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Subject[PATCH 06/18] swim3: dequeue in-flight request
Date
swim3 has at most single request in flight and already tracks it using
fd_req. Convert it to dequeuing model by updating request fetching
and wrapping completion function.

[ Impact: dequeue in-flight request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
---
drivers/block/swim3.c | 47 ++++++++++++++++++++++++++++++++++-------------
1 files changed, 34 insertions(+), 13 deletions(-)
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index c1b9a4d..f48c6dd 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -251,6 +251,20 @@ static int floppy_release(struct gendisk *disk, fmode_t mode);
static int floppy_check_change(struct gendisk *disk);
static int floppy_revalidate(struct gendisk *disk);

+static bool swim3_end_request(int err, unsigned int nr_bytes)
+{
+ if (__blk_end_request(fd_req, err, nr_bytes))
+ return true;
+
+ fd_req = NULL;
+ return false;
+}
+
+static bool swim3_end_request_cur(int err)
+{
+ return swim3_end_request(err, blk_rq_cur_bytes(fd_req));
+}
+
static void swim3_select(struct floppy_state *fs, int sel)
{
struct swim3 __iomem *sw = fs->swim3;
@@ -310,7 +324,14 @@ static void start_request(struct floppy_state *fs)
wake_up(&fs->wait);
return;
}
- while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
+ while (fs->state == idle) {
+ if (!fd_req) {
+ fd_req = elv_next_request(swim3_queue);
+ if (!fd_req)
+ break;
+ blkdev_dequeue_request(fd_req);
+ }
+ req = fd_req;
#if 0
printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
req->rq_disk->disk_name, req->cmd,
@@ -320,11 +341,11 @@ static void start_request(struct floppy_state *fs)
#endif

if (blk_rq_pos(req) >= fs->total_secs) {
- __blk_end_request_cur(req, -EIO);
+ swim3_end_request_cur(-EIO);
continue;
}
if (fs->ejected) {
- __blk_end_request_cur(req, -EIO);
+ swim3_end_request_cur(-EIO);
continue;
}

@@ -332,7 +353,7 @@ static void start_request(struct floppy_state *fs)
if (fs->write_prot < 0)
fs->write_prot = swim3_readbit(fs, WRITE_PROT);
if (fs->write_prot) {
- __blk_end_request_cur(req, -EIO);
+ swim3_end_request_cur(-EIO);
continue;
}
}
@@ -505,7 +526,7 @@ static void act(struct floppy_state *fs)
case do_transfer:
if (fs->cur_cyl != fs->req_cyl) {
if (fs->retries > 5) {
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
return;
}
@@ -537,7 +558,7 @@ static void scan_timeout(unsigned long data)
out_8(&sw->intr_enable, 0);
fs->cur_cyl = -1;
if (fs->retries > 5) {
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
start_request(fs);
} else {
@@ -556,7 +577,7 @@ static void seek_timeout(unsigned long data)
out_8(&sw->select, RELAX);
out_8(&sw->intr_enable, 0);
printk(KERN_ERR "swim3: seek timeout\n");
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
start_request(fs);
}
@@ -580,7 +601,7 @@ static void settle_timeout(unsigned long data)
return;
}
printk(KERN_ERR "swim3: seek settle timeout\n");
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
start_request(fs);
}
@@ -603,7 +624,7 @@ static void xfer_timeout(unsigned long data)
printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
(rq_data_dir(fd_req)==WRITE? "writ": "read"),
(long)blk_rq_pos(fd_req));
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
start_request(fs);
}
@@ -634,7 +655,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");
fs->cur_cyl = -1;
if (fs->retries > 5) {
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
start_request(fs);
} else {
@@ -717,7 +738,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
printk("swim3: error %sing block %ld (err=%x)\n",
rq_data_dir(fd_req) == WRITE? "writ": "read",
(long)blk_rq_pos(fd_req), err);
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
}
} else {
@@ -726,12 +747,12 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);
printk(KERN_ERR " state=%d, dir=%x, intr=%x, err=%x\n",
fs->state, rq_data_dir(fd_req), intr, err);
- __blk_end_request_cur(fd_req, -EIO);
+ swim3_end_request_cur(-EIO);
fs->state = idle;
start_request(fs);
break;
}
- if (__blk_end_request(fd_req, 0, fs->scount << 9)) {
+ if (swim3_end_request(0, fs->scount << 9)) {
fs->req_sector += fs->scount;
if (fs->req_sector > fs->secpertrack) {
fs->req_sector -= fs->secpertrack;
--
1.6.0.2


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