linux-kernel - [PATCH] remoteproc: k3-r5: Jump to error handling labels in start/stop errors

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Date: Mon, 6 May 2024 19:48:49 +0530
From: Beleswar Padhi <b-padhi@...com>
To: <andersson@...nel.org>
CC: <mathieu.poirier@...aro.org>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dan.carpenter@...aro.org>,
        <hnagalla@...com>, <devarsht@...com>, <nm@...com>, <s-anna@...com>,
        <u-kumar1@...com>
Subject: [PATCH] remoteproc: k3-r5: Jump to error handling labels in start/stop errors

In case of errors during core start operation from sysfs, the driver
directly returns with the -EPERM error code. Fix this to ensure that
mailbox channels are freed on error before returning by jumping to the
'put_mbox' error handling label. Similarly, jump to the 'out' error
handling label to return with required -EPERM error code during the
core stop operation from sysfs.

Fixes: 3c8a9066d584 ("remoteproc: k3-r5: Do not allow core1 to power up before core0 via sysfs")

Signed-off-by: Beleswar Padhi <b-padhi@...com>
---
As stated in the bug-report[0], Smatch complains that:
drivers/remoteproc/ti_k3_r5_remoteproc.c:583 k3_r5_rproc_start() warn: missing unwind goto?
drivers/remoteproc/ti_k3_r5_remoteproc.c:651 k3_r5_rproc_stop() warn: missing unwind goto?

This patch addresses the warnings by jumping to appropriate error
labels in case an error occurs during start/stop operation from sysfs.

[0]-https://lore.kernel.org/all/acc4f7a0-3bb5-4842-95a5-fb3c3fc8554b@moroto.mountain/

 drivers/remoteproc/ti_k3_r5_remoteproc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
index 1799b4f6d11e..50e486bcfa10 100644
--- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
+++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
@@ -580,7 +580,8 @@ static int k3_r5_rproc_start(struct rproc *rproc)
 		if (core != core0 && core0->rproc->state == RPROC_OFFLINE) {
 			dev_err(dev, "%s: can not start core 1 before core 0\n",
 				__func__);
-			return -EPERM;
+			ret = -EPERM;
+			goto put_mbox;
 		}
 
 		ret = k3_r5_core_run(core);
@@ -648,7 +649,8 @@ static int k3_r5_rproc_stop(struct rproc *rproc)
 		if (core != core1 && core1->rproc->state != RPROC_OFFLINE) {
 			dev_err(dev, "%s: can not stop core 0 before core 1\n",
 				__func__);
-			return -EPERM;
+			ret = -EPERM;
+			goto out;
 		}
 
 		ret = k3_r5_core_halt(core);
-- 
2.34.1