ide: destroy DMA mappings after ending DMA (v2)

Move ide_destroy_dmatable() call out from ->dma_end method to
{ide_pc,cdrom_newpc,ide_dma}_intr(), ide_dma_timeout_retry()
and sgiioc4_resetproc().

This causes minor/safe behavior changes w.r.t.:
* cmd64x.c::cmd64{8,x}_dma_end()
* cs5536.c::cs5536_dma_end()
* icside.c::icside_dma_end()
* it821x.c::it821x_dma_end()
* scc_pata.c::__scc_dma_end()
* sl82c105.c::sl82c105_dma_end()
* tx4939ide.c::tx4939ide_dma_end()

v2:
* Fix build for CONFIG_BLK_DEV_IDEDMA=n (reported by Randy Dunlap).

Cc: Randy Dunlap <randy.dunlap@oracle.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

15 files changed, 13 insertions, 24 deletions

diff --git a/drivers/ide/au1xxx-ide.c b/drivers/ide/au1xxx-ide.c
index 0c08c5e01f2a..ba2a211758a9 100644
--- a/drivers/ide/au1xxx-ide.c
+++ b/drivers/ide/au1xxx-ide.c
@@ -280,8 +280,6 @@ static int auide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
 
 static int auide_dma_end(ide_drive_t *drive)
 {
-        ide_destroy_dmatable(drive);
-
         return 0;
 }
 
diff --git a/drivers/ide/cmd64x.c b/drivers/ide/cmd64x.c
index f0a49d2ff711..f2edf280ef8b 100644
--- a/drivers/ide/cmd64x.c
+++ b/drivers/ide/cmd64x.c
@@ -327,8 +327,6 @@ static int cmd646_1_dma_end(ide_drive_t *drive)
         outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
         /* clear the INTR & ERROR bits */
         outb(dma_stat | 6, hwif->dma_base + ATA_DMA_STATUS);
-        /* and free any DMA resources */
-        ide_destroy_dmatable(drive);
         /* verify good DMA status */
         return (dma_stat & 7) != 4;
 }
diff --git a/drivers/ide/icside.c b/drivers/ide/icside.c
index f069f122ee6e..9bf57d7c8e57 100644
--- a/drivers/ide/icside.c
+++ b/drivers/ide/icside.c
@@ -291,9 +291,6 @@ static int icside_dma_end(ide_drive_t *drive)
 
         disable_dma(ec->dma);
 
-        /* Teardown mappings after DMA has completed. */
-        ide_destroy_dmatable(drive);
-
         return get_dma_residue(ec->dma) != 0;
 }
 
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index f591166d2c93..1481f71f8173 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -342,8 +342,11 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
         stat = tp_ops->read_status(hwif);
 
         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
-                if (hwif->dma_ops->dma_end(drive) ||
-                    (drive->media == ide_tape && (stat & ATA_ERR))) {
+                int rc = hwif->dma_ops->dma_end(drive);
+
+                ide_destroy_dmatable(drive);
+
+                if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
                         if (drive->media == ide_floppy)
                                 printk(KERN_ERR "%s: DMA %s error\n",
                                         drive->name, rq_data_dir(pc->rq)
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 5319e7a73708..4a0d66ee9547 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -639,6 +639,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
         if (dma) {
                 drive->dma = 0;
                 dma_error = hwif->dma_ops->dma_end(drive);
+                ide_destroy_dmatable(drive);
                 if (dma_error) {
                         printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
                                         write ? "write" : "read");
diff --git a/drivers/ide/ide-dma-sff.c b/drivers/ide/ide-dma-sff.c
index 7836d7e03fff..f8adbb5eb339 100644
--- a/drivers/ide/ide-dma-sff.c
+++ b/drivers/ide/ide-dma-sff.c
@@ -310,8 +310,6 @@ int ide_dma_end(ide_drive_t *drive)
         /* clear INTR & ERROR bits */
         ide_dma_sff_write_status(hwif, dma_stat | ATA_DMA_ERR | ATA_DMA_INTR);
 
-        /* purge DMA mappings */
-        ide_destroy_dmatable(drive);
         wmb();
 
         /* verify good DMA status */
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 4e2005071113..b430898bbcd6 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -92,6 +92,7 @@ ide_startstop_t ide_dma_intr(ide_drive_t *drive)
         u8 stat = 0, dma_stat = 0;
 
         dma_stat = hwif->dma_ops->dma_end(drive);
+        ide_destroy_dmatable(drive);
         stat = hwif->tp_ops->read_status(hwif);
 
         if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) {
@@ -479,6 +480,7 @@ ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
         if (error < 0) {
                 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
                 (void)dma_ops->dma_end(drive);
+                ide_destroy_dmatable(drive);
                 ret = ide_error(drive, "dma timeout error",
                                 hwif->tp_ops->read_status(hwif));
         } else {
@@ -490,6 +492,7 @@ ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
                         ide_dump_status(drive, "DMA timeout",
                                         hwif->tp_ops->read_status(hwif));
                         (void)dma_ops->dma_end(drive);
+                        ide_destroy_dmatable(drive);
                 }
         }
 
diff --git a/drivers/ide/ns87415.c b/drivers/ide/ns87415.c
index 9039a373020f..9ad71a74f93f 100644
--- a/drivers/ide/ns87415.c
+++ b/drivers/ide/ns87415.c
@@ -210,8 +210,6 @@ static int ns87415_dma_end(ide_drive_t *drive)
         /* from ERRATA: clear the INTR & ERROR bits */
         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
         outb(dma_cmd | 6, hwif->dma_base + ATA_DMA_CMD);
-        /* and free any DMA resources */
-        ide_destroy_dmatable(drive);
         /* verify good DMA status */
         return (dma_stat & 7) != 4;
 }
diff --git a/drivers/ide/pmac.c b/drivers/ide/pmac.c
index d15cc46a66e3..5643a8b957bf 100644
--- a/drivers/ide/pmac.c
+++ b/drivers/ide/pmac.c
@@ -1562,8 +1562,6 @@ pmac_ide_dma_end (ide_drive_t *drive)
         dstat = readl(&dma->status);
         writel(((RUN|WAKE|DEAD) << 16), &dma->control);
 
-        ide_destroy_dmatable(drive);
-
         /* verify good dma status. we don't check for ACTIVE beeing 0. We should...
          * in theory, but with ATAPI decices doing buffer underruns, that would
          * cause us to disable DMA, which isn't what we want
diff --git a/drivers/ide/sc1200.c b/drivers/ide/sc1200.c
index 371549d18a01..d9c47034bedd 100644
--- a/drivers/ide/sc1200.c
+++ b/drivers/ide/sc1200.c
@@ -184,7 +184,6 @@ static int sc1200_dma_end(ide_drive_t *drive)
         outb(inb(dma_base)&~1, dma_base);       /* !! DO THIS HERE !! stop DMA */
 
         drive->waiting_for_dma = 0;
-        ide_destroy_dmatable(drive);            /* purge DMA mappings */
 
         return (dma_stat & 7) != 4;             /* verify good DMA status */
 }
diff --git a/drivers/ide/scc_pata.c b/drivers/ide/scc_pata.c
index 64534d150b0c..693536ebe331 100644
--- a/drivers/ide/scc_pata.c
+++ b/drivers/ide/scc_pata.c
@@ -365,8 +365,6 @@ static int __scc_dma_end(ide_drive_t *drive)
         dma_stat = scc_dma_sff_read_status(hwif);
         /* clear the INTR & ERROR bits */
         scc_ide_outb(dma_stat | 6, hwif->dma_base + 4);
-        /* purge DMA mappings */
-        ide_destroy_dmatable(drive);
         /* verify good DMA status */
         wmb();
         return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
diff --git a/drivers/ide/sgiioc4.c b/drivers/ide/sgiioc4.c
index 44df0c750bab..457a762a1f29 100644
--- a/drivers/ide/sgiioc4.c
+++ b/drivers/ide/sgiioc4.c
@@ -259,7 +259,6 @@ static int sgiioc4_dma_end(ide_drive_t *drive)
         }
 
         drive->waiting_for_dma = 0;
-        ide_destroy_dmatable(drive);
 
         return dma_stat;
 }
@@ -284,6 +283,7 @@ static void
 sgiioc4_resetproc(ide_drive_t * drive)
 {
         sgiioc4_dma_end(drive);
+        ide_destroy_dmatable(drive);
         sgiioc4_clearirq(drive);
 }
 
diff --git a/drivers/ide/trm290.c b/drivers/ide/trm290.c
index d6a950828e9f..8dd3d8226870 100644
--- a/drivers/ide/trm290.c
+++ b/drivers/ide/trm290.c
@@ -216,8 +216,7 @@ static int trm290_dma_end(ide_drive_t *drive)
         u16 status;
 
         drive->waiting_for_dma = 0;
-        /* purge DMA mappings */
-        ide_destroy_dmatable(drive);
+
         status = inw(drive->hwif->dma_base + 2);
 
         return status != 0x00ff;
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index 53f99853b065..f62ced855cf3 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -335,11 +335,9 @@ static int tx4939ide_dma_end(ide_drive_t *drive)
         /* read and clear the INTR & ERROR bits */
         dma_stat = tx4939ide_clear_dma_status(base);
 
-        /* purge DMA mappings */
-        ide_destroy_dmatable(drive);
-        /* verify good DMA status */
         wmb();
 
+        /* verify good DMA status */
         if ((dma_stat & (ATA_DMA_INTR | ATA_DMA_ERR | ATA_DMA_ACTIVE)) == 0 &&
             (ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST)) ==
             (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST))
diff --git a/include/linux/ide.h b/include/linux/ide.h
index d3035f2f1250..b6c4942fde11 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1479,6 +1479,7 @@ static inline ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int erro
 static inline void ide_release_dma_engine(ide_hwif_t *hwif) { ; }
 static inline int ide_build_sglist(ide_drive_t *drive,
                                    struct ide_cmd *cmd) { return 0; }
+static inline void ide_destroy_dmatable(ide_drive_t *drive) { ; }
 #endif /* CONFIG_BLK_DEV_IDEDMA */
 
 #ifdef CONFIG_BLK_DEV_IDEACPI