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alistair23-linux
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jsflash: stop sharing request queue across multiple gendisks 

Compile-tested only (by hacking it to compile on x86).

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Omar Sandoval 2017-03-27 23:28:47 -07:00 committed by Jens Axboe
parent 103db8b2df
commit 8b0c441e15
1 changed files with 36 additions and 14 deletions
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50
drivers/sbus/char/jsflash.c
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@ -183,11 +183,33 @@ static void jsfd_read(char *buf, unsigned long p, size_t togo) {
}
}
static void jsfd_do_request(struct request_queue *q)
static int jsfd_queue;
static struct request *jsfd_next_request(void)
{
struct request_queue *q;
struct request *rq;
int old_pos = jsfd_queue;
do {
q = jsfd_disk[jsfd_queue]->queue;
if (++jsfd_queue == JSF_MAX)
jsfd_queue = 0;
if (q) {
rq = blk_fetch_request(q);
if (rq)
return rq;
}
} while (jsfd_queue != old_pos);
return NULL;
}
static void jsfd_request(void)
{
struct request *req;
req = blk_fetch_request(q);
req = jsfd_next_request();
while (req) {
struct jsfd_part *jdp = req->rq_disk->private_data;
unsigned long offset = blk_rq_pos(req) << 9;
@ -211,10 +233,15 @@ static void jsfd_do_request(struct request_queue *q)
err = 0;
end:
if (!__blk_end_request_cur(req, err))
req = blk_fetch_request(q);
req = jsfd_next_request();
}
}
static void jsfd_do_request(struct request_queue *q)
{
jsfd_request();
}
/*
* The memory devices use the full 32/64 bits of the offset, and so we cannot
* check against negative addresses: they are ok. The return value is weird,
@ -544,8 +571,6 @@ static int jsflash_init(void)
return 0;
}
static struct request_queue *jsf_queue;
static int jsfd_init(void)
{
static DEFINE_SPINLOCK(lock);
@ -562,6 +587,11 @@ static int jsfd_init(void)
struct gendisk *disk = alloc_disk(1);
if (!disk)
goto out;
disk->queue = blk_init_queue(jsfd_do_request, &lock);
if (!disk->queue) {
put_disk(disk);
goto out;
}
jsfd_disk[i] = disk;
}
@ -570,13 +600,6 @@ static int jsfd_init(void)
goto out;
}
jsf_queue = blk_init_queue(jsfd_do_request, &lock);
if (!jsf_queue) {
err = -ENOMEM;
unregister_blkdev(JSFD_MAJOR, "jsfd");
goto out;
}
for (i = 0; i < JSF_MAX; i++) {
struct gendisk *disk = jsfd_disk[i];
if ((i & JSF_PART_MASK) >= JSF_NPART) continue;
@ -589,7 +612,6 @@ static int jsfd_init(void)
disk->fops = &jsfd_fops;
set_capacity(disk, jdp->dsize >> 9);
disk->private_data = jdp;
disk->queue = jsf_queue;
add_disk(disk);
set_disk_ro(disk, 1);
}
@ -619,6 +641,7 @@ static void __exit jsflash_cleanup_module(void)
for (i = 0; i < JSF_MAX; i++) {
if ((i & JSF_PART_MASK) >= JSF_NPART) continue;
del_gendisk(jsfd_disk[i]);
blk_cleanup_queue(jsfd_disk[i]->queue);
put_disk(jsfd_disk[i]);
}
if (jsf0.busy)
@ -628,7 +651,6 @@ static void __exit jsflash_cleanup_module(void)
misc_deregister(&jsf_dev);
unregister_blkdev(JSFD_MAJOR, "jsfd");
blk_cleanup_queue(jsf_queue);
}
module_init(jsflash_init_module);