linux-kernel - [PATCH v2] remoteproc: k3-dsp: Fix an error handling path in k3_dsp_rproc

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Message-ID: <9485e427a9041cc76cfd3dbcc34874af495e160a.1725653543.git.christophe.jaillet@wanadoo.fr>
Date: Sat,  7 Sep 2024 08:33:36 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Beleswar Padhi <b-padhi@...com>,
	Andrew Davis <afd@...com>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-remoteproc@...r.kernel.org
Subject: [PATCH v2] remoteproc: k3-dsp: Fix an error handling path in k3_dsp_rproc_probe()

If an error occurs after the k3_dsp_rproc_request_mbox() call,
mbox_free_channel() must be called, as already done in the remove function.

Instead of adding an error handling path in the probe and changing all
error handling in the function, add a new devm_add_action_or_reset() and
simplify the .remove() function.

Fixes: ea1d6fb5b571 ("remoteproc: k3-dsp: Acquire mailbox handle during probe routine")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Reviewed-by: Andrew Davis <afd@...com>
---
Compile tested only

Change in v2:
  - fix the subject (cut'n'paste issue)   [Andrew Davis]
  - add R-b tag
  
v1: https://lore.kernel.org/all/9485e127a00419c76cf13dbccf4874af395ef6ba.1725653543.git.christophe.jaillet@wanadoo.fr/
---
 drivers/remoteproc/ti_k3_dsp_remoteproc.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/ti_k3_dsp_remoteproc.c b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
index 8be3f631c192..f29780de37a5 100644
--- a/drivers/remoteproc/ti_k3_dsp_remoteproc.c
+++ b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
@@ -610,6 +610,13 @@ static void k3_dsp_release_tsp(void *data)
 	ti_sci_proc_release(tsp);
 }
 
+static void k3_dsp_free_channel(void *data)
+{
+	struct k3_dsp_rproc *kproc = data;
+
+	mbox_free_channel(kproc->mbox);
+}
+
 static int k3_dsp_rproc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -649,6 +656,10 @@ static int k3_dsp_rproc_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = devm_add_action_or_reset(dev, k3_dsp_free_channel, rproc);
+	if (ret)
+		return ret;
+
 	kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
 	if (IS_ERR(kproc->ti_sci))
 		return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
@@ -741,8 +752,6 @@ static void k3_dsp_rproc_remove(struct platform_device *pdev)
 		if (ret)
 			dev_err(dev, "failed to detach proc (%pe)\n", ERR_PTR(ret));
 	}
-
-	mbox_free_channel(kproc->mbox);
 }
 
 static const struct k3_dsp_mem_data c66_mems[] = {
-- 
2.46.0