From: Marc Zyngier <maz@misterjones.org>
To: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Rob Herring <robh@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Jingoo Han <jingoohan1@gmail.com>, Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Richard Zhu <hongxing.zhu@nxp.com>,
Lucas Stach <l.stach@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
NXP Linux Team <linux-imx@nxp.com>,
Yue Wang <yue.wang@amlogic.com>,
Kevin Hilman <khilman@baylibre.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Jerome Brunet <jbrunet@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Jesper Nilsson <jesper.nilsson@axis.com>,
Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
Xiaowei Song <songxiaowei@hisilicon.com>,
Binghui Wang <wangbinghui@hisilicon.com>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Stanimir Varbanov <svarbanov@mm-sol.com>,
Pratyush Anand <pratyush.anand@gmail.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Kunihiko Hayashi <hayashi.kunihiko@socionext.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
linux-samsung-soc@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-arm-kernel@axis.com,
linux-arm-msm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-amlogic@lists.infradead.org, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 2/5] PCI: dwc: Check alloc_page() return value
Date: Tue, 29 Sep 2020 18:29:52 +0100 [thread overview]
Message-ID: <74af578c79bd09f2111e5438917f2c6e@misterjones.org> (raw)
In-Reply-To: <20200924190623.3251c2ac@xhacker.debian>
On 2020-09-24 12:06, Jisheng Zhang wrote:
> We need to check alloc_page() succeed or not before continuing.
>
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
> b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 0a19de946351..9e04e8ef3aa4 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -303,6 +303,11 @@ void dw_pcie_msi_init(struct pcie_port *pp)
> u64 msi_target;
>
> pp->msi_page = alloc_page(GFP_KERNEL);
> + if (!pp->msi_page) {
> + dev_err(dev, "Failed to alloc MSI page\n");
A failing allocation will already scream, so there is no need to
add insult to injury.
More importantly, what is this MSI page ever used for? If I remember
well, this is just a random address that never gets written to.
So why do we allocate a page here? Why do we bother with this DMA
mapping?
M.
--
Who you jivin' with that Cosmik Debris?
next prev parent reply other threads:[~2020-09-29 17:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 11:05 [PATCH v2 0/5] PCI: dwc: improve msi handling Jisheng Zhang
2020-09-24 11:05 ` [PATCH v2 1/5] PCI: dwc: Call dma_unmap_page() before freeing the msi page Jisheng Zhang
2020-09-24 11:48 ` Gustavo Pimentel
2020-09-24 11:06 ` [PATCH v2 2/5] PCI: dwc: Check alloc_page() return value Jisheng Zhang
2020-09-24 11:47 ` Gustavo Pimentel
2020-09-29 17:29 ` Marc Zyngier [this message]
2020-09-30 1:23 ` Jisheng Zhang
2020-09-24 11:06 ` [PATCH v2 3/5] PCI: dwc: Rename dw_pcie_free_msi to dw_pcie_msi_deinit Jisheng Zhang
2020-09-24 11:49 ` Gustavo Pimentel
2020-09-24 11:07 ` [PATCH v2 4/5] PCI: dwc: Skip PCIE_MSI_INTR0* programming if MSI is disabled Jisheng Zhang
2020-09-24 11:49 ` Gustavo Pimentel
2020-09-24 11:07 ` [PATCH v2 5/5] PCI: dwc: Move dw_pcie_msi_init() from each users to designware host Jisheng Zhang
2020-10-08 5:43 ` Vidya Sagar
2021-03-07 22:10 ` Krzysztof Wilczyński
2021-03-11 6:50 ` Jisheng Zhang
2020-09-25 8:53 ` [PATCH v2 0/5] PCI: dwc: improve msi handling Jon Hunter
2020-09-25 9:17 ` Jisheng Zhang
2020-09-25 9:27 ` Jisheng Zhang
2020-09-25 15:13 ` Jon Hunter
2020-09-27 8:28 ` Jisheng Zhang
2020-09-28 17:46 ` Jon Hunter
2020-09-29 10:48 ` Jisheng Zhang
2020-09-29 13:22 ` Jon Hunter
2020-09-29 17:25 ` Marc Zyngier
2020-09-29 18:02 ` Jon Hunter
2020-09-29 18:12 ` Marc Zyngier
2020-10-06 6:26 ` Vidya Sagar
2020-10-06 6:36 ` Jisheng Zhang
2020-10-08 5:32 ` Vidya Sagar
2020-10-09 8:37 ` [PATCH] PCI: dwc: Move dw_pcie_msi_init() from each users to designware host Jisheng Zhang
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