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Subject[PATCH 02/15] ide-atapi: switch to blk_rq_bytes() on do_request() path
Date
After the recent struct request cleanups, blk_rq_bytes() is guaranteed
to be valid and is the current total length of the rq's bio. Use that
instead of pc->req_xfer in the do_request() path after the command has
been queued

The remaining usage of pc->req_xfer now is only until we map the rq to a
bio.

While at it:

- remove local caching of rq completion length in ide_tape_issue_pc()

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
---
drivers/ide/ide-atapi.c | 12 +++++++-----
drivers/ide/ide-floppy.c | 8 ++++----
drivers/ide/ide-tape.c | 14 +++++++-------
3 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 8a894fa..7129495 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -370,7 +370,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
? "write" : "read");
pc->flags |= PC_FLAG_DMA_ERROR;
} else
- pc->xferred = pc->req_xfer;
+ pc->xferred = blk_rq_bytes(rq);
debug_log("%s: DMA finished\n", drive->name);
}

@@ -627,7 +627,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
ide_hwif_t *hwif = drive->hwif;
ide_expiry_t *expiry = NULL;
struct request *rq = hwif->rq;
- unsigned int timeout;
+ unsigned int timeout, bytes;
u16 bcount;
u8 valid_tf;
u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
@@ -647,9 +647,11 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
pc->xferred = 0;

valid_tf = IDE_VALID_DEVICE;
- bcount = ((drive->media == ide_tape) ?
- pc->req_xfer :
- min(pc->req_xfer, 63 * 1024));
+ bytes = blk_rq_bytes(rq);
+
+ bcount = ((drive->media == ide_tape) ? bytes
+ : min_t(unsigned int,
+ bytes, 63 * 1024));

if (pc->flags & PC_FLAG_DMA_ERROR) {
pc->flags &= ~PC_FLAG_DMA_ERROR;
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 6509817..a1c5598 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -210,7 +210,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
if (rq->cmd_flags & REQ_RW)
pc->flags |= PC_FLAG_WRITING;
pc->buf = NULL;
- pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
+ pc->buf_size = blk_rq_bytes(rq);
pc->flags |= PC_FLAG_DMA_OK;
}

@@ -227,7 +227,7 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
}
/* pio will be performed by ide_pio_bytes() which handles sg fine */
pc->buf = NULL;
- pc->req_xfer = pc->buf_size = blk_rq_bytes(rq);
+ pc->buf_size = blk_rq_bytes(rq);
}

static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
@@ -286,8 +286,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,

cmd.rq = rq;

- if (blk_fs_request(rq) || pc->req_xfer) {
- ide_init_sg_cmd(&cmd, pc->req_xfer);
+ if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
+ ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
ide_map_sg(drive, &cmd);
}

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index fc79cf4..aaeef12 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -292,6 +292,7 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc *pc = drive->failed_pc;
+ struct request *rq = drive->hwif->rq;

tape->sense_key = sense[2] & 0xF;
tape->asc = sense[12];
@@ -302,7 +303,7 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)

/* Correct pc->xferred by asking the tape. */
if (pc->flags & PC_FLAG_DMA_ERROR)
- pc->xferred = pc->req_xfer -
+ pc->xferred = blk_rq_bytes(rq) -
tape->blk_size *
get_unaligned_be32(&sense[3]);

@@ -484,6 +485,7 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
idetape_tape_t *tape = drive->driver_data;
+ struct request *rq = drive->hwif->rq;

if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
drive->failed_pc = pc;
@@ -493,7 +495,6 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,

if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
(pc->flags & PC_FLAG_ABORT)) {
- unsigned int done = blk_rq_bytes(drive->hwif->rq);

/*
* We will "abort" retrying a packet command in case legitimate
@@ -517,7 +518,7 @@ static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive,

drive->failed_pc = NULL;
drive->pc_callback(drive, 0);
- ide_complete_rq(drive, -EIO, done);
+ ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
return ide_stopped;
}
debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
@@ -592,9 +593,8 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
pc->c[1] = 1;
pc->buf = NULL;
- pc->buf_size = length * tape->blk_size;
- pc->req_xfer = pc->buf_size;
- if (pc->req_xfer == tape->buffer_size)
+ pc->buf_size = blk_rq_bytes(rq);
+ if (pc->buf_size == tape->buffer_size)
pc->flags |= PC_FLAG_DMA_OK;

if (opcode == READ_6)
@@ -718,7 +718,7 @@ out:

cmd.rq = rq;

- ide_init_sg_cmd(&cmd, pc->req_xfer);
+ ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
ide_map_sg(drive, &cmd);

return ide_tape_issue_pc(drive, &cmd, pc);
--
1.6.3


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