diff options
| author |   Jamie Iles <jamie@jamieiles.com> | 2011-05-20 00:40:16 -0600 |
|---|---|---|
| committer |   Grant Likely <grant.likely@secretlab.ca> | 2011-05-20 00:40:16 -0600 |
| commit | 364b5e871839fafffa851bbff9ecf64ac641023c (patch) | |
| tree | 56eea04b83a0f84ba3199b64e894f1d9c9ae9fbb /drivers/gpio | |
| parent | basic_mmio_gpio: allow overriding number of gpio (diff) | |
| download | linux-dev-364b5e871839fafffa851bbff9ecf64ac641023c.tar.xz linux-dev-364b5e871839fafffa851bbff9ecf64ac641023c.zip | |
basic_mmio_gpio: request register regions
Make sure that we get the register regions with request_mem_region()
before ioremap() to make sure we have exclusive access.
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/basic_mmio_gpio.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c index 2b2d38454463..90f7f8930d5b 100644 --- a/drivers/gpio/basic_mmio_gpio.c +++ b/drivers/gpio/basic_mmio_gpio.c @@ -192,6 +192,16 @@ static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) return 0; } +static void __iomem *bgpio_request_and_map(struct device *dev, + struct resource *res) +{ + if (!devm_request_mem_region(dev, res->start, resource_size(res), + res->name ?: "mmio_gpio")) + return NULL; + + return devm_ioremap(dev, res->start, resource_size(res)); +} + static int bgpio_setup_accessors(struct platform_device *pdev, struct bgpio_chip *bgc) { @@ -258,7 +268,7 @@ static int __devinit bgpio_probe(struct platform_device *pdev) if (!bgc) return -ENOMEM; - bgc->reg_dat = devm_ioremap(dev, res_dat->start, dat_sz); + bgc->reg_dat = bgpio_request_and_map(dev, res_dat); if (!bgc->reg_dat) return -ENOMEM; @@ -269,8 +279,8 @@ static int __devinit bgpio_probe(struct platform_device *pdev) resource_size(res_set) != dat_sz) return -EINVAL; - bgc->reg_set = devm_ioremap(dev, res_set->start, dat_sz); - bgc->reg_clr = devm_ioremap(dev, res_clr->start, dat_sz); + bgc->reg_set = bgpio_request_and_map(dev, res_set); + bgc->reg_clr = bgpio_request_and_map(dev, res_clr); if (!bgc->reg_set || !bgc->reg_clr) return -ENOMEM; } else if (res_set || res_clr) { |