From: Mario Limonciello <mario.limonciello@amd.com> stable inclusion from stable-v6.6.2 commit 4c2c057d771c956c6a4504a46ed416725bbe50ee category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ 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> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.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; -- 2.20.1