Re: [PATCH V3 2/6] md: ignore discard return value

[Chaitanya Kulkarni <chaitanyak@nvidia.com>]

On 11/30/25 22:22, Chaitanya Kulkarni wrote:
> Hi Song Liu and Yu Kuai,
>
> On 11/24/25 15:48, Chaitanya Kulkarni wrote:
>> __blkdev_issue_discard() always returns 0, making all error checking at
>> call sites dead code.
>>
>> Simplify md to only check !discard_bio by ignoring the
>> __blkdev_issue_discard() value.
>>
>> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
>> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
>> Reviewed-by: Christoph Hellwig <hch@lst.de>
>> Signed-off-by: Chaitanya Kulkarni <ckulkarnilinux@gmail.com>
>> ---
>>   drivers/md/md.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/md/md.c b/drivers/md/md.c
>> index 7b5c5967568f..aeb62df39828 100644
>> --- a/drivers/md/md.c
>> +++ b/drivers/md/md.c
>> @@ -9132,8 +9132,8 @@ void md_submit_discard_bio(struct mddev *mddev, 
>> struct md_rdev *rdev,
>>   {
>>       struct bio *discard_bio = NULL;
>>   -    if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
>> -            &discard_bio) || !discard_bio)
>> +    __blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO, 
>> &discard_bio);
>> +    if (!discard_bio)
>>           return;
>>         bio_chain(discard_bio, bio);
>
>
> Gentle ping on this.
>
> -ck
>
>
Hi Song Liu and Yu Kuai,

Just pulled latest changes I don't see this patch been applied [1].
Unless my git repo is messed up.

Can you please provide review comments and let me know the blocker ?

-ck

  9169 /* This is used by raid0 and raid10 */
  9170 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev,
  9171                         struct bio *bio, sector_t start, sector_t size)
  9172 {
  9173         struct bio *discard_bio = NULL;
  9174
  9175         if (__blkdev_issue_discard(rdev->bdev, start, size, GFP_NOIO,
  9176                         &discard_bio) || !discard_bio)
  9177                 return;
  9178
  9179         bio_chain(discard_bio, bio);
  9180         bio_clone_blkg_association(discard_bio, bio);
  9181         mddev_trace_remap(mddev, discard_bio, bio->bi_iter.bi_sector);
  9182         submit_bio_noacct(discard_bio);
  9183 }
  9184 EXPORT_SYMBOL_GPL(md_submit_discard_bio);