linux-kernel - [PATCH 2/5] staging: fsl-mc: abstract test for whether a dprc is a root dprc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 4 Oct 2015 10:09:51 +0300
From:	<itai.katz@...escale.com>
To:	<gregkh@...uxfoundation.org>, <arnd@...db.de>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>
CC:	<stuart.yoder@...escale.com>, <german.rivera@...escale.com>,
	<lijun.pan@...escale.com>, <scottwood@...escale.com>,
	<agraf@...e.de>, <bhamciu1@...escale.com>, <R89243@...escale.com>,
	<bhupesh.sharma@...escale.com>, <nir.erez@...escale.com>,
	<richard.schmitt@...escale.com>, <dan.carpenter@...cle.com>,
	Itai Katz <itai.katz@...escale.com>
Subject: [PATCH 2/5] staging: fsl-mc: abstract test for whether a dprc is a root dprc

From: Itai Katz <itai.katz@...escale.com>

Instead of relying on assumptions about fields in data
structures, abstract the test for whether a dprc is a root
dprc into a function.

Signed-off-by: Itai Katz <itai.katz@...escale.com>
---
 drivers/staging/fsl-mc/bus/mc-bus.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/mc-bus.c b/drivers/staging/fsl-mc/bus/mc-bus.c
index 2aaeb3a..6a6c5a6 100644
--- a/drivers/staging/fsl-mc/bus/mc-bus.c
+++ b/drivers/staging/fsl-mc/bus/mc-bus.c
@@ -22,6 +22,8 @@
 
 static struct kmem_cache *mc_dev_cache;
 
+static bool fsl_mc_is_root_dprc(struct device *dev);
+
 /**
  * fsl_mc_bus_match - device to driver matching callback
  * @dev: the MC object device structure to match against
@@ -50,7 +52,7 @@ static int fsl_mc_bus_match(struct device *dev, struct device_driver *drv)
 	 * Only exception is the root DPRC, which is a special case.
 	 */
 	if ((mc_dev->obj_desc.state & DPRC_OBJ_STATE_PLUGGED) == 0 &&
-	    &mc_dev->dev != fsl_mc_bus_type.dev_root)
+	    !fsl_mc_is_root_dprc(&mc_dev->dev))
 		goto out;
 
 	/*
@@ -215,6 +217,14 @@ bool fsl_mc_bus_exists(void)
 }
 EXPORT_SYMBOL_GPL(fsl_mc_bus_exists);
 
+/**
+ * fsl_mc_is_root_dprc - function to check if a given device is a root dprc
+ */
+static bool fsl_mc_is_root_dprc(struct device *dev)
+{
+	return dev == fsl_mc_bus_type.dev_root;
+}
+
 static int get_dprc_icid(struct fsl_mc_io *mc_io,
 			 int container_id, u16 *icid)
 {
@@ -500,7 +510,7 @@ void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
 			mc_dev->mc_io = NULL;
 		}
 
-		if (&mc_dev->dev == fsl_mc_bus_type.dev_root)
+		if (fsl_mc_is_root_dprc(&mc_dev->dev))
 			fsl_mc_bus_type.dev_root = NULL;
 	}
 
@@ -726,7 +736,7 @@ static int fsl_mc_bus_remove(struct platform_device *pdev)
 {
 	struct fsl_mc *mc = platform_get_drvdata(pdev);
 
-	if (WARN_ON(&mc->root_mc_bus_dev->dev != fsl_mc_bus_type.dev_root))
+	if (WARN_ON(!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev)))
 		return -EINVAL;
 
 	fsl_mc_device_remove(mc->root_mc_bus_dev);
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/