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Subject[PATCH 05/40] ide-scsi: merge idescsi_input_buffers() and idescsi_output_buffers()
* Merge idescsi_input_buffers() and idescsi_output_buffers()
into ide_scsi_io_buffers() helper.

While at it:

* Log device name instead of driver name on error.

* Use xfer_func_t.

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/scsi/ide-scsi.c | 81 ++++++++++++++----------------------------------
1 file changed, 24 insertions(+), 57 deletions(-)

Index: b/drivers/scsi/ide-scsi.c
===================================================================
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -129,51 +129,15 @@ static inline idescsi_scsi_t *drive_to_i
#define IDESCSI_PC_RQ 90

/*
- * PIO data transfer routines using the scatter gather table.
+ * PIO data transfer routine using the scatter gather table.
*/
-static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount)
+static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ unsigned int bcount, int write)
{
ide_hwif_t *hwif = drive->hwif;
- int count;
+ xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
char *buf;
-
- while (bcount) {
- count = min(pc->sg->length - pc->b_count, bcount);
- if (PageHighMem(sg_page(pc->sg))) {
- unsigned long flags;
-
- local_irq_save(flags);
- buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
- pc->sg->offset;
- hwif->input_data(drive, NULL, buf + pc->b_count, count);
- kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
- local_irq_restore(flags);
- } else {
- buf = sg_virt(pc->sg);
- hwif->input_data(drive, NULL, buf + pc->b_count, count);
- }
- bcount -= count; pc->b_count += count;
- if (pc->b_count == pc->sg->length) {
- if (!--pc->sg_cnt)
- break;
- pc->sg = sg_next(pc->sg);
- pc->b_count = 0;
- }
- }
-
- if (bcount) {
- printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
- ide_pad_transfer(drive, 0, bcount);
- }
-}
-
-static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount)
-{
- ide_hwif_t *hwif = drive->hwif;
int count;
- char *buf;

while (bcount) {
count = min(pc->sg->length - pc->b_count, bcount);
@@ -182,13 +146,13 @@ static void idescsi_output_buffers(ide_d

local_irq_save(flags);
buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
- pc->sg->offset;
- hwif->output_data(drive, NULL, buf + pc->b_count, count);
+ pc->sg->offset;
+ xf(drive, NULL, buf + pc->b_count, count);
kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
local_irq_restore(flags);
} else {
buf = sg_virt(pc->sg);
- hwif->output_data(drive, NULL, buf + pc->b_count, count);
+ xf(drive, NULL, buf + pc->b_count, count);
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
@@ -200,8 +164,10 @@ static void idescsi_output_buffers(ide_d
}

if (bcount) {
- printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
- ide_pad_transfer(drive, 1, bcount);
+ printk(KERN_ERR "%s: scatter gather table too small, %s\n",
+ drive->name, write ? "padding with zeros"
+ : "discarding data");
+ ide_pad_transfer(drive, write, bcount);
}
}

@@ -370,6 +336,7 @@ static ide_startstop_t idescsi_pc_intr (
ide_hwif_t *hwif = drive->hwif;
struct ide_atapi_pc *pc = scsi->pc;
struct request *rq = pc->rq;
+ xfer_func_t *xferfunc;
unsigned int temp;
u16 bcount;
u8 stat, ireason;
@@ -445,8 +412,8 @@ static ide_startstop_t idescsi_pc_intr (
temp = pc->buf_size - pc->xferred;
if (temp) {
if (pc->sg)
- idescsi_input_buffers(drive, pc,
- temp);
+ ide_scsi_io_buffers(drive, pc,
+ temp, 0);
else
hwif->input_data(drive, NULL,
pc->cur_pos, temp);
@@ -464,16 +431,16 @@ static ide_startstop_t idescsi_pc_intr (
printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
#endif /* IDESCSI_DEBUG_LOG */
}
- if (pc->sg)
- idescsi_input_buffers(drive, pc, bcount);
- else
- hwif->input_data(drive, NULL, pc->cur_pos, bcount);
- } else {
- if (pc->sg)
- idescsi_output_buffers(drive, pc, bcount);
- else
- hwif->output_data(drive, NULL, pc->cur_pos, bcount);
- }
+ xferfunc = hwif->input_data;
+ } else
+ xferfunc = hwif->output_data;
+
+ if (pc->sg)
+ ide_scsi_io_buffers(drive, pc, bcount,
+ !!(pc->flags & PC_FLAG_WRITING));
+ else
+ xferfunc(drive, NULL, pc->cur_pos, bcount);
+
/* Update the current position */
pc->xferred += bcount;
pc->cur_pos += bcount;

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