linux-kernel - [PATCH v3 2/2] driver core: add helper for deferred probe reason setting

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Message-Id: <20210323153714.25120-2-a.fatoum@pengutronix.de>
Date:   Tue, 23 Mar 2021 16:37:13 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     kernel@...gutronix.de, Andrzej Hajda <a.hajda@...sung.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] driver core: add helper for deferred probe reason setting

We now have three places within the same file doing the same operation
of freeing this pointer and setting it anew. A helper makes this
arguably easier to read, so add one.

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
v2 -> v3:
 - fixed typo in commit message (Andy)
 - collected Andy's and Andrzej's Reviewed-by
v1 -> v2:
 - no change
---
 drivers/base/dd.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index e2cf3b29123e..4201baa1cc13 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -69,6 +69,12 @@ static char async_probe_drv_names[ASYNC_DRV_NAMES_MAX_LEN];
  */
 static bool defer_all_probes;
 
+static void __device_set_deferred_probe_reason(const struct device *dev, char *reason)
+{
+	kfree(dev->p->deferred_probe_reason);
+	dev->p->deferred_probe_reason = reason;
+}
+
 /*
  * deferred_probe_work_func() - Retry probing devices in the active list.
  */
@@ -97,8 +103,7 @@ static void deferred_probe_work_func(struct work_struct *work)
 
 		get_device(dev);
 
-		kfree(dev->p->deferred_probe_reason);
-		dev->p->deferred_probe_reason = NULL;
+		__device_set_deferred_probe_reason(dev, NULL);
 
 		/*
 		 * Drop the mutex while probing each device; the probe path may
@@ -140,8 +145,7 @@ void driver_deferred_probe_del(struct device *dev)
 	if (!list_empty(&dev->p->deferred_probe)) {
 		dev_dbg(dev, "Removed from deferred list\n");
 		list_del_init(&dev->p->deferred_probe);
-		kfree(dev->p->deferred_probe_reason);
-		dev->p->deferred_probe_reason = NULL;
+		__device_set_deferred_probe_reason(dev, NULL);
 	}
 	mutex_unlock(&deferred_probe_mutex);
 }
@@ -220,11 +224,12 @@ void device_unblock_probing(void)
 void device_set_deferred_probe_reason(const struct device *dev, struct va_format *vaf)
 {
 	const char *drv = dev_driver_string(dev);
+	char *reason;
 
 	mutex_lock(&deferred_probe_mutex);
 
-	kfree(dev->p->deferred_probe_reason);
-	dev->p->deferred_probe_reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf);
+	reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf);
+	__device_set_deferred_probe_reason(dev, reason);
 
 	mutex_unlock(&deferred_probe_mutex);
 }
-- 
2.29.2