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>

diff --git a/drivers/ide/au1xxx-ide.c b/drivers/ide/au1xxx-ide.c
index 0c08c5e..ba2a211 100644 (file)
--- 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 f0a49d2..f2edf28 100644 (file)
--- 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 f069f12..9bf57d7 100644 (file)
--- 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 f591166..1481f71 100644 (file)
--- 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 5319e7a..4a0d66e 100644 (file)
--- 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 7836d7e..f8adbb5 100644 (file)
--- 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 4e20050..b430898 100644 (file)
--- 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 9039a37..9ad71a7 100644 (file)
--- 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 d15cc46..5643a8b 100644 (file)
--- 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 371549d..d9c4703 100644 (file)
--- 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 64534d1..693536e 100644 (file)
--- 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 44df0c7..457a762 100644 (file)
--- 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 d6a9508..8dd3d82 100644 (file)
--- 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 53f9985..f62ced8 100644 (file)
--- 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 d3035f2..b6c4942 100644 (file)
--- 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