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Message-ID: <CAC_iWj+5MskeWaqa242zFsGRrgAxMGuVPHL6kYm1DUtH_jkDTg@mail.gmail.com> Date: Sat, 18 Nov 2023 09:21:23 +0200 From: Ilias Apalodimas <ilias.apalodimas@...aro.org> To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> Cc: Siddharth Vadapalli <s-vadapalli@...com>, Ravi Gunasekaran <r-gunasekaran@...com>, Roger Quadros <rogerq@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Marek Majtyka <alardam@...il.com>, Gerhard Engleder <gerhard@...leder-embedded.com>, Rob Herring <robh@...nel.org>, Yunsheng Lin <linyunsheng@...wei.com>, linux-omap@...r.kernel.org, netdev@...r.kernel.org, kernel@...gutronix.de Subject: Re: [PATCH 3/7] net: ethernet: ti: cpsw-new: Don't error out in .remove() On Fri, 17 Nov 2023 at 11:17, Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote: > > Returning early from .remove() with an error code still results in the > driver unbinding the device. So the driver core ignores the returned error > code and the resources that were not freed are never catched up. In > combination with devm this also often results in use-after-free bugs. > > If runtime resume fails, it's still important to free all resources, so > don't return with an error code, but emit an error message and continue > freeing acquired stuff. > > This prepares changing cpsw_remove() to return void. > > Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac") > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> > --- > drivers/net/ethernet/ti/cpsw_new.c | 16 ++++++++++++---- > 1 file changed, 12 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c > index 0e4f526b1753..a6ce409f563c 100644 > --- a/drivers/net/ethernet/ti/cpsw_new.c > +++ b/drivers/net/ethernet/ti/cpsw_new.c > @@ -2042,16 +2042,24 @@ static int cpsw_remove(struct platform_device *pdev) > struct cpsw_common *cpsw = platform_get_drvdata(pdev); > int ret; > > - ret = pm_runtime_resume_and_get(&pdev->dev); > + ret = pm_runtime_get_sync(&pdev->dev); > if (ret < 0) > - return ret; > + /* There is no need to do something about that. The important > + * thing is to not exit early, but do all cleanup that doesn't > + * requrie register access. > + */ > + dev_err(&pdev->dev, "runtime resume failed (%pe)\n", > + ERR_PTR(ret)); > > cpsw_unregister_notifiers(cpsw); > cpsw_unregister_devlink(cpsw); > cpsw_unregister_ports(cpsw); > > - cpts_release(cpsw->cpts); > - cpdma_ctlr_destroy(cpsw->dma); > + if (ret >= 0) { > + cpts_release(cpsw->cpts); > + cpdma_ctlr_destroy(cpsw->dma); > + } > + > cpsw_remove_dt(cpsw); > pm_runtime_put_sync(&pdev->dev); > pm_runtime_disable(&pdev->dev); > -- > 2.42.0 > Acked-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
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