crypto: ccp - Get a free page to use while fetching initial nonce

[ Upstream commit 53f7f779f45cbe1771bc4ae05f0320e204a18611 ]

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@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/ccp/dbc.c b/drivers/crypto/ccp/dbc.c
index 839ea14..6f33149 100644 (file)
--- 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;