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parport/pf: stop sharing request queue across multiple gendisks 

Compile-tested only.

Cc: Tim Waugh <tim@cyberelk.net>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-03-27 23:28:45 -07:00 committed by Jens Axboe
parent 547b50a1fb
commit 3a644142e8
1 changed files with 38 additions and 19 deletions
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57
drivers/block/paride/pf.c
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@ -287,6 +287,12 @@ static void __init pf_init_units(void)
struct gendisk *disk = alloc_disk(1);
if (!disk)
continue;
disk->queue = blk_init_queue(do_pf_request, &pf_spin_lock);
if (!disk->queue) {
put_disk(disk);
return;
}
blk_queue_max_segments(disk->queue, cluster);
pf->disk = disk;
pf->pi = &pf->pia;
pf->media_status = PF_NM;
@ -772,7 +778,28 @@ static int pf_ready(void)
return (((status_reg(pf_current) & (STAT_BUSY | pf_mask)) == pf_mask));
}
static struct request_queue *pf_queue;
static int pf_queue;
static int set_next_request(void)
{
struct pf_unit *pf;
struct request_queue *q;
int old_pos = pf_queue;
do {
pf = &units[pf_queue];
q = pf->present ? pf->disk->queue : NULL;
if (++pf_queue == PF_UNITS)
pf_queue = 0;
if (q) {
pf_req = blk_fetch_request(q);
if (pf_req)
break;
}
} while (pf_queue != old_pos);
return pf_req != NULL;
}
static void pf_end_request(int err)
{
@ -780,16 +807,13 @@ static void pf_end_request(int err)
pf_req = NULL;
}
static void do_pf_request(struct request_queue * q)
static void pf_request(void)
{
if (pf_busy)
return;
repeat:
if (!pf_req) {
pf_req = blk_fetch_request(q);
if (!pf_req)
return;
}
if (!pf_req && !set_next_request())
return;
pf_current = pf_req->rq_disk->private_data;
pf_block = blk_rq_pos(pf_req);
@ -817,6 +841,11 @@ repeat:
}
}
static void do_pf_request(struct request_queue *q)
{
pf_request();
}
static int pf_next_buf(void)
{
unsigned long saved_flags;
@ -846,7 +875,7 @@ static inline void next_request(int err)
spin_lock_irqsave(&pf_spin_lock, saved_flags);
pf_end_request(err);
pf_busy = 0;
do_pf_request(pf_queue);
pf_request();
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
}
@ -972,15 +1001,6 @@ static int __init pf_init(void)
put_disk(pf->disk);
return -EBUSY;
}
pf_queue = blk_init_queue(do_pf_request, &pf_spin_lock);
if (!pf_queue) {
unregister_blkdev(major, name);
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
put_disk(pf->disk);
return -ENOMEM;
}
blk_queue_max_segments(pf_queue, cluster);
for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
struct gendisk *disk = pf->disk;
@ -988,7 +1008,6 @@ static int __init pf_init(void)
if (!pf->present)
continue;
disk->private_data = pf;
disk->queue = pf_queue;
add_disk(disk);
}
return 0;
@ -1003,10 +1022,10 @@ static void __exit pf_exit(void)
if (!pf->present)
continue;
del_gendisk(pf->disk);
blk_cleanup_queue(pf->disk->queue);
put_disk(pf->disk);
pi_release(pf->pi);
}
blk_cleanup_queue(pf_queue);
}
MODULE_LICENSE("GPL");