[PATCH] NTB: ntb_hw_idt: replace IS_ERR_OR_NULL with regular NULL checks

[PATCH] NTB: ntb_hw_idt: replace IS_ERR_OR_NULL with regular NULL checks

[Gustavo A. R. Silva]

Both devm_kcalloc() and devm_kzalloc() return NULL on error. They
never return error pointers.

The use of IS_ERR_OR_NULL is currently applied to the wrong
context.

Fix this by replacing IS_ERR_OR_NULL with regular NULL checks.

Fixes: bf2a952d31d2 ("NTB: Add IDT 89HPESxNTx PCIe-switches support")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/ntb/hw/idt/ntb_hw_idt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c
index dbe72f1..a67ef23 100644
--- a/drivers/ntb/hw/idt/ntb_hw_idt.c
+++ b/drivers/ntb/hw/idt/ntb_hw_idt.c
@@ -1105,9 +1105,9 @@ static struct idt_mw_cfg *idt_scan_mws(struct idt_ntb_dev *ndev, int port,
 	}
 
 	/* Allocate memory for memory window descriptors */
-	ret_mws = devm_kcalloc(&ndev->ntb.pdev->dev, *mw_cnt,
-				sizeof(*ret_mws), GFP_KERNEL);
-	if (IS_ERR_OR_NULL(ret_mws))
+	ret_mws = devm_kcalloc(&ndev->ntb.pdev->dev, *mw_cnt, sizeof(*ret_mws),
+			       GFP_KERNEL);
+	if (!ret_mws)
 		return ERR_PTR(-ENOMEM);
 
 	/* Copy the info of detected memory windows */
@@ -2390,7 +2390,7 @@ static struct idt_ntb_dev *idt_create_dev(struct pci_dev *pdev,
 
 	/* Allocate memory for the IDT PCIe-device descriptor */
 	ndev = devm_kzalloc(&pdev->dev, sizeof(*ndev), GFP_KERNEL);
-	if (IS_ERR_OR_NULL(ndev)) {
+	if (!ndev) {
 		dev_err(&pdev->dev, "Memory allocation failed for descriptor");
 		return ERR_PTR(-ENOMEM);
 	}
-- 
2.7.4

Re: [PATCH] NTB: ntb_hw_idt: replace IS_ERR_OR_NULL with regular NULL checks

[Jon Mason]

On Mon, Aug 27, 2018 at 05:13:06PM -0500, Gustavo A. R. Silva wrote:
> Both devm_kcalloc() and devm_kzalloc() return NULL on error. They
> never return error pointers.
> 
> The use of IS_ERR_OR_NULL is currently applied to the wrong
> context.
> 
> Fix this by replacing IS_ERR_OR_NULL with regular NULL checks.
> 
> Fixes: bf2a952d31d2 ("NTB: Add IDT 89HPESxNTx PCIe-switches support")
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

Applied to my ntb branch

Thanks,
Jon

> ---
>  drivers/ntb/hw/idt/ntb_hw_idt.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c
> index dbe72f1..a67ef23 100644
> --- a/drivers/ntb/hw/idt/ntb_hw_idt.c
> +++ b/drivers/ntb/hw/idt/ntb_hw_idt.c
> @@ -1105,9 +1105,9 @@ static struct idt_mw_cfg *idt_scan_mws(struct idt_ntb_dev *ndev, int port,
>  	}
>  
>  	/* Allocate memory for memory window descriptors */
> -	ret_mws = devm_kcalloc(&ndev->ntb.pdev->dev, *mw_cnt,
> -				sizeof(*ret_mws), GFP_KERNEL);
> -	if (IS_ERR_OR_NULL(ret_mws))
> +	ret_mws = devm_kcalloc(&ndev->ntb.pdev->dev, *mw_cnt, sizeof(*ret_mws),
> +			       GFP_KERNEL);
> +	if (!ret_mws)
>  		return ERR_PTR(-ENOMEM);
>  
>  	/* Copy the info of detected memory windows */
> @@ -2390,7 +2390,7 @@ static struct idt_ntb_dev *idt_create_dev(struct pci_dev *pdev,
>  
>  	/* Allocate memory for the IDT PCIe-device descriptor */
>  	ndev = devm_kzalloc(&pdev->dev, sizeof(*ndev), GFP_KERNEL);
> -	if (IS_ERR_OR_NULL(ndev)) {
> +	if (!ndev) {
>  		dev_err(&pdev->dev, "Memory allocation failed for descriptor");
>  		return ERR_PTR(-ENOMEM);
>  	}
> -- 
> 2.7.4
>