Request_region should be used with release_region, not release_resource. The local variable mem, storing the result of request_mem_region, is dropped and instead the pointer res is stored in the drvdata field of the platform device. This information is retrieved in omap_rng_remove to release the region. The drvdata field is not used elsewhere. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x,E; @@ ( *x = request_region(...) | *x = request_mem_region(...) ) ... when != release_region(x) when != x = E * release_resource(x); // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- Not compiled. drivers/char/hw_random/omap-rng.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index 06aad08..2cc755a 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -91,7 +91,7 @@ static struct hwrng omap_rng_ops = { static int __devinit omap_rng_probe(struct platform_device *pdev) { - struct resource *res, *mem; + struct resource *res; int ret; /* @@ -116,14 +116,12 @@ static int __devinit omap_rng_probe(struct platform_device *pdev) if (!res) return -ENOENT; - mem = request_mem_region(res->start, resource_size(res), - pdev->name); - if (mem == NULL) { + if (!request_mem_region(res->start, resource_size(res), pdev->name)) { ret = -EBUSY; goto err_region; } - dev_set_drvdata(&pdev->dev, mem); + dev_set_drvdata(&pdev->dev, res); rng_base = ioremap(res->start, resource_size(res)); if (!rng_base) { ret = -ENOMEM; @@ -146,7 +144,7 @@ err_register: iounmap(rng_base); rng_base = NULL; err_ioremap: - release_resource(mem); + release_mem_region(res->start, resource_size(res)); err_region: if (cpu_is_omap24xx()) { clk_disable(rng_ick); @@ -157,7 +155,7 @@ err_region: static int __exit omap_rng_remove(struct platform_device *pdev) { - struct resource *mem = dev_get_drvdata(&pdev->dev); + struct resource *res = dev_get_drvdata(&pdev->dev); hwrng_unregister(&omap_rng_ops); @@ -170,7 +168,7 @@ static int __exit omap_rng_remove(struct platform_device *pdev) clk_put(rng_ick); } - release_resource(mem); + release_mem_region(res->start, resource_size(res)); rng_base = NULL; return 0; -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
