > --- > > > 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