From: Arnd Bergmann <arnd@xxxxxxxx>
Building the bpmp-debugfs driver for Arm results in a warning for stack usage:
drivers/firmware/tegra/bpmp-debugfs.c:321:16: error: stack frame size of 1224 bytes in function 'bpmp_debug_store' [-Werror,-Wframe-larger-than=]
static ssize_t bpmp_debug_store(struct file *file, const char __user *buf,
It should be possible to rearrange the code to not require two separate
buffers for the file name, but the easiest workaround is to use dynamic
allocation.
Fixes: 5e37b9c137ee ("firmware: tegra: Add support for in-band debug")
Link: https://lore.kernel.org/all/20201204193714.3134651-1-arnd@xxxxxxxxxx/
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
I sent this one in 2020 but got no reply. It still appears to be
required, please have a look.
---
drivers/firmware/tegra/bpmp-debugfs.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/firmware/tegra/bpmp-debugfs.c b/drivers/firmware/tegra/bpmp-debugfs.c
index 3e9fa4b54358..f6888cee83ee 100644
--- a/drivers/firmware/tegra/bpmp-debugfs.c
+++ b/drivers/firmware/tegra/bpmp-debugfs.c
@@ -74,28 +74,34 @@ static void seqbuf_seek(struct seqbuf *seqbuf, ssize_t offset)
static const char *get_filename(struct tegra_bpmp *bpmp,
const struct file *file, char *buf, int size)
{
- char root_path_buf[512];
+ char *root_path_buf;
const char *root_path;
- const char *filename;
+ const char *filename = NULL;
size_t root_len;
+ root_path_buf = kzalloc(512, GFP_KERNEL);
+ if (!root_path_buf)
+ goto out;
+
root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
sizeof(root_path_buf));
if (IS_ERR(root_path))
- return NULL;
+ goto out;
root_len = strlen(root_path);
filename = dentry_path(file->f_path.dentry, buf, size);
if (IS_ERR(filename))
- return NULL;
+ goto out;
if (strlen(filename) < root_len ||
strncmp(filename, root_path, root_len))
- return NULL;
+ goto out;
filename += root_len;
+out:
+ kfree(root_path_buf);
return filename;
}
--
2.29.2
