Messages in this thread Patch in this message | | | From | Jingoo Han <> | Subject | Re: [PATCH V2 7/7] watchdog: ts72xx_wdt: use devm_*() functions | Date | Thu, 02 May 2013 09:20:14 +0900 |
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On Wednesday, May 01, 2013 12:06 AM, Guenter Roeck wrote: > On Tue, Apr 30, 2013 at 02:02:25PM +0900, Jingoo Han wrote: > > Use devm_*() functions to make cleanup paths simpler. > > > > Signed-off-by: Jingoo Han <jg1.han@samsung.com> > > --- > > No changes since v1: > > > Side note: If you make no changes, there is no need to send V2, especially not > one marked as another version. Usually, when I do that kind of thing, I just > resend. > > This also applies if you get a Reviewed-by:, Acked-by:, or similar response. > You can leave it up to the maintainer to add those to the patch. > > > drivers/watchdog/ts72xx_wdt.c | 64 +++++++---------------------------------- > > 1 files changed, 11 insertions(+), 53 deletions(-) > > > > diff --git a/drivers/watchdog/ts72xx_wdt.c b/drivers/watchdog/ts72xx_wdt.c > > index b8a9245..b19ca75 100644 > > --- a/drivers/watchdog/ts72xx_wdt.c > > +++ b/drivers/watchdog/ts72xx_wdt.c > > @@ -396,7 +396,7 @@ static int ts72xx_wdt_probe(struct platform_device *pdev) > > struct resource *r1, *r2; > > int error = 0; > > > > - wdt = kzalloc(sizeof(struct ts72xx_wdt), GFP_KERNEL); > > + wdt = devm_kzalloc(&pdev->dev, sizeof(struct ts72xx_wdt), GFP_KERNEL); > > if (!wdt) { > > dev_err(&pdev->dev, "failed to allocate memory\n"); > > My understanding from other conversations is that this error message is no > longer needed.
The error message for devm_ioremap_resource() is not necessary, however, the error message for devm_kzalloc() is necessary. In devm_kzalloc(), there is no error message. It just return NULL, when it fails as below:
./drivers/base/devres.c
773 void * devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) 774 { 775 struct devres *dr; 776 777 /* use raw alloc_dr for kmalloc caller tracing */ 778 dr = alloc_dr(devm_kzalloc_release, size, gfp); 779 if (unlikely(!dr)) 780 return NULL; 781 782 set_node_dbginfo(&dr->node, "devm_kzalloc_release", size); 783 devres_add(dev, dr->data); 784 return dr->data; 785 } 786 EXPORT_SYMBOL_GPL(devm_kzalloc);
> > > return -ENOMEM; > > @@ -405,44 +405,22 @@ static int ts72xx_wdt_probe(struct platform_device *pdev) > > r1 = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > if (!r1) { > > dev_err(&pdev->dev, "failed to get memory resource\n"); > > - error = -ENODEV; > > - goto fail; > > - } > > - > > - r1 = request_mem_region(r1->start, resource_size(r1), pdev->name); > > - if (!r1) { > > - dev_err(&pdev->dev, "cannot request memory region\n"); > > - error = -EBUSY; > > - goto fail; > > + return -ENODEV; > > } > > > > - wdt->control_reg = ioremap(r1->start, resource_size(r1)); > > - if (!wdt->control_reg) { > > - dev_err(&pdev->dev, "failed to map memory\n"); > > - error = -ENODEV; > > - goto fail_free_control; > > - } > > + wdt->control_reg = devm_ioremap_resource(&pdev->dev, r1); > > + if (IS_ERR(wdt->control_reg)) > > + return PTR_ERR(wdt->control_reg); > > > > r2 = platform_get_resource(pdev, IORESOURCE_MEM, 1); > > if (!r2) { > > dev_err(&pdev->dev, "failed to get memory resource\n"); > > - error = -ENODEV; > > - goto fail_unmap_control; > > + return -ENODEV; > > } > > > > - r2 = request_mem_region(r2->start, resource_size(r2), pdev->name); > > - if (!r2) { > > - dev_err(&pdev->dev, "cannot request memory region\n"); > > - error = -EBUSY; > > - goto fail_unmap_control; > > - } > > - > > - wdt->feed_reg = ioremap(r2->start, resource_size(r2)); > > - if (!wdt->feed_reg) { > > - dev_err(&pdev->dev, "failed to map memory\n"); > > - error = -ENODEV; > > - goto fail_free_feed; > > - } > > + wdt->feed_reg = devm_ioremap_resource(&pdev->dev, r2); > > + if (IS_ERR(wdt->feed_reg)) > > + return PTR_ERR(wdt->feed_reg); > > > > platform_set_drvdata(pdev, wdt); > > ts72xx_wdt_pdev = pdev; > > @@ -455,45 +433,25 @@ static int ts72xx_wdt_probe(struct platform_device *pdev) > > error = misc_register(&ts72xx_wdt_miscdev); > > if (error) { > > dev_err(&pdev->dev, "failed to register miscdev\n"); > > - goto fail_unmap_feed; > > + goto fail; > > } > > > > dev_info(&pdev->dev, "TS-72xx Watchdog driver\n"); > > > > return 0; > > > > -fail_unmap_feed: > > - platform_set_drvdata(pdev, NULL); > > - iounmap(wdt->feed_reg); > > -fail_free_feed: > > - release_mem_region(r2->start, resource_size(r2)); > > -fail_unmap_control: > > - iounmap(wdt->control_reg); > > -fail_free_control: > > - release_mem_region(r1->start, resource_size(r1)); > > fail: > > - kfree(wdt); > > + platform_set_drvdata(pdev, NULL); > > platform_set_drvdata(pdev, NULL); > > is not needed. By eliminating it you could get rid of the entire error path.
OK, I will remove it. Thank you.
Best regards, Jingoo Han
> > > return error; > > } > > > > static int ts72xx_wdt_remove(struct platform_device *pdev) > > { > > - struct ts72xx_wdt *wdt = platform_get_drvdata(pdev); > > - struct resource *res; > > int error; > > > > error = misc_deregister(&ts72xx_wdt_miscdev); > > platform_set_drvdata(pdev, NULL); > > > > - iounmap(wdt->feed_reg); > > - res = platform_get_resource(pdev, IORESOURCE_MEM, 1); > > - release_mem_region(res->start, resource_size(res)); > > - > > - iounmap(wdt->control_reg); > > - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > - release_mem_region(res->start, resource_size(res)); > > - > > - kfree(wdt); > > return error; > > } > > > > -- > > 1.7.2.5 > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > >
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