Re: [PATCH] mmc: owl-mmc: Fix dma_chan refcnt leak in owl_mmc_probe()

[Markus Elfring <Markus.Elfring@web.de>]

> Fix this issue by jumping to "err_put_dma" label when those error
> scenarios occur.

I suggest to reconsider your jump target selection.


…
> +++ b/drivers/mmc/host/owl-mmc.c
…
> @@ -643,19 +643,22 @@ static int owl_mmc_probe(struct platform_device *pdev)
>  	return 0;
>
> +err_put_dma:
> +	if (owl_host->dma)
> +		dma_release_channel(owl_host->dma);

I interpret the source code in the way that you would like to call
this function for the desired exception handling only after a call
of the function “dma_request_chan” succeeded.
Thus I would expect that the passed pointer will usually be still valid.
(Can the proposed null pointer check be omitted then?)

How do you think about the following change possibility?

+err_release_channel:
+	dma_release_channel(owl_host->dma);


Would you like to add the tag “Fixes” to the change description?

Regards,
Markus