linux-kernel - [RESEND PATCH v6 4/4] mailbox: tegra-hsp: use devm_kstrdup

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Date:   Sun, 14 Oct 2018 17:20:10 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>
Subject: [RESEND PATCH v6 4/4] mailbox: tegra-hsp: use devm_kstrdup_const()

Use devm_kstrdup_const() in the tegra-hsp driver. This mostly serves as
an example of how to use this new routine to shrink driver code.

Also use devm_kzalloc() instead of regular kzalloc() to get shrink the
driver even more.

Doorbell objects are only removed in the driver's remove callback so
it's safe to convert all memory allocations to devres.

Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
---
 drivers/mailbox/tegra-hsp.c | 41 ++++++++-----------------------------
 1 file changed, 9 insertions(+), 32 deletions(-)

diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index 0cde356c11ab..106c94dedbf1 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -183,14 +183,15 @@ static irqreturn_t tegra_hsp_doorbell_irq(int irq, void *data)
 }
 
 static struct tegra_hsp_channel *
-tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
-			  unsigned int master, unsigned int index)
+tegra_hsp_doorbell_create(struct device *dev, struct tegra_hsp *hsp,
+			  const char *name, unsigned int master,
+			  unsigned int index)
 {
 	struct tegra_hsp_doorbell *db;
 	unsigned int offset;
 	unsigned long flags;
 
-	db = kzalloc(sizeof(*db), GFP_KERNEL);
+	db = devm_kzalloc(dev, sizeof(*db), GFP_KERNEL);
 	if (!db)
 		return ERR_PTR(-ENOMEM);
 
@@ -200,7 +201,7 @@ tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
 	db->channel.regs = hsp->regs + offset;
 	db->channel.hsp = hsp;
 
-	db->name = kstrdup_const(name, GFP_KERNEL);
+	db->name = devm_kstrdup_const(dev, name, GFP_KERNEL);
 	db->master = master;
 	db->index = index;
 
@@ -211,13 +212,6 @@ tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
 	return &db->channel;
 }
 
-static void __tegra_hsp_doorbell_destroy(struct tegra_hsp_doorbell *db)
-{
-	list_del(&db->list);
-	kfree_const(db->name);
-	kfree(db);
-}
-
 static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
 {
 	struct tegra_hsp_doorbell *db = chan->con_priv;
@@ -332,31 +326,16 @@ static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
 	return chan ?: ERR_PTR(-EBUSY);
 }
 
-static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
-{
-	struct tegra_hsp_doorbell *db, *tmp;
-	unsigned long flags;
-
-	spin_lock_irqsave(&hsp->lock, flags);
-
-	list_for_each_entry_safe(db, tmp, &hsp->doorbells, list)
-		__tegra_hsp_doorbell_destroy(db);
-
-	spin_unlock_irqrestore(&hsp->lock, flags);
-}
-
-static int tegra_hsp_add_doorbells(struct tegra_hsp *hsp)
+static int tegra_hsp_add_doorbells(struct device *dev, struct tegra_hsp *hsp)
 {
 	const struct tegra_hsp_db_map *map = hsp->soc->map;
 	struct tegra_hsp_channel *channel;
 
 	while (map->name) {
-		channel = tegra_hsp_doorbell_create(hsp, map->name,
+		channel = tegra_hsp_doorbell_create(dev, hsp, map->name,
 						    map->master, map->index);
-		if (IS_ERR(channel)) {
-			tegra_hsp_remove_doorbells(hsp);
+		if (IS_ERR(channel))
 			return PTR_ERR(channel);
-		}
 
 		map++;
 	}
@@ -412,7 +391,7 @@ static int tegra_hsp_probe(struct platform_device *pdev)
 	if (!hsp->mbox.chans)
 		return -ENOMEM;
 
-	err = tegra_hsp_add_doorbells(hsp);
+	err = tegra_hsp_add_doorbells(&pdev->dev, hsp);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to add doorbells: %d\n", err);
 		return err;
@@ -423,7 +402,6 @@ static int tegra_hsp_probe(struct platform_device *pdev)
 	err = mbox_controller_register(&hsp->mbox);
 	if (err) {
 		dev_err(&pdev->dev, "failed to register mailbox: %d\n", err);
-		tegra_hsp_remove_doorbells(hsp);
 		return err;
 	}
 
@@ -443,7 +421,6 @@ static int tegra_hsp_remove(struct platform_device *pdev)
 	struct tegra_hsp *hsp = platform_get_drvdata(pdev);
 
 	mbox_controller_unregister(&hsp->mbox);
-	tegra_hsp_remove_doorbells(hsp);
 
 	return 0;
 }
-- 
2.19.1