Re: [PATCH] drm/nouveau/debugfs: Simplify character output in nouveau_debugfs_vbios_image()

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Le 15/07/2024 à 15:15, Ilia Mirkin a écrit :
On Mon, Jul 15, 2024 at 7:49 AM Markus Elfring <Markus.Elfring@xxxxxx> wrote:

From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 15 Jul 2024 13:36:54 +0200

Single characters should be put into a sequence.
Thus use the corresponding function “seq_putc” for one selected call.

This issue was transformed by using the Coccinelle software.

Suggested-by: Christophe Jaillet <christophe.jaillet@xxxxxxxxxx>
Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/nouveau/nouveau_debugfs.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index e83db051e851..931b62097366 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -42,7 +42,7 @@ nouveau_debugfs_vbios_image(struct seq_file *m, void *data)
         int i;

         for (i = 0; i < drm->vbios.length; i++)
-               seq_printf(m, "%c", drm->vbios.data[i]);
+               seq_putc(m, drm->vbios.data[i]);

Is there some reason this whole thing isn't just

seq_write(m, drm->vbios.data, drm->vbios.length)

Hi,

I don't know if my answer is relevant or not here but:
	for () seq_putc();	==> will fill 'm' with everything that fits in
and
seq_write() ==> is all or nothing. So if 'm' is too small, then nothing will be appended.

I've not looked at the calling tree, but I would expect 'm' to be able to have PAGE_SIZE chars, so most probably 4096.

And having gpu + "vbios.rom", I would expect it to be bigger than 4096.

If I'm correct, then changing for seq_write() would just show... nothing.


I don't know if it can happen., but testing should be easy enough to figure it out.

just my 2c.

CJ




         return 0;
  }

--
2.45.2








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