diff mbox series

[next,v2,1/2] mmc: sunplus: Fix error handling in spmmc_drv_probe()

Message ID 20230809071812.547229-1-harshit.m.mogalapalli@oracle.com
State New
Headers
Series [next,v2,1/2] mmc: sunplus: Fix error handling in spmmc_drv_probe() |

Commit Message

Harshit Mogalapalli Aug. 9, 2023, 7:18 a.m. UTC 
  When mmc allocation succeeds, the error paths are not freeing mmc.

Fix the above issue by changing mmc_alloc_host() to devm_mmc_alloc_host()
to simplify the error handling. Remove label 'probe_free_host' as devm_*
api takes care of freeing, also remove mmc_free_host() from remove
function as devm_* takes care of freeing.

Fixes: 4e268fed8b18 ("mmc: Add mmc driver for Sunplus SP7021")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/a3829ed3-d827-4b9d-827e-9cc24a3ec3bc@moroto.mountain/
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
---
This is based on static analysis with smatch, only compile tested.

v1->v2: Simplify code by using devm_mmc_alloc_host() instead of
mmc_alloc_host() (Ulf Hansson's suggestion)
---
 drivers/mmc/host/sunplus-mmc.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

Comments

Ulf Hansson Aug. 9, 2023, 11:08 a.m. UTC | #1 
On Wed, 9 Aug 2023 at 09:18, Harshit Mogalapalli
<harshit.m.mogalapalli@oracle.com> wrote:
>
> When mmc allocation succeeds, the error paths are not freeing mmc.
>
> Fix the above issue by changing mmc_alloc_host() to devm_mmc_alloc_host()
> to simplify the error handling. Remove label 'probe_free_host' as devm_*
> api takes care of freeing, also remove mmc_free_host() from remove
> function as devm_* takes care of freeing.
>
> Fixes: 4e268fed8b18 ("mmc: Add mmc driver for Sunplus SP7021")
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/all/a3829ed3-d827-4b9d-827e-9cc24a3ec3bc@moroto.mountain/
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>

This doesn't apply on my next branch, please rebase it.

Moreover, it looks like you should replace a few more "goto
probe_free_host;" with "return ret;". Please have a closer look.

Kind regards
Uffe

> ---
> This is based on static analysis with smatch, only compile tested.
>
> v1->v2: Simplify code by using devm_mmc_alloc_host() instead of
> mmc_alloc_host() (Ulf Hansson's suggestion)
> ---
>  drivers/mmc/host/sunplus-mmc.c | 14 +++-----------
>  1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/host/sunplus-mmc.c b/drivers/mmc/host/sunplus-mmc.c
> index a55a87f64d2a..2bdebeb1f8e4 100644
> --- a/drivers/mmc/host/sunplus-mmc.c
> +++ b/drivers/mmc/host/sunplus-mmc.c
> @@ -863,11 +863,9 @@ static int spmmc_drv_probe(struct platform_device *pdev)
>         struct spmmc_host *host;
>         int ret = 0;
>
> -       mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
> -       if (!mmc) {
> -               ret = -ENOMEM;
> -               goto probe_free_host;
> -       }
> +       mmc = devm_mmc_alloc_host(&pdev->dev, sizeof(struct spmmc_host));
> +       if (!mmc)
> +               return -ENOMEM;
>
>         host = mmc_priv(mmc);
>         host->mmc = mmc;
> @@ -938,11 +936,6 @@ static int spmmc_drv_probe(struct platform_device *pdev)
>
>  clk_disable:
>         clk_disable_unprepare(host->clk);
> -
> -probe_free_host:
> -       if (mmc)
> -               mmc_free_host(mmc);
> -
>         return ret;
>  }
>
> @@ -956,7 +949,6 @@ static int spmmc_drv_remove(struct platform_device *dev)
>         pm_runtime_put_noidle(&dev->dev);
>         pm_runtime_disable(&dev->dev);
>         platform_set_drvdata(dev, NULL);
> -       mmc_free_host(host->mmc);
>
>         return 0;
>  }
> --
> 2.39.3
>
Ulf Hansson Aug. 9, 2023, 11:17 a.m. UTC | #2 
On Wed, 9 Aug 2023 at 13:08, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> On Wed, 9 Aug 2023 at 09:18, Harshit Mogalapalli
> <harshit.m.mogalapalli@oracle.com> wrote:
> >
> > When mmc allocation succeeds, the error paths are not freeing mmc.
> >
> > Fix the above issue by changing mmc_alloc_host() to devm_mmc_alloc_host()
> > to simplify the error handling. Remove label 'probe_free_host' as devm_*
> > api takes care of freeing, also remove mmc_free_host() from remove
> > function as devm_* takes care of freeing.
> >
> > Fixes: 4e268fed8b18 ("mmc: Add mmc driver for Sunplus SP7021")
> > Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> > Closes: https://lore.kernel.org/all/a3829ed3-d827-4b9d-827e-9cc24a3ec3bc@moroto.mountain/
> > Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
>
> This doesn't apply on my next branch, please rebase it.
>
> Moreover, it looks like you should replace a few more "goto
> probe_free_host;" with "return ret;". Please have a closer look.

Oh, my bad, please ignore the above!

I had another fix for the sunplus driver queued on my next branch. I
have moved that patch to fixes and applied your patch on top, thanks!

Kind regards
Uffe

> > ---
> > This is based on static analysis with smatch, only compile tested.
> >
> > v1->v2: Simplify code by using devm_mmc_alloc_host() instead of
> > mmc_alloc_host() (Ulf Hansson's suggestion)
> > ---
> >  drivers/mmc/host/sunplus-mmc.c | 14 +++-----------
> >  1 file changed, 3 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sunplus-mmc.c b/drivers/mmc/host/sunplus-mmc.c
> > index a55a87f64d2a..2bdebeb1f8e4 100644
> > --- a/drivers/mmc/host/sunplus-mmc.c
> > +++ b/drivers/mmc/host/sunplus-mmc.c
> > @@ -863,11 +863,9 @@ static int spmmc_drv_probe(struct platform_device *pdev)
> >         struct spmmc_host *host;
> >         int ret = 0;
> >
> > -       mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
> > -       if (!mmc) {
> > -               ret = -ENOMEM;
> > -               goto probe_free_host;
> > -       }
> > +       mmc = devm_mmc_alloc_host(&pdev->dev, sizeof(struct spmmc_host));
> > +       if (!mmc)
> > +               return -ENOMEM;
> >
> >         host = mmc_priv(mmc);
> >         host->mmc = mmc;
> > @@ -938,11 +936,6 @@ static int spmmc_drv_probe(struct platform_device *pdev)
> >
> >  clk_disable:
> >         clk_disable_unprepare(host->clk);
> > -
> > -probe_free_host:
> > -       if (mmc)
> > -               mmc_free_host(mmc);
> > -
> >         return ret;
> >  }
> >
> > @@ -956,7 +949,6 @@ static int spmmc_drv_remove(struct platform_device *dev)
> >         pm_runtime_put_noidle(&dev->dev);
> >         pm_runtime_disable(&dev->dev);
> >         platform_set_drvdata(dev, NULL);
> > -       mmc_free_host(host->mmc);
> >
> >         return 0;
> >  }
> > --
> > 2.39.3
> >
diff mbox series

Patch

diff --git a/drivers/mmc/host/sunplus-mmc.c b/drivers/mmc/host/sunplus-mmc.c
index a55a87f64d2a..2bdebeb1f8e4 100644
--- a/drivers/mmc/host/sunplus-mmc.c
+++ b/drivers/mmc/host/sunplus-mmc.c
@@ -863,11 +863,9 @@  static int spmmc_drv_probe(struct platform_device *pdev)
 	struct spmmc_host *host;
 	int ret = 0;
 
-	mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
-	if (!mmc) {
-		ret = -ENOMEM;
-		goto probe_free_host;
-	}
+	mmc = devm_mmc_alloc_host(&pdev->dev, sizeof(struct spmmc_host));
+	if (!mmc)
+		return -ENOMEM;
 
 	host = mmc_priv(mmc);
 	host->mmc = mmc;
@@ -938,11 +936,6 @@  static int spmmc_drv_probe(struct platform_device *pdev)
 
 clk_disable:
 	clk_disable_unprepare(host->clk);
-
-probe_free_host:
-	if (mmc)
-		mmc_free_host(mmc);
-
 	return ret;
 }
 
@@ -956,7 +949,6 @@  static int spmmc_drv_remove(struct platform_device *dev)
 	pm_runtime_put_noidle(&dev->dev);
 	pm_runtime_disable(&dev->dev);
 	platform_set_drvdata(dev, NULL);
-	mmc_free_host(host->mmc);
 
 	return 0;
 }