[PATCH 5.15 026/120] nvmem: rmem: Fix return value check in rmem_read()

Greg Kroah-Hartman
2022-12-05T19:37:15Z

From: Wei Yongjun <weiyongjun1@huawei.com>

[ Upstream commit 58e92c4a496b27156020a59a98c7f4a92c2b1533 ]

In case of error, the function memremap() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: 5a3fa75a4d9c ("nvmem: Add driver to expose reserved memory as nvmem")
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221118063840.6357-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvmem/rmem.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvmem/rmem.c b/drivers/nvmem/rmem.c
index b11c3c974b3d..80cb187f1481 100644
--- a/drivers/nvmem/rmem.c
+++ b/drivers/nvmem/rmem.c
@@ -37,9 +37,9 @@ static int rmem_read(void *context, unsigned int offset,
* but as of Dec 2020 this isn't possible on arm64.
*/
addr = memremap(priv->mem->base, available, MEMREMAP_WB);
- if (IS_ERR(addr)) {
+ if (!addr) {
dev_err(priv->dev, "Failed to remap memory region\n");
- return PTR_ERR(addr);
+ return -ENOMEM;
}

count = memory_read_from_buffer(val, bytes, &off, addr, available);
--
2.35.1