linux-kernel - Re: [PATCH v4 05/18] PCI: dwc: Deallocate EPC memory on EP init error

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Date:   Mon, 13 Jun 2022 14:09:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Joao Pinto <jpinto@...opsys.com>,
        Niklas Cassel <niklas.cassel@...s.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/18] PCI: dwc: Deallocate EPC memory on EP init error

On Fri, Jun 10, 2022 at 11:25:21AM +0300, Serge Semin wrote:
> If the dw_pcie_ep_init() method fails to perform any action after the EPC
> memory is initialized and the MSI memory region is allocated, the later
> parts won't be undone thus causing the memory leak.  Let's fix that by
> introducing the cleanup-on-error path in the dw_pcie_ep_init() method,
> which will be taken should any consequent erroneous situation happens.
> 
> Fixes: 2fd0c9d966cc ("PCI: designware-ep: Pre-allocate memory for MSI in dw_pcie_ep_init")
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> ---
> 
> Changelog v2:
> - This is a new patch create as a result of the discussion in:
>   Link: https://lore.kernel.org/linux-pci/20220324014836.19149-26-Sergey.Semin@baikalelectronics.ru
> ---
>  .../pci/controller/dwc/pcie-designware-ep.c    | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>