Re: [PATCH] scsi: st: use kzalloc_array

[Damien Le Moal <dlemoal@kernel.org>]

On 7/4/26 04:06, Rosen Penev wrote:
> On Tue, Jun 30, 2026 at 12:28 AM Damien Le Moal <dlemoal@kernel.org> wrote:
>>
>> On 6/30/26 10:21, Rosen Penev wrote:
>>> Signed-off-by: Rosen Penev <rosenp@gmail.com>
>>
>> No commit message ? Please explain your reasonning, because I find this patch
>> incorrect. See below.
>>
>>> ---
>>>  drivers/scsi/st.c | 12 +++---------
>>>  drivers/scsi/st.h |  3 ++-
>>>  2 files changed, 5 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
>>> index f1c3c4946637..31ae189b18e7 100644
>>> --- a/drivers/scsi/st.c
>>> +++ b/drivers/scsi/st.c
>>> @@ -149,7 +149,7 @@ static struct st_dev_parm {
>>>     mode counts */
>>>  static const char *st_formats[] = {
>>>       "",  "r", "k", "s", "l", "t", "o", "u",
>>> -     "m", "v", "p", "x", "a", "y", "q", "z"};
>>> +     "m", "v", "p", "x", "a", "y", "q", "z"};
>>>
>>>  /* The default definitions have been moved to st_options.h */
>>>
>>> @@ -3973,21 +3973,15 @@ static struct st_buffer *new_tape_buffer(int max_sg)
>>>  {
>>>       struct st_buffer *tb;
>>>
>>> -     tb = kzalloc_obj(struct st_buffer);
>>> +     tb = kzalloc_flex(*tb, reserved_pages, max_sg);
>>>       if (!tb) {
>>>               printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
>>>               return NULL;
>>>       }
>>> -     tb->frp_segs = 0;
>>>       tb->use_sg = max_sg;
>>> +     tb->frp_segs = 0;
>>>       tb->buffer_size = 0;
>>>
>>> -     tb->reserved_pages = kzalloc_objs(struct page *, max_sg);
>>
>> reserve_pages is in the middle of struct st_buffer so you cannot use a flex array.
> This patch moves it, no?

Do! Completely missed that. Looks good then, but please write a commit message.

-- 
Damien Le Moal
Western Digital Research