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Date: Sun, 24 Oct 2021 13:03:02 +1300
From: Michael Schmitz <schmitzmic@...il.com>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
Luis Chamberlain <mcgrof@...nel.org>
Cc: linux-raid@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, axboe@...nel.dk, hch@....de,
efremov@...ux.com, song@...nel.org, jejb@...ux.ibm.com,
martin.petersen@...cle.com, viro@...iv.linux.org.uk, hare@...e.de,
jack@...e.cz, ming.lei@...hat.com, tj@...nel.org
Subject: Re: [PATCH v3 0/3] last batch of add_disk() error handling
conversions
Hi Tetsuo,
On 22/10/21 14:06, Tetsuo Handa wrote:
> On 2021/10/22 1:38, Luis Chamberlain wrote:
>> I rebased Tetsuo Handa's patch onto the latest linux-next as this
>> series depends on it, and so I am sending it part of this series as
>> without it, this won't apply. Tetsuo, does the rebase of your patch
>> look OK?
>
> OK, though I wanted my fix to be sent to upstream and stable before this series.
>
>>
>> If it is not too much trouble, I'd like to ask for testing for the
>> ataflop changes from Michael Schmitz, if possible, that is he'd just
>> have to merge Tetsuo's rebased patch and the 2nd patch in this series.
>> This is all rebased on linux-next tag 20211020.
>
> Yes, please.
Took a little convincing (patch 2 didn't apply cleanly by 'git am' on
yesterday's top of linux-next), but works just fine, thanks.
I'll submit another patch with ataflop fixes that were used in my tests,
but nothing in that interacts with your patches at all.
Tested-by: Michael Schmitz <schmitzmic@...il.com>
> After this series, I guess we can remove "bool registered[NUM_DISK_MINORS];" like below
> due to (unit[drive].disk[type] != NULL) == (unit[drive].registered[type] == true).
> Regarding this series, setting unit[drive].registered[type] = true in ataflop_probe() is
> pointless because atari_floppy_cleanup() checks unit[i].disk[type] != NULL for calling
> del_gendisk(). And we need to fix __register_blkdev() in driver/block/floppy.c because
> floppy_probe_lock is pointless.
>
> drivers/block/ataflop.c | 75 +++++++++++++++--------------------------
> 1 file changed, 28 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
> index c58750dcc685..7fedf8506335 100644
> --- a/drivers/block/ataflop.c
> +++ b/drivers/block/ataflop.c
> @@ -299,7 +299,6 @@ static struct atari_floppy_struct {
> disk change detection) */
> int flags; /* flags */
> struct gendisk *disk[NUM_DISK_MINORS];
> - bool registered[NUM_DISK_MINORS];
> int ref;
> int type;
> struct blk_mq_tag_set tag_set;
> @@ -1988,41 +1987,20 @@ static int ataflop_probe(dev_t dev)
> if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS)
> return -EINVAL;
>
> - if (!unit[drive].disk[type]) {
> - err = ataflop_alloc_disk(drive, type);
> - if (err == 0) {
> - err = add_disk(unit[drive].disk[type]);
> - if (err) {
> - blk_cleanup_disk(unit[drive].disk[type]);
> - unit[drive].disk[type] = NULL;
> - } else
> - unit[drive].registered[type] = true;
> + if (unit[drive].disk[type])
> + return 0;
> + err = ataflop_alloc_disk(drive, type);
> + if (err == 0) {
> + err = add_disk(unit[drive].disk[type]);
> + if (err) {
> + blk_cleanup_disk(unit[drive].disk[type]);
> + unit[drive].disk[type] = NULL;
> }
> }
>
> return err;
> }
>
> -static void atari_floppy_cleanup(void)
> -{
> - int i;
> - int type;
> -
> - for (i = 0; i < FD_MAX_UNITS; i++) {
> - for (type = 0; type < NUM_DISK_MINORS; type++) {
> - if (!unit[i].disk[type])
> - continue;
> - del_gendisk(unit[i].disk[type]);
> - blk_cleanup_queue(unit[i].disk[type]->queue);
> - put_disk(unit[i].disk[type]);
> - }
> - blk_mq_free_tag_set(&unit[i].tag_set);
> - }
> -
> - del_timer_sync(&fd_timer);
> - atari_stram_free(DMABuffer);
> -}
> -
> static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs)
> {
> int type;
> @@ -2030,13 +2008,24 @@ static void atari_cleanup_floppy_disk(struct atari_floppy_struct *fs)
> for (type = 0; type < NUM_DISK_MINORS; type++) {
> if (!fs->disk[type])
> continue;
> - if (fs->registered[type])
> - del_gendisk(fs->disk[type]);
> + del_gendisk(fs->disk[type]);
> blk_cleanup_disk(fs->disk[type]);
> }
> blk_mq_free_tag_set(&fs->tag_set);
> }
>
> +static void atari_floppy_cleanup(void)
> +{
> + int i;
> +
> + for (i = 0; i < FD_MAX_UNITS; i++)
> + atari_cleanup_floppy_disk(&unit[i]);
> +
> + del_timer_sync(&fd_timer);
> + if (DMABuffer)
> + atari_stram_free(DMABuffer);
> +}
> +
> static int __init atari_floppy_init (void)
> {
> int i;
> @@ -2055,13 +2044,10 @@ static int __init atari_floppy_init (void)
> unit[i].tag_set.numa_node = NUMA_NO_NODE;
> unit[i].tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
> ret = blk_mq_alloc_tag_set(&unit[i].tag_set);
> - if (ret)
> - goto err;
> -
> - ret = ataflop_alloc_disk(i, 0);
> if (ret) {
> - blk_mq_free_tag_set(&unit[i].tag_set);
> - goto err;
> + while (--i >= 0)
> + blk_mq_free_tag_set(&unit[i].tag_set);
> + return ret;
> }
> }
>
> @@ -2090,10 +2076,9 @@ static int __init atari_floppy_init (void)
> for (i = 0; i < FD_MAX_UNITS; i++) {
> unit[i].track = -1;
> unit[i].flags = 0;
> - ret = add_disk(unit[i].disk[0]);
> - if (ret)
> - goto err_out_dma;
> - unit[i].registered[0] = true;
> + ret = ataflop_probe(MKDEV(0, 1 << 2));
> + if (err)
> + goto err;
> }
>
> printk(KERN_INFO "Atari floppy driver: max. %cD, %strack buffering\n",
> @@ -2108,12 +2093,8 @@ static int __init atari_floppy_init (void)
> }
> return ret;
>
> -err_out_dma:
> - atari_stram_free(DMABuffer);
> err:
> - while (--i >= 0)
> - atari_cleanup_floppy_disk(&unit[i]);
> -
> + atari_floppy_cleanup();
> return ret;
> }
>
>
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