linux-kernel - [PATCH 4.9 072/245] crypto: nx - Fix RCU warning in nx842_OF_upd

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Date:   Mon, 19 Jul 2021 16:50:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 072/245] crypto: nx - Fix RCU warning in nx842_OF_upd_status

From: Herbert Xu <herbert@...dor.apana.org.au>

[ Upstream commit 2a96726bd0ccde4f12b9b9a9f61f7b1ac5af7e10 ]

The function nx842_OF_upd_status triggers a sparse RCU warning when
it directly dereferences the RCU-protected devdata.  This appears
to be an accident as there was another variable of the same name
that was passed in from the caller.

After it was removed (because the main purpose of using it, to
update the status member was itself removed) the global variable
unintenionally stood in as its replacement.

This patch restores the devdata parameter.

Fixes: 90fd73f912f0 ("crypto: nx - remove pSeries NX 'status' field")
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/crypto/nx/nx-842-pseries.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/nx/nx-842-pseries.c b/drivers/crypto/nx/nx-842-pseries.c
index 2e5b4004f0ee..1b8c87770645 100644
--- a/drivers/crypto/nx/nx-842-pseries.c
+++ b/drivers/crypto/nx/nx-842-pseries.c
@@ -553,13 +553,15 @@ static int nx842_OF_set_defaults(struct nx842_devdata *devdata)
  * The status field indicates if the device is enabled when the status
  * is 'okay'.  Otherwise the device driver will be disabled.
  *
- * @prop - struct property point containing the maxsyncop for the update
+ * @devdata: struct nx842_devdata to use for dev_info
+ * @prop: struct property point containing the maxsyncop for the update
  *
  * Returns:
  *  0 - Device is available
  *  -ENODEV - Device is not available
  */
-static int nx842_OF_upd_status(struct property *prop)
+static int nx842_OF_upd_status(struct nx842_devdata *devdata,
+			       struct property *prop)
 {
 	const char *status = (const char *)prop->value;
 
@@ -773,7 +775,7 @@ static int nx842_OF_upd(struct property *new_prop)
 		goto out;
 
 	/* Perform property updates */
-	ret = nx842_OF_upd_status(status);
+	ret = nx842_OF_upd_status(new_devdata, status);
 	if (ret)
 		goto error_out;
 
-- 
2.30.2