linux-kernel - [PATCH 1/3] pinctrl: ti: ti-iodelay: Fix some error handling paths

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]

Message-ID: <0220fa5b925bd08e361be8206a5438f6229deaac.1720556038.git.christophe.jaillet@wanadoo.fr>
Date: Tue,  9 Jul 2024 22:37:43 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: linus.walleij@...aro.org,
	lokeshvutla@...com,
	nm@...com,
	robh@...nel.org,
	tony@...mide.com
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 1/3] pinctrl: ti: ti-iodelay: Fix some error handling paths

In the probe, if an error occurs after the ti_iodelay_pinconf_init_dev()
call, it is likely that ti_iodelay_pinconf_deinit_dev() should be called,
as already done in the remove function.

Also in ti_iodelay_pinconf_init_dev(), if an error occurs after the first
regmap_update_bits() call, it is also likely that the deinit() function
should be called.

The easier way to fix it is to add a devm_add_action_or_reset() at the
rigtht place to have ti_iodelay_pinconf_deinit_dev() called when needed.

Doing so, the .remove() function can be removed, and the associated
platform_set_drvdata() call in the probe as well.

Fixes: 003910ebc83b ("pinctrl: Introduce TI IOdelay configuration driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested-only.

This patch is speculative, review with care!
---
 drivers/pinctrl/ti/pinctrl-ti-iodelay.c | 52 ++++++++++---------------
 1 file changed, 21 insertions(+), 31 deletions(-)

diff --git a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
index f5e5a23d2226..451801acdc40 100644
--- a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
+++ b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
@@ -273,6 +273,22 @@ static int ti_iodelay_pinconf_set(struct ti_iodelay_device *iod,
 	return r;
 }
 
+/**
+ * ti_iodelay_pinconf_deinit_dev() - deinit the iodelay device
+ * @data:	IODelay device
+ *
+ * Deinitialize the IODelay device (basically just lock the region back up.
+ */
+static void ti_iodelay_pinconf_deinit_dev(void *data)
+{
+	struct ti_iodelay_device *iod = data;
+	const struct ti_iodelay_reg_data *reg = iod->reg_data;
+
+	/* lock the iodelay region back again */
+	regmap_update_bits(iod->regmap, reg->reg_global_lock_offset,
+			   reg->global_lock_mask, reg->global_lock_val);
+}
+
 /**
  * ti_iodelay_pinconf_init_dev() - Initialize IODelay device
  * @iod: iodelay device
@@ -295,6 +311,11 @@ static int ti_iodelay_pinconf_init_dev(struct ti_iodelay_device *iod)
 	if (r)
 		return r;
 
+	r = devm_add_action_or_reset(iod->dev, ti_iodelay_pinconf_deinit_dev,
+				     iod);
+	if (r)
+		return r;
+
 	/* Read up Recalibration sequence done by bootloader */
 	r = regmap_read(iod->regmap, reg->reg_refclk_offset, &val);
 	if (r)
@@ -353,21 +374,6 @@ static int ti_iodelay_pinconf_init_dev(struct ti_iodelay_device *iod)
 	return 0;
 }
 
-/**
- * ti_iodelay_pinconf_deinit_dev() - deinit the iodelay device
- * @iod:	IODelay device
- *
- * Deinitialize the IODelay device (basically just lock the region back up.
- */
-static void ti_iodelay_pinconf_deinit_dev(struct ti_iodelay_device *iod)
-{
-	const struct ti_iodelay_reg_data *reg = iod->reg_data;
-
-	/* lock the iodelay region back again */
-	regmap_update_bits(iod->regmap, reg->reg_global_lock_offset,
-			   reg->global_lock_mask, reg->global_lock_val);
-}
-
 /**
  * ti_iodelay_get_pingroup() - Find the group mapped by a group selector
  * @iod: iodelay device
@@ -877,27 +883,11 @@ static int ti_iodelay_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, iod);
-
 	return pinctrl_enable(iod->pctl);
 }
 
-/**
- * ti_iodelay_remove() - standard remove
- * @pdev: platform device
- */
-static void ti_iodelay_remove(struct platform_device *pdev)
-{
-	struct ti_iodelay_device *iod = platform_get_drvdata(pdev);
-
-	ti_iodelay_pinconf_deinit_dev(iod);
-
-	/* Expect other allocations to be freed by devm */
-}
-
 static struct platform_driver ti_iodelay_driver = {
 	.probe = ti_iodelay_probe,
-	.remove_new = ti_iodelay_remove,
 	.driver = {
 		   .name = DRIVER_NAME,
 		   .of_match_table = ti_iodelay_of_match,
-- 
2.45.2