[PATCH] ocxl: Clarify error path in setup_xsl_irq()
Implementing rollback with goto and labels is a common practice that leads to prettier and more maintainable code. FWIW, this design pattern is already being used in alloc_link() a few lines below in this file. Do the same in setup_xsl_irq(). Signed-off-by: Greg Kurz --- drivers/misc/ocxl/link.c | 23 ++- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c index eed92055184d..659977a17405 100644 --- a/drivers/misc/ocxl/link.c +++ b/drivers/misc/ocxl/link.c @@ -273,9 +273,9 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) spa->irq_name = kasprintf(GFP_KERNEL, "ocxl-xsl-%x-%x-%x", link->domain, link->bus, link->dev); if (!spa->irq_name) { - unmap_irq_registers(spa); dev_err(&dev->dev, "Can't allocate name for xsl interrupt\n"); - return -ENOMEM; + rc = -ENOMEM; + goto err_xsl; } /* * At some point, we'll need to look into allowing a higher @@ -283,11 +283,10 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) */ spa->virq = irq_create_mapping(NULL, hwirq); if (!spa->virq) { - kfree(spa->irq_name); - unmap_irq_registers(spa); dev_err(&dev->dev, "irq_create_mapping failed for translation interrupt\n"); - return -EINVAL; + rc = -EINVAL; + goto err_name; } dev_dbg(&dev->dev, "hwirq %d mapped to virq %d\n", hwirq, spa->virq); @@ -295,15 +294,21 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) rc = request_irq(spa->virq, xsl_fault_handler, 0, spa->irq_name, link); if (rc) { - irq_dispose_mapping(spa->virq); - kfree(spa->irq_name); - unmap_irq_registers(spa); dev_err(&dev->dev, "request_irq failed for translation interrupt: %d\n", rc); - return -EINVAL; + rc = -EINVAL; + goto err_mapping; } return 0; + +err_mapping: + irq_dispose_mapping(spa->virq); +err_name: + kfree(spa->irq_name); +err_xsl: + unmap_irq_registers(spa); + return rc; } static void release_xsl_irq(struct link *link)
Re: [PATCH] ocxl: Clarify error path in setup_xsl_irq()
Le 10/12/2018 à 16:18, Greg Kurz a écrit : Implementing rollback with goto and labels is a common practice that leads to prettier and more maintainable code. FWIW, this design pattern is already being used in alloc_link() a few lines below in this file. Do the same in setup_xsl_irq(). Signed-off-by: Greg Kurz --- This looks good. I don't have a fixed limit when I start using the "goto undo" pattern, so it's likely inconsistent in other places as well. Truth is I'm not too fussed either way. Acked-by: Frederic Barrat drivers/misc/ocxl/link.c | 23 ++- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c index eed92055184d..659977a17405 100644 --- a/drivers/misc/ocxl/link.c +++ b/drivers/misc/ocxl/link.c @@ -273,9 +273,9 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) spa->irq_name = kasprintf(GFP_KERNEL, "ocxl-xsl-%x-%x-%x", link->domain, link->bus, link->dev); if (!spa->irq_name) { - unmap_irq_registers(spa); dev_err(&dev->dev, "Can't allocate name for xsl interrupt\n"); - return -ENOMEM; + rc = -ENOMEM; + goto err_xsl; } /* * At some point, we'll need to look into allowing a higher @@ -283,11 +283,10 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) */ spa->virq = irq_create_mapping(NULL, hwirq); if (!spa->virq) { - kfree(spa->irq_name); - unmap_irq_registers(spa); dev_err(&dev->dev, "irq_create_mapping failed for translation interrupt\n"); - return -EINVAL; + rc = -EINVAL; + goto err_name; } dev_dbg(&dev->dev, "hwirq %d mapped to virq %d\n", hwirq, spa->virq); @@ -295,15 +294,21 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) rc = request_irq(spa->virq, xsl_fault_handler, 0, spa->irq_name, link); if (rc) { - irq_dispose_mapping(spa->virq); - kfree(spa->irq_name); - unmap_irq_registers(spa); dev_err(&dev->dev, "request_irq failed for translation interrupt: %d\n", rc); - return -EINVAL; + rc = -EINVAL; + goto err_mapping; } return 0; + +err_mapping: + irq_dispose_mapping(spa->virq); +err_name: + kfree(spa->irq_name); +err_xsl: + unmap_irq_registers(spa); + return rc; } static void release_xsl_irq(struct link *link)
Re: [PATCH] ocxl: Clarify error path in setup_xsl_irq()
On 11/12/18 2:18 am, Greg Kurz wrote: Implementing rollback with goto and labels is a common practice that leads to prettier and more maintainable code. FWIW, this design pattern is already being used in alloc_link() a few lines below in this file. Do the same in setup_xsl_irq(). Signed-off-by: Greg Kurz This is good, thanks. Acked-by: Andrew Donnellan --- drivers/misc/ocxl/link.c | 23 ++- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c index eed92055184d..659977a17405 100644 --- a/drivers/misc/ocxl/link.c +++ b/drivers/misc/ocxl/link.c @@ -273,9 +273,9 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) spa->irq_name = kasprintf(GFP_KERNEL, "ocxl-xsl-%x-%x-%x", link->domain, link->bus, link->dev); if (!spa->irq_name) { - unmap_irq_registers(spa); dev_err(&dev->dev, "Can't allocate name for xsl interrupt\n"); - return -ENOMEM; + rc = -ENOMEM; + goto err_xsl; } /* * At some point, we'll need to look into allowing a higher @@ -283,11 +283,10 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) */ spa->virq = irq_create_mapping(NULL, hwirq); if (!spa->virq) { - kfree(spa->irq_name); - unmap_irq_registers(spa); dev_err(&dev->dev, "irq_create_mapping failed for translation interrupt\n"); - return -EINVAL; + rc = -EINVAL; + goto err_name; } dev_dbg(&dev->dev, "hwirq %d mapped to virq %d\n", hwirq, spa->virq); @@ -295,15 +294,21 @@ static int setup_xsl_irq(struct pci_dev *dev, struct link *link) rc = request_irq(spa->virq, xsl_fault_handler, 0, spa->irq_name, link); if (rc) { - irq_dispose_mapping(spa->virq); - kfree(spa->irq_name); - unmap_irq_registers(spa); dev_err(&dev->dev, "request_irq failed for translation interrupt: %d\n", rc); - return -EINVAL; + rc = -EINVAL; + goto err_mapping; } return 0; + +err_mapping: + irq_dispose_mapping(spa->virq); +err_name: + kfree(spa->irq_name); +err_xsl: + unmap_irq_registers(spa); + return rc; } static void release_xsl_irq(struct link *link) -- Andrew Donnellan OzLabs, ADL Canberra andrew.donnel...@au1.ibm.com IBM Australia Limited
Re: [PATCH] ocxl: Clarify error path in setup_xsl_irq()
On Tue, 11 Dec 2018 11:19:55 +1100 Andrew Donnellan wrote: > On 11/12/18 2:18 am, Greg Kurz wrote: > > Implementing rollback with goto and labels is a common practice that > > leads to prettier and more maintainable code. FWIW, this design pattern > > is already being used in alloc_link() a few lines below in this file. > > > > Do the same in setup_xsl_irq(). > > > > Signed-off-by: Greg Kurz > > This is good, thanks. > > Acked-by: Andrew Donnellan > Friendly ping before Xmas break :) > > --- > > drivers/misc/ocxl/link.c | 23 ++- > > 1 file changed, 14 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c > > index eed92055184d..659977a17405 100644 > > --- a/drivers/misc/ocxl/link.c > > +++ b/drivers/misc/ocxl/link.c > > @@ -273,9 +273,9 @@ static int setup_xsl_irq(struct pci_dev *dev, struct > > link *link) > > spa->irq_name = kasprintf(GFP_KERNEL, "ocxl-xsl-%x-%x-%x", > > link->domain, link->bus, link->dev); > > if (!spa->irq_name) { > > - unmap_irq_registers(spa); > > dev_err(&dev->dev, "Can't allocate name for xsl interrupt\n"); > > - return -ENOMEM; > > + rc = -ENOMEM; > > + goto err_xsl; > > } > > /* > > * At some point, we'll need to look into allowing a higher > > @@ -283,11 +283,10 @@ static int setup_xsl_irq(struct pci_dev *dev, struct > > link *link) > > */ > > spa->virq = irq_create_mapping(NULL, hwirq); > > if (!spa->virq) { > > - kfree(spa->irq_name); > > - unmap_irq_registers(spa); > > dev_err(&dev->dev, > > "irq_create_mapping failed for translation > > interrupt\n"); > > - return -EINVAL; > > + rc = -EINVAL; > > + goto err_name; > > } > > > > dev_dbg(&dev->dev, "hwirq %d mapped to virq %d\n", hwirq, spa->virq); > > @@ -295,15 +294,21 @@ static int setup_xsl_irq(struct pci_dev *dev, struct > > link *link) > > rc = request_irq(spa->virq, xsl_fault_handler, 0, spa->irq_name, > > link); > > if (rc) { > > - irq_dispose_mapping(spa->virq); > > - kfree(spa->irq_name); > > - unmap_irq_registers(spa); > > dev_err(&dev->dev, > > "request_irq failed for translation interrupt: %d\n", > > rc); > > - return -EINVAL; > > + rc = -EINVAL; > > + goto err_mapping; > > } > > return 0; > > + > > +err_mapping: > > + irq_dispose_mapping(spa->virq); > > +err_name: > > + kfree(spa->irq_name); > > +err_xsl: > > + unmap_irq_registers(spa); > > + return rc; > > } > > > > static void release_xsl_irq(struct link *link) > > >