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firmware: tegra: Reduce stack usage 

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: 5e37b9c137 ("firmware: tegra: Add support for in-band debug")
Link: https://lore.kernel.org/all/20201204193714.3134651-1-arnd@kernel.org/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[treding@nvidia.com: consistently return NULL on failure]
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Arnd Bergmann 2021-09-27 14:41:40 +02:00 committed by Thierry Reding
parent 6880fa6c56
commit 06c2d9a078
1 changed files with 17 additions and 9 deletions
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26
drivers/firmware/tegra/bpmp-debugfs.c
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@ -74,28 +74,36 @@ static void seqbuf_seek(struct seqbuf *seqbuf, ssize_t offset)
static const char *get_filename(struct tegra_bpmp *bpmp, static const char *get_filename(struct tegra_bpmp *bpmp,
const struct file *file, char *buf, int size) const struct file *file, char *buf, int size)
{ {
char root_path_buf[512]; const char *root_path, *filename = NULL;
const char *root_path; char *root_path_buf;
const char *filename;
size_t root_len; 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, root_path = dentry_path(bpmp->debugfs_mirror, root_path_buf,
sizeof(root_path_buf)); sizeof(root_path_buf));
if (IS_ERR(root_path)) if (IS_ERR(root_path))
return NULL; goto out;
root_len = strlen(root_path); root_len = strlen(root_path);
filename = dentry_path(file->f_path.dentry, buf, size); filename = dentry_path(file->f_path.dentry, buf, size);
if (IS_ERR(filename)) if (IS_ERR(filename)) {
return NULL; filename = NULL;
goto out;
}
if (strlen(filename) < root_len || if (strlen(filename) < root_len || strncmp(filename, root_path, root_len)) {
strncmp(filename, root_path, root_len)) filename = NULL;
return NULL; goto out;
}
filename += root_len; filename += root_len;
out:
kfree(root_path_buf);
return filename; return filename;
} }