* [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables
@ 2016-01-26 15:26 Arnd Bergmann
2016-01-26 19:37 ` Tony Lindgren
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Arnd Bergmann @ 2016-01-26 15:26 UTC (permalink / raw)
To: linux-arm-kernel
When DT based probing is used but the DMA request fails, the
driver will print uninitialized stack data from the rx_req
and tx_req variables, as indicated by this warning:
drivers/mmc/host/omap_hsmmc.c: In function 'omap_hsmmc_probe':
drivers/mmc/host/omap_hsmmc.c:2162:3: warning: 'rx_req' may be used uninitialized in this function [-Wmaybe-uninitialized]
dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
This removes the DMA request line number from the warning, which
is the easiest solution and won't hurt us any more as we are
planning to remove the legacy code path anyway.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
A simpler patch as v1 with the same result, as suggested by Peter Ujfalusi.
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index b6639ea0bf18..87f0d840a166 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -2159,7 +2159,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
&rx_req, &pdev->dev, "rx");
if (!host->rx_chan) {
- dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
+ dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
ret = -ENXIO;
goto err_irq;
}
@@ -2169,7 +2169,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
&tx_req, &pdev->dev, "tx");
if (!host->tx_chan) {
- dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
+ dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
ret = -ENXIO;
goto err_irq;
}
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables
2016-01-26 15:26 [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables Arnd Bergmann
@ 2016-01-26 19:37 ` Tony Lindgren
2016-01-27 8:14 ` Peter Ujfalusi
2016-01-29 11:40 ` Ulf Hansson
2 siblings, 0 replies; 4+ messages in thread
From: Tony Lindgren @ 2016-01-26 19:37 UTC (permalink / raw)
To: linux-arm-kernel
* Arnd Bergmann <arnd@arndb.de> [160126 07:28]:
> When DT based probing is used but the DMA request fails, the
> driver will print uninitialized stack data from the rx_req
> and tx_req variables, as indicated by this warning:
>
> drivers/mmc/host/omap_hsmmc.c: In function 'omap_hsmmc_probe':
> drivers/mmc/host/omap_hsmmc.c:2162:3: warning: 'rx_req' may be used uninitialized in this function [-Wmaybe-uninitialized]
> dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
>
> This removes the DMA request line number from the warning, which
> is the easiest solution and won't hurt us any more as we are
> planning to remove the legacy code path anyway.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> A simpler patch as v1 with the same result, as suggested by Peter Ujfalusi.
Looks OK to me:
Acked-by: Tony Lindgren <tony@atomide.com>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index b6639ea0bf18..87f0d840a166 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -2159,7 +2159,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> &rx_req, &pdev->dev, "rx");
>
> if (!host->rx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
> + dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> ret = -ENXIO;
> goto err_irq;
> }
> @@ -2169,7 +2169,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> &tx_req, &pdev->dev, "tx");
>
> if (!host->tx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
> + dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> ret = -ENXIO;
> goto err_irq;
> }
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables
2016-01-26 15:26 [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables Arnd Bergmann
2016-01-26 19:37 ` Tony Lindgren
@ 2016-01-27 8:14 ` Peter Ujfalusi
2016-01-29 11:40 ` Ulf Hansson
2 siblings, 0 replies; 4+ messages in thread
From: Peter Ujfalusi @ 2016-01-27 8:14 UTC (permalink / raw)
To: linux-arm-kernel
On 01/26/2016 05:26 PM, Arnd Bergmann wrote:
> When DT based probing is used but the DMA request fails, the
> driver will print uninitialized stack data from the rx_req
> and tx_req variables, as indicated by this warning:
>
> drivers/mmc/host/omap_hsmmc.c: In function 'omap_hsmmc_probe':
> drivers/mmc/host/omap_hsmmc.c:2162:3: warning: 'rx_req' may be used uninitialized in this function [-Wmaybe-uninitialized]
> dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
>
> This removes the DMA request line number from the warning, which
> is the easiest solution and won't hurt us any more as we are
> planning to remove the legacy code path anyway.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> A simpler patch as v1 with the same result, as suggested by Peter Ujfalusi.
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index b6639ea0bf18..87f0d840a166 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -2159,7 +2159,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> &rx_req, &pdev->dev, "rx");
>
> if (!host->rx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
> + dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> ret = -ENXIO;
> goto err_irq;
> }
> @@ -2169,7 +2169,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> &tx_req, &pdev->dev, "tx");
>
> if (!host->tx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
> + dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> ret = -ENXIO;
> goto err_irq;
> }
>
--
P?ter
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables
2016-01-26 15:26 [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables Arnd Bergmann
2016-01-26 19:37 ` Tony Lindgren
2016-01-27 8:14 ` Peter Ujfalusi
@ 2016-01-29 11:40 ` Ulf Hansson
2 siblings, 0 replies; 4+ messages in thread
From: Ulf Hansson @ 2016-01-29 11:40 UTC (permalink / raw)
To: linux-arm-kernel
On 26 January 2016 at 16:26, Arnd Bergmann <arnd@arndb.de> wrote:
> When DT based probing is used but the DMA request fails, the
> driver will print uninitialized stack data from the rx_req
> and tx_req variables, as indicated by this warning:
>
> drivers/mmc/host/omap_hsmmc.c: In function 'omap_hsmmc_probe':
> drivers/mmc/host/omap_hsmmc.c:2162:3: warning: 'rx_req' may be used uninitialized in this function [-Wmaybe-uninitialized]
> dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
>
> This removes the DMA request line number from the warning, which
> is the easiest solution and won't hurt us any more as we are
> planning to remove the legacy code path anyway.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Thanks, applied for next!
Kind regards
Uffe
> ---
> A simpler patch as v1 with the same result, as suggested by Peter Ujfalusi.
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index b6639ea0bf18..87f0d840a166 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -2159,7 +2159,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> &rx_req, &pdev->dev, "rx");
>
> if (!host->rx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
> + dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel\n");
> ret = -ENXIO;
> goto err_irq;
> }
> @@ -2169,7 +2169,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> &tx_req, &pdev->dev, "tx");
>
> if (!host->tx_chan) {
> - dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
> + dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel\n");
> ret = -ENXIO;
> goto err_irq;
> }
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-01-29 11:40 UTC | newest]
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2016-01-26 15:26 [PATCH v2] mmc: omap_hsmmc: don't print uninitialized variables Arnd Bergmann
2016-01-26 19:37 ` Tony Lindgren
2016-01-27 8:14 ` Peter Ujfalusi
2016-01-29 11:40 ` Ulf Hansson
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