[PATCH 1/2] PCI: endpoint: Print the EPF name in the error log of pci_epf_make()

[PATCH 1/2] PCI: endpoint: Print the EPF name in the error log of pci_epf_make()

[Manivannan Sadhasivam]

From: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>

Merely printing the error log without the actual EPF name will not give
much clue to the users about the failure. Hence, print the EPF name also.

Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
---
 drivers/pci/endpoint/pci-ep-cfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index 076d115db02b..a19db22b7991 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -625,7 +625,8 @@ static struct config_group *pci_epf_make(struct config_group *group,
 	epf = pci_epf_create(epf_name);
 	if (IS_ERR(epf)) {
 		err = PTR_ERR(epf);
-		pr_err("failed to create endpoint function device: %d\n", err);
+		pr_err("failed to create endpoint function device (%s): %d\n",
+			epf_name, err);
 		goto free_name;
 	}
 
-- 
2.51.0

[PATCH 2/2] PCI: endpoint: Improve error messages

[Manivannan Sadhasivam]

From: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>

Include errno in the error prints and also use dev_err() where applicable.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
---
 drivers/pci/endpoint/pci-ep-cfs.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index a19db22b7991..2d2efd444b02 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -565,7 +565,8 @@ static void pci_ep_cfs_add_type_group(struct pci_epf_group *epf_group)
 
 	if (IS_ERR(group)) {
 		dev_err(&epf_group->epf->dev,
-			"failed to create epf type specific attributes\n");
+			"failed to create epf type specific attributes: %d\n",
+			(int)PTR_ERR(group));
 		return;
 	}
 
@@ -578,13 +579,17 @@ static void pci_epf_cfs_add_sub_groups(struct pci_epf_group *epf_group)
 
 	group = pci_ep_cfs_add_primary_group(epf_group);
 	if (IS_ERR(group)) {
-		pr_err("failed to create 'primary' EPC interface\n");
+		dev_err(&epf_group->epf->dev,
+			"failed to create 'primary' EPC interface: %d\n",
+			(int)PTR_ERR(group));
 		return;
 	}
 
 	group = pci_ep_cfs_add_secondary_group(epf_group);
 	if (IS_ERR(group)) {
-		pr_err("failed to create 'secondary' EPC interface\n");
+		dev_err(&epf_group->epf->dev,
+			"failed to create 'secondary' EPC interface: %d\n",
+			(int)PTR_ERR(group));
 		return;
 	}
 
@@ -675,8 +680,8 @@ struct config_group *pci_ep_cfs_add_epf_group(const char *name)
 	group = configfs_register_default_group(functions_group, name,
 						&pci_epf_group_type);
 	if (IS_ERR(group))
-		pr_err("failed to register configfs group for %s function\n",
-		       name);
+		pr_err("failed to register configfs group for %s function: %d\n",
+		       name, (int)PTR_ERR(group));
 
 	return group;
 }
-- 
2.51.0

Re: [PATCH 2/2] PCI: endpoint: Improve error messages

[ALOK TIWARI]

On 3/5/2026 12:42 PM, Manivannan Sadhasivam wrote:
> From: Manivannan Sadhasivam<manivannan.sadhasivam@oss.qualcomm.com>
> 
> Include errno in the error prints and also use dev_err() where applicable.
> 
> Signed-off-by: Manivannan Sadhasivam<manivannan.sadhasivam@oss.qualcomm.com>
> ---
>   drivers/pci/endpoint/pci-ep-cfs.c | 15 ++++++++++-----
>   1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
> index a19db22b7991..2d2efd444b02 100644
> --- a/drivers/pci/endpoint/pci-ep-cfs.c
> +++ b/drivers/pci/endpoint/pci-ep-cfs.c
> @@ -565,7 +565,8 @@ static void pci_ep_cfs_add_type_group(struct pci_epf_group *epf_group)
>   
>   	if (IS_ERR(group)) {
>   		dev_err(&epf_group->epf->dev,
> -			"failed to create epf type specific attributes\n");
> +			"failed to create epf type specific attributes: %d\n",
> +			(int)PTR_ERR(group));
>   		return;
>   	}
>   
> @@ -578,13 +579,17 @@ static void pci_epf_cfs_add_sub_groups(struct pci_epf_group *epf_group)
>   
>   	group = pci_ep_cfs_add_primary_group(epf_group);
>   	if (IS_ERR(group)) {
> -		pr_err("failed to create 'primary' EPC interface\n");
> +		dev_err(&epf_group->epf->dev,
> +			"failed to create 'primary' EPC interface: %d\n",
> +			(int)PTR_ERR(group));

using (int) not wrong but it is a bit unusual, in this case can we use 
"%pe" instead ?
"failed to create 'primary' EPC interface: %pe\n", group)

>   		return;
>   	}


Thanks,
Alok

Re: [PATCH 2/2] PCI: endpoint: Improve error messages

[Manivannan Sadhasivam]

On Fri, Mar 06, 2026 at 05:25:49PM +0530, ALOK TIWARI wrote:
> 
> 
> On 3/5/2026 12:42 PM, Manivannan Sadhasivam wrote:
> > From: Manivannan Sadhasivam<manivannan.sadhasivam@oss.qualcomm.com>
> > 
> > Include errno in the error prints and also use dev_err() where applicable.
> > 
> > Signed-off-by: Manivannan Sadhasivam<manivannan.sadhasivam@oss.qualcomm.com>
> > ---
> >   drivers/pci/endpoint/pci-ep-cfs.c | 15 ++++++++++-----
> >   1 file changed, 10 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
> > index a19db22b7991..2d2efd444b02 100644
> > --- a/drivers/pci/endpoint/pci-ep-cfs.c
> > +++ b/drivers/pci/endpoint/pci-ep-cfs.c
> > @@ -565,7 +565,8 @@ static void pci_ep_cfs_add_type_group(struct pci_epf_group *epf_group)
> >   	if (IS_ERR(group)) {
> >   		dev_err(&epf_group->epf->dev,
> > -			"failed to create epf type specific attributes\n");
> > +			"failed to create epf type specific attributes: %d\n",
> > +			(int)PTR_ERR(group));
> >   		return;
> >   	}
> > @@ -578,13 +579,17 @@ static void pci_epf_cfs_add_sub_groups(struct pci_epf_group *epf_group)
> >   	group = pci_ep_cfs_add_primary_group(epf_group);
> >   	if (IS_ERR(group)) {
> > -		pr_err("failed to create 'primary' EPC interface\n");
> > +		dev_err(&epf_group->epf->dev,
> > +			"failed to create 'primary' EPC interface: %d\n",
> > +			(int)PTR_ERR(group));
> 
> using (int) not wrong but it is a bit unusual, in this case can we use "%pe"
> instead ?
> "failed to create 'primary' EPC interface: %pe\n", group)
> 

Agree. Amended this change while applying, thanks!

- Mani

-- 
மணிவண்ணன் சதாசிவம்

Re: [PATCH 1/2] PCI: endpoint: Print the EPF name in the error log of pci_epf_make()

[Manivannan Sadhasivam]

On Thu, 05 Mar 2026 12:42:34 +0530, Manivannan Sadhasivam wrote:
> Merely printing the error log without the actual EPF name will not give
> much clue to the users about the failure. Hence, print the EPF name also.

Applied, thanks!

[1/2] PCI: endpoint: Print the EPF name in the error log of pci_epf_make()
      commit: ff5387d4f0798cf1d1a4f548427bd9142cf35b66
[2/2] PCI: endpoint: Improve error messages
      commit: 396d44dcaf8d367ed15ecec30e2f69c62f93306c

Best regards,
-- 
Manivannan Sadhasivam <mani@kernel.org>