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Date: Wed, 4 Jan 2017 00:41:56 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Wim Van Sebroeck <wim@...ana.be>, linux-watchdog@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 2/4] watchdog: iTCO_wdt: Use device managed resources
On Tue, Jan 3, 2017 at 4:39 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> Using device managed resources simplifies error handling and cleanup,
> and to reduce the likelyhood of errors.
>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Does it make sense to convert to dev_err() at some point?
> ---
> drivers/watchdog/iTCO_wdt.c | 80 ++++++++++-----------------------------------
> 1 file changed, 17 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> index a35a9164ccd0..eed1dee6de19 100644
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -401,27 +401,6 @@ static const struct watchdog_ops iTCO_wdt_ops = {
> * Init & exit routines
> */
>
> -static void iTCO_wdt_cleanup(struct iTCO_wdt_private *p)
> -{
> - /* Stop the timer before we leave */
> - if (!nowayout)
> - iTCO_wdt_stop(&p->wddev);
> -
> - /* Deregister */
> - watchdog_unregister_device(&p->wddev);
> -
> - /* release resources */
> - release_region(p->tco_res->start,
> - resource_size(p->tco_res));
> - release_region(p->smi_res->start,
> - resource_size(p->smi_res));
> - if (p->iTCO_version >= 2) {
> - iounmap(p->gcs_pmc);
> - release_mem_region(p->gcs_pmc_res->start,
> - resource_size(p->gcs_pmc_res));
> - }
> -}
> -
> static int iTCO_wdt_probe(struct platform_device *dev)
> {
> struct itco_wdt_platform_data *pdata = dev_get_platdata(&dev->dev);
> @@ -458,41 +437,28 @@ static int iTCO_wdt_probe(struct platform_device *dev)
> p->gcs_pmc_res = platform_get_resource(dev,
> IORESOURCE_MEM,
> ICH_RES_MEM_GCS_PMC);
> -
> - if (!p->gcs_pmc_res)
> - return -ENODEV;
> -
> - if (!request_mem_region(p->gcs_pmc_res->start,
> - resource_size(p->gcs_pmc_res),
> - dev->name))
> - return -EBUSY;
> -
> - p->gcs_pmc = ioremap(p->gcs_pmc_res->start,
> - resource_size(p->gcs_pmc_res));
> - if (!p->gcs_pmc) {
> - ret = -EIO;
> - goto unreg_gcs_pmc;
> - }
> + p->gcs_pmc = devm_ioremap_resource(&dev->dev, p->gcs_pmc_res);
> + if (IS_ERR(p->gcs_pmc))
> + return PTR_ERR(p->gcs_pmc);
> }
>
> /* Check chipset's NO_REBOOT bit */
> if (iTCO_wdt_unset_NO_REBOOT_bit(p) &&
> iTCO_vendor_check_noreboot_on()) {
> pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
> - ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
> - goto unmap_gcs_pmc;
> + return -ENODEV; /* Cannot reset NO_REBOOT bit */
> }
>
> /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
> iTCO_wdt_set_NO_REBOOT_bit(p);
>
> /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
> - if (!request_region(p->smi_res->start,
> - resource_size(p->smi_res), dev->name)) {
> + if (!devm_request_region(&dev->dev, p->smi_res->start,
> + resource_size(p->smi_res),
> + dev->name)) {
> pr_err("I/O address 0x%04llx already in use, device disabled\n",
> (u64)SMI_EN(p));
> - ret = -EBUSY;
> - goto unmap_gcs_pmc;
> + return -EBUSY;
> }
> if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
> /*
> @@ -504,12 +470,12 @@ static int iTCO_wdt_probe(struct platform_device *dev)
> outl(val32, SMI_EN(p));
> }
>
> - if (!request_region(p->tco_res->start,
> - resource_size(p->tco_res), dev->name)) {
> + if (!devm_request_region(&dev->dev, p->tco_res->start,
> + resource_size(p->tco_res),
> + dev->name)) {
> pr_err("I/O address 0x%04llx already in use, device disabled\n",
> (u64)TCOBASE(p));
> - ret = -EBUSY;
> - goto unreg_smi;
> + return -EBUSY;
> }
>
> pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n",
> @@ -555,37 +521,25 @@ static int iTCO_wdt_probe(struct platform_device *dev)
> WATCHDOG_TIMEOUT);
> }
>
> - ret = watchdog_register_device(&p->wddev);
> + ret = devm_watchdog_register_device(&dev->dev, &p->wddev);
> if (ret != 0) {
> pr_err("cannot register watchdog device (err=%d)\n", ret);
> - goto unreg_tco;
> + return ret;
> }
>
> pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
> heartbeat, nowayout);
>
> return 0;
> -
> -unreg_tco:
> - release_region(p->tco_res->start, resource_size(p->tco_res));
> -unreg_smi:
> - release_region(p->smi_res->start, resource_size(p->smi_res));
> -unmap_gcs_pmc:
> - if (p->iTCO_version >= 2)
> - iounmap(p->gcs_pmc);
> -unreg_gcs_pmc:
> - if (p->iTCO_version >= 2)
> - release_mem_region(p->gcs_pmc_res->start,
> - resource_size(p->gcs_pmc_res));
> - return ret;
> }
>
> static int iTCO_wdt_remove(struct platform_device *dev)
> {
> struct iTCO_wdt_private *p = platform_get_drvdata(dev);
>
> - if (p->tco_res || p->smi_res)
> - iTCO_wdt_cleanup(p);
> + /* Stop the timer before we leave */
> + if (!nowayout)
> + iTCO_wdt_stop(&p->wddev);
>
> return 0;
> }
> --
> 2.7.4
>
--
With Best Regards,
Andy Shevchenko
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