ide: add ide_io_buffers() helper

* Make ->io_buffers method return number of bytes transferred.

* Use ide_end_request() instead of idefloppy_end_request()
  in ide_floppy_io_buffers() and then move the call out to
  ide_pc_intr().

* Add ide_io_buffers() helper and convert ide-{floppy,scsi}.c
  to use it instead of ide*_io_buffers().

There should be no functional changes caused by this patch.

Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 61c52fb..3d44b45 100644 (file)
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -61,12 +61,62 @@ int ide_check_atapi_device(ide_drive_t *drive, const char *s)
 }
 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
 
+/* PIO data transfer routine using the scatter gather table. */
+int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
+                   unsigned int bcount, int write)
+{
+       ide_hwif_t *hwif = drive->hwif;
+       const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+       xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
+       struct scatterlist *sg = pc->sg;
+       char *buf;
+       int count, done = 0;
+
+       while (bcount) {
+               count = min(sg->length - pc->b_count, bcount);
+
+               if (PageHighMem(sg_page(sg))) {
+                       unsigned long flags;
+
+                       local_irq_save(flags);
+                       buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
+                       xf(drive, NULL, buf + pc->b_count, count);
+                       kunmap_atomic(buf - sg->offset, KM_IRQ0);
+                       local_irq_restore(flags);
+               } else {
+                       buf = sg_virt(sg);
+                       xf(drive, NULL, buf + pc->b_count, count);
+               }
+
+               bcount -= count;
+               pc->b_count += count;
+               done += count;
+
+               if (pc->b_count == sg->length) {
+                       if (!--pc->sg_cnt)
+                               break;
+                       pc->sg = sg = sg_next(sg);
+                       pc->b_count = 0;
+               }
+       }
+
+       if (bcount) {
+               printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
+                       bcount, write ? "padding with zeros"
+                                     : "discarding data");
+               ide_pad_transfer(drive, write, bcount);
+       }
+
+       return done;
+}
+EXPORT_SYMBOL_GPL(ide_io_buffers);
+
 /* TODO: unify the code thus making some arguments go away */
 ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
        ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
        void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
        void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
-       void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
+       int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
 {
        ide_hwif_t *hwif = drive->hwif;
        struct request *rq = hwif->hwgroup->rq;
@@ -219,9 +269,14 @@ cmd_finished:
 
        if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
            (drive->media == ide_tape && !scsi && pc->bh) ||
-           (scsi && pc->sg))
-               io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
-       else
+           (scsi && pc->sg)) {
+               int done = io_buffers(drive, pc, bcount,
+                                 !!(pc->flags & PC_FLAG_WRITING));
+
+               /* FIXME: don't do partial completions */
+               if (drive->media == ide_floppy && !scsi)
+                       ide_end_request(drive, 1, done >> 9);
+       } else
                xferfunc(drive, NULL, pc->cur_pos, bcount);
 
        /* Update the current position */

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index a0a8ad3..38dca45 100644 (file)
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -208,51 +208,6 @@ static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
        return 0;
 }
 
-static void ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
-                                 unsigned int bcount, int direction)
-{
-       ide_hwif_t *hwif = drive->hwif;
-       const struct ide_tp_ops *tp_ops = hwif->tp_ops;
-       xfer_func_t *xf = direction ? tp_ops->output_data : tp_ops->input_data;
-       struct scatterlist *sg = pc->sg;
-       char *buf;
-       int count, done = 0;
-
-       while (bcount) {
-               count = min(sg->length - pc->b_count, bcount);
-               if (PageHighMem(sg_page(sg))) {
-                       unsigned long flags;
-
-                       local_irq_save(flags);
-                       buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
-                       xf(drive, NULL, buf + pc->b_count, count);
-                       kunmap_atomic(buf - sg->offset, KM_IRQ0);
-                       local_irq_restore(flags);
-               } else {
-                       buf = sg_virt(sg);
-                       xf(drive, NULL, buf + pc->b_count, count);
-               }
-               bcount -= count;
-               pc->b_count += count;
-               done += count;
-
-               if (pc->b_count == sg->length) {
-                       if (!--pc->sg_cnt)
-                               break;
-                       pc->sg = sg = sg_next(sg);
-                       pc->b_count = 0;
-               }
-       }
-
-       idefloppy_end_request(drive, 1, done >> 9);
-
-       if (bcount) {
-               printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",
-                               drive->name, __func__, bcount);
-               ide_pad_transfer(drive, direction, bcount);
-       }
-}
-
 static void idefloppy_update_buffers(ide_drive_t *drive,
                                struct ide_atapi_pc *pc)
 {
@@ -356,7 +311,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
 
        return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
                           IDEFLOPPY_WAIT_CMD, NULL, idefloppy_update_buffers,
-                          idefloppy_retry_pc, NULL, ide_floppy_io_buffers);
+                          idefloppy_retry_pc, NULL, ide_io_buffers);
 }
 
 /*

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index ba05e03..d4a9c47 100644 (file)
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -693,13 +693,15 @@ static void ide_tape_handle_dsc(ide_drive_t *drive)
        idetape_postpone_request(drive);
 }
 
-static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
+static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
                                unsigned int bcount, int write)
 {
        if (write)
                idetape_output_buffers(drive, pc, bcount);
        else
                idetape_input_buffers(drive, pc, bcount);
+
+       return bcount;
 }
 
 /*

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 26e8c3c..27c01e3 100644 (file)
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -130,50 +130,6 @@ static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
        return scsihost_to_idescsi(ide_drive->driver_data);
 }
 
-/*
- *     PIO data transfer routine using the scatter gather table.
- */
-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;
-       const struct ide_tp_ops *tp_ops = hwif->tp_ops;
-       xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
-       struct scatterlist *sg = pc->sg;
-       char *buf;
-       int count;
-
-       while (bcount) {
-               count = min(sg->length - pc->b_count, bcount);
-               if (PageHighMem(sg_page(sg))) {
-                       unsigned long flags;
-
-                       local_irq_save(flags);
-                       buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
-                       xf(drive, NULL, buf + pc->b_count, count);
-                       kunmap_atomic(buf - sg->offset, KM_IRQ0);
-                       local_irq_restore(flags);
-               } else {
-                       buf = sg_virt(sg);
-                       xf(drive, NULL, buf + pc->b_count, count);
-               }
-               bcount -= count; pc->b_count += count;
-               if (pc->b_count == sg->length) {
-                       if (!--pc->sg_cnt)
-                               break;
-                       pc->sg = sg = sg_next(sg);
-                       pc->b_count = 0;
-               }
-       }
-
-       if (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);
-       }
-}
-
 static void ide_scsi_hex_dump(u8 *data, int len)
 {
        print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
@@ -343,7 +299,7 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 
        return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
                           idescsi_expiry, NULL, NULL, NULL,
-                          ide_scsi_io_buffers);
+                          ide_io_buffers);
 }
 
 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)

diff --git a/include/linux/ide.h b/include/linux/ide.h
index e63ff63..03dc215 100644 (file)
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1099,6 +1099,8 @@ void ide_tf_read(ide_drive_t *, ide_task_t *);
 void ide_input_data(ide_drive_t *, struct request *, void *, unsigned int);
 void ide_output_data(ide_drive_t *, struct request *, void *, unsigned int);
 
+int ide_io_buffers(ide_drive_t *, struct ide_atapi_pc *, unsigned int, int);
+
 extern void SELECT_DRIVE(ide_drive_t *);
 void SELECT_MASK(ide_drive_t *, int);
 
@@ -1115,7 +1117,7 @@ ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
        ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
        void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
        void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
-       void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,
+       int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,
                           int));
 ide_startstop_t ide_transfer_pc(ide_drive_t *, struct ide_atapi_pc *,
                                ide_handler_t *, unsigned int, ide_expiry_t *);