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swim3: clean up request completion paths

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swim3 curiously tries to update request parameters before calling
__blk_end_request() when __blk_end_request() will do it anyway, and it
updates request for partial completion manually instead of using
blk_update_request().  Also, it does some spurious checks on rq such
as testing whether rq->sector is negative or current_nr_sectors is
zero right after fetching.

Drop unnecessary stuff and use standard block layer mechanisms.

[ Impact: cleanup ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo 2009-04-28 13:06:12 +09:00 committed by Jens Axboe
parent e091eb67af
commit 467ca759fc
1 changed files with 5 additions and 26 deletions
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31
drivers/block/swim3.c
View file

@ -319,14 +319,10 @@ static void start_request(struct floppy_state *fs)
req->errors, req->current_nr_sectors);
#endif
if (req->sector < 0 || req->sector >= fs->total_secs) {
if (req->sector >= fs->total_secs) {
__blk_end_request_cur(req, -EIO);
continue;
}
if (req->current_nr_sectors == 0) {
__blk_end_request_cur(req, 0);
continue;
}
if (fs->ejected) {
__blk_end_request_cur(req, -EIO);
continue;
@ -593,8 +589,6 @@ static void xfer_timeout(unsigned long data)
struct floppy_state *fs = (struct floppy_state *) data;
struct swim3 __iomem *sw = fs->swim3;
struct dbdma_regs __iomem *dr = fs->dma;
struct dbdma_cmd *cp = fs->dma_cmd;
unsigned long s;
int n;
fs->timeout_pending = 0;
@ -605,14 +599,6 @@ static void xfer_timeout(unsigned long data)
out_8(&sw->intr_enable, 0);
out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
out_8(&sw->select, RELAX);
if (rq_data_dir(fd_req) == WRITE)
++cp;
if (ld_le16(&cp->xfer_status) != 0)
s = fs->scount - ((ld_le16(&cp->res_count) + 511) >> 9);
else
s = 0;
fd_req->sector += s;
fd_req->current_nr_sectors -= s;
printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
(rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
__blk_end_request_cur(fd_req, -EIO);
@ -719,9 +705,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
if (intr & ERROR_INTR) {
n = fs->scount - 1 - resid / 512;
if (n > 0) {
fd_req->sector += n;
fd_req->current_nr_sectors -= n;
fd_req->buffer += n * 512;
blk_update_request(fd_req, 0, n << 9);
fs->req_sector += n;
}
if (fs->retries < 5) {
@ -745,13 +729,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
start_request(fs);
break;
}
fd_req->sector += fs->scount;
fd_req->current_nr_sectors -= fs->scount;
fd_req->buffer += fs->scount * 512;
if (fd_req->current_nr_sectors <= 0) {
__blk_end_request_cur(fd_req, 0);
fs->state = idle;
} else {
if (__blk_end_request(fd_req, 0, fs->scount << 9)) {
fs->req_sector += fs->scount;
if (fs->req_sector > fs->secpertrack) {
fs->req_sector -= fs->secpertrack;
@ -761,7 +739,8 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
}
}
act(fs);
}
} else
fs->state = idle;
}
if (fs->state == idle)
start_request(fs);