linux-kernel - [PATCH 02/22] lp8727_charger: cleanup _probe() and

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>] [day] [month] [year] [list]

Date:	Fri, 31 Aug 2012 09:23:03 +0000
From:	"Kim, Milo" <Milo.Kim@...com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
CC:	David Woodhouse <dwmw2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 02/22] lp8727_charger: cleanup _probe() and _remove()

 If the lp8727_register_psy() gets failed, registered interrupt handler
 should be freed, but this is not complete solution.
 It has still problem.
 Assume that the IRQ occurs while unregistering power supply devices.
 Then the ISR will access to freed IRQ.

 From Anton's opinion, it can be resolved if re-ordering the call sequence.

 Register power supplies first, then create interrupt handler.
 Then no need to free the IRQ in _probe().
 Additionally goto statements can be removed because those can be replaced with
 return statements.

 The _remove() should be changed the sequence - in reverse order of _probe()

Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>
---
 drivers/power/lp8727_charger.c |   20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c
index 0d3cb1d..b2df114 100644
--- a/drivers/power/lp8727_charger.c
+++ b/drivers/power/lp8727_charger.c
@@ -442,35 +442,33 @@ static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 	ret = lp8727_init_device(pchg);
 	if (ret) {
 		dev_err(pchg->dev, "i2c communication err: %d", ret);
-		goto error;
+		return ret;
 	}
 
-	ret = lp8727_intr_config(pchg);
+	ret = lp8727_register_psy(pchg);
 	if (ret) {
-		dev_err(pchg->dev, "irq handler err: %d", ret);
-		goto error;
+		dev_err(pchg->dev, "power supplies register err: %d", ret);
+		return ret;
 	}
 
-	ret = lp8727_register_psy(pchg);
+	ret = lp8727_intr_config(pchg);
 	if (ret) {
-		dev_err(pchg->dev, "power supplies register err: %d", ret);
-		goto error;
+		dev_err(pchg->dev, "irq handler err: %d", ret);
+		lp8727_unregister_psy(pchg);
+		return ret;
 	}
 
 	return 0;
-
-error:
-	return ret;
 }
 
 static int __devexit lp8727_remove(struct i2c_client *cl)
 {
 	struct lp8727_chg *pchg = i2c_get_clientdata(cl);
 
-	lp8727_unregister_psy(pchg);
 	free_irq(pchg->client->irq, pchg);
 	flush_workqueue(pchg->irqthread);
 	destroy_workqueue(pchg->irqthread);
+	lp8727_unregister_psy(pchg);
 	return 0;
 }
 
-- 
1.7.9.5


Best Regards,
Milo


--
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/