[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230829150759.156126-2-mario.limonciello@amd.com>
Date: Tue, 29 Aug 2023 10:07:55 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: <thomas.lendacky@....com>, <herbert@...dor.apana.org.au>
CC: <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Mario Limonciello" <mario.limonciello@....com>
Subject: [PATCH v3 1/5] crypto: ccp: Get a free page to use while fetching initial nonce
dbc_dev_init() gets a free page from `GFP_KERNEL`, but if that page has
any data in it the first nonce request will fail.
This prevents dynamic boost control from probing. To fix this, explicitly
request a zeroed page with `__GFP_ZERO` to ensure first nonce fetch works.
Fixes: c04cf9e14f10 ("crypto: ccp - Add support for fetching a nonce for dynamic boost control")
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
drivers/crypto/ccp/dbc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/crypto/ccp/dbc.c b/drivers/crypto/ccp/dbc.c
index 839ea14b9a85..6f33149ef80d 100644
--- a/drivers/crypto/ccp/dbc.c
+++ b/drivers/crypto/ccp/dbc.c
@@ -205,7 +205,7 @@ int dbc_dev_init(struct psp_device *psp)
return -ENOMEM;
BUILD_BUG_ON(sizeof(union dbc_buffer) > PAGE_SIZE);
- dbc_dev->mbox = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
+ dbc_dev->mbox = (void *)devm_get_free_pages(dev, GFP_KERNEL | __GFP_ZERO, 0);
if (!dbc_dev->mbox) {
ret = -ENOMEM;
goto cleanup_dev;
--
2.34.1
Powered by blists - more mailing lists