ide: filter out "default" transfer mode values in set_xfer_rate()

* Filter out "default" transfer mode values (0x00 - default PIO mode,
  0x01 - default PIO mode w/ IORDY disabled) in write handler for obsoleted
  /proc/ide/hd?/settings:current_speed setting.

  Allowing "default" transfer mode values is a dangerous thing to do as
  we don't support programming controller to the "default" transfer mode
  and devices often use different values for the default and maximum PIO
  mode (i.e. PIO2 default and PIO4 maximum) so the controller will stay
  programmed for higher PIO mode while device will use the lower PIO mode.

  There is no functionality loss as by using special IOCTLs device can
  still be programmed to "default" transfer modes (it is only useful for
  debugging/testing purposes anyway).

* Remove no longer needed IDE_HFLAG_ABUSE_SET_DMA_MODE host flag, it was
  previously used by few host drivers to program the controller to PIO0
  timings for "default" transfer mode == 0x01 (although some host drivers
  would program invalid PIO timings instead).

* Cleanup ide_set_xfer_rate() and add BUG_ON().

Suggested-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 13af72f..7ac44d5 100644 (file)
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -266,22 +266,11 @@ int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
 
        rate = ide_rate_filter(drive, rate);
 
+       BUG_ON(rate < XFER_PIO_0);
+
        if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
                return ide_set_pio_mode(drive, rate);
 
-       /*
-        * TODO: transfer modes 0x00-0x07 passed from the user-space are
-        * currently handled here which needs fixing (please note that such
-        * case could happen iff the transfer mode has already been set on
-        * the device by ide-proc.c::set_xfer_rate()).
-        */
-       if (rate < XFER_PIO_0) {
-               if (hwif->host_flags & IDE_HFLAG_ABUSE_SET_DMA_MODE)
-                       return ide_set_dma_mode(drive, rate);
-               else
-                       return ide_config_drive_speed(drive, rate);
-       }
-
        return ide_set_dma_mode(drive, rate);
 }
 

diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index 54d57a1..151c91e 100644 (file)
--- a/drivers/ide/ide-proc.c
+++ b/drivers/ide/ide-proc.c
@@ -345,7 +345,7 @@ static int set_xfer_rate (ide_drive_t *drive, int arg)
        ide_task_t task;
        int err;
 
-       if (arg < 0 || (arg > 1 && arg < XFER_PIO_0) || arg > XFER_UDMA_6)
+       if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
                return -EINVAL;
 
        memset(&task, 0, sizeof(task));
@@ -357,7 +357,7 @@ static int set_xfer_rate (ide_drive_t *drive, int arg)
 
        err = ide_no_data_taskfile(drive, &task);
 
-       if (!err && arg) {
+       if (!err) {
                ide_set_xfer_rate(drive, (u8) arg);
                ide_driveid_update(drive);
        }

diff --git a/drivers/ide/pci/aec62xx.c b/drivers/ide/pci/aec62xx.c
index ae7a432..fbc43e1 100644 (file)
--- a/drivers/ide/pci/aec62xx.c
+++ b/drivers/ide/pci/aec62xx.c
@@ -195,7 +195,6 @@ static const struct ide_port_info aec62xx_chipsets[] __devinitdata = {
                .host_flags     = IDE_HFLAG_SERIALIZE |
                                  IDE_HFLAG_NO_ATAPI_DMA |
                                  IDE_HFLAG_NO_DSC |
-                                 IDE_HFLAG_ABUSE_SET_DMA_MODE |
                                  IDE_HFLAG_OFF_BOARD,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
@@ -205,7 +204,6 @@ static const struct ide_port_info aec62xx_chipsets[] __devinitdata = {
                .init_chipset   = init_chipset_aec62xx,
                .port_ops       = &atp86x_port_ops,
                .host_flags     = IDE_HFLAG_NO_ATAPI_DMA | IDE_HFLAG_NO_AUTODMA |
-                                 IDE_HFLAG_ABUSE_SET_DMA_MODE |
                                  IDE_HFLAG_OFF_BOARD,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
@@ -216,7 +214,6 @@ static const struct ide_port_info aec62xx_chipsets[] __devinitdata = {
                .enablebits     = {{0x4a,0x02,0x02}, {0x4a,0x04,0x04}},
                .port_ops       = &atp86x_port_ops,
                .host_flags     = IDE_HFLAG_NO_ATAPI_DMA |
-                                 IDE_HFLAG_ABUSE_SET_DMA_MODE |
                                  IDE_HFLAG_NON_BOOTABLE,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
@@ -226,7 +223,6 @@ static const struct ide_port_info aec62xx_chipsets[] __devinitdata = {
                .init_chipset   = init_chipset_aec62xx,
                .port_ops       = &atp86x_port_ops,
                .host_flags     = IDE_HFLAG_NO_ATAPI_DMA |
-                                 IDE_HFLAG_ABUSE_SET_DMA_MODE |
                                  IDE_HFLAG_OFF_BOARD,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,
@@ -237,7 +233,6 @@ static const struct ide_port_info aec62xx_chipsets[] __devinitdata = {
                .enablebits     = {{0x4a,0x02,0x02}, {0x4a,0x04,0x04}},
                .port_ops       = &atp86x_port_ops,
                .host_flags     = IDE_HFLAG_NO_ATAPI_DMA |
-                                 IDE_HFLAG_ABUSE_SET_DMA_MODE |
                                  IDE_HFLAG_OFF_BOARD,
                .pio_mask       = ATA_PIO4,
                .mwdma_mask     = ATA_MWDMA2,

diff --git a/drivers/ide/pci/amd74xx.c b/drivers/ide/pci/amd74xx.c
index 0bfcdd0..ef7d971 100644 (file)
--- a/drivers/ide/pci/amd74xx.c
+++ b/drivers/ide/pci/amd74xx.c
@@ -218,7 +218,6 @@ static const struct ide_port_ops amd_port_ops = {
 
 #define IDE_HFLAGS_AMD \
        (IDE_HFLAG_PIO_NO_BLACKLIST | \
-        IDE_HFLAG_ABUSE_SET_DMA_MODE | \
         IDE_HFLAG_POST_SET_MODE | \
         IDE_HFLAG_IO_32BIT | \
         IDE_HFLAG_UNMASK_IRQS)

diff --git a/drivers/ide/pci/cs5520.c b/drivers/ide/pci/cs5520.c
index d30cb4d..e8e7df1 100644 (file)
--- a/drivers/ide/pci/cs5520.c
+++ b/drivers/ide/pci/cs5520.c
@@ -97,8 +97,7 @@ static const struct ide_port_ops cs5520_port_ops = {
                .name           = name_str,                     \
                .port_ops       = &cs5520_port_ops,             \
                .host_flags     = IDE_HFLAG_ISA_PORTS |         \
-                                 IDE_HFLAG_CS5520 |            \
-                                 IDE_HFLAG_ABUSE_SET_DMA_MODE, \
+                                 IDE_HFLAG_CS5520,             \
                .pio_mask       = ATA_PIO4,                     \
        }
 

diff --git a/drivers/ide/pci/cs5535.c b/drivers/ide/pci/cs5535.c
index dc97c48..5404fe4 100644 (file)
--- a/drivers/ide/pci/cs5535.c
+++ b/drivers/ide/pci/cs5535.c
@@ -171,8 +171,7 @@ static const struct ide_port_ops cs5535_port_ops = {
 static const struct ide_port_info cs5535_chipset __devinitdata = {
        .name           = "CS5535",
        .port_ops       = &cs5535_port_ops,
-       .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_POST_SET_MODE |
-                         IDE_HFLAG_ABUSE_SET_DMA_MODE,
+       .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_POST_SET_MODE,
        .pio_mask       = ATA_PIO4,
        .mwdma_mask     = ATA_MWDMA2,
        .udma_mask      = ATA_UDMA4,

diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index 84c36c1..9e1d1c4 100644 (file)
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -123,7 +123,6 @@ static const struct ide_port_ops hpt34x_port_ops = {
 #define IDE_HFLAGS_HPT34X \
        (IDE_HFLAG_NO_ATAPI_DMA | \
         IDE_HFLAG_NO_DSC | \
-        IDE_HFLAG_ABUSE_SET_DMA_MODE | \
         IDE_HFLAG_NO_AUTODMA)
 
 static const struct ide_port_info hpt34x_chipsets[] __devinitdata = {

diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
index e5651ce..1f1135c 100644 (file)
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -1409,7 +1409,6 @@ static int __devinit hpt36x_init(struct pci_dev *dev, struct pci_dev *dev2)
 
 #define IDE_HFLAGS_HPT3XX \
        (IDE_HFLAG_NO_ATAPI_DMA | \
-        IDE_HFLAG_ABUSE_SET_DMA_MODE | \
         IDE_HFLAG_OFF_BOARD)
 
 static const struct ide_port_ops hpt3xx_port_ops = {

diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index 1c2f9df..e54dc65 100644 (file)
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -312,7 +312,6 @@ static void __devinit pdc202ata4_fixup_irq(struct pci_dev *dev,
 
 #define IDE_HFLAGS_PDC202XX \
        (IDE_HFLAG_ERROR_STOPS_FIFO | \
-        IDE_HFLAG_ABUSE_SET_DMA_MODE | \
         IDE_HFLAG_OFF_BOARD)
 
 static const struct ide_port_ops pdc20246_port_ops = {

diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index a1fb208..127ccb4 100644 (file)
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -349,9 +349,7 @@ static const struct ide_port_ops svwks_port_ops = {
        .cable_detect           = svwks_cable_detect,
 };
 
-#define IDE_HFLAGS_SVWKS \
-       (IDE_HFLAG_LEGACY_IRQS | \
-        IDE_HFLAG_ABUSE_SET_DMA_MODE)
+#define IDE_HFLAGS_SVWKS IDE_HFLAG_LEGACY_IRQS
 
 static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
        {       /* 0 */

diff --git a/drivers/ide/pci/tc86c001.c b/drivers/ide/pci/tc86c001.c
index a81d47c..477e197 100644 (file)
--- a/drivers/ide/pci/tc86c001.c
+++ b/drivers/ide/pci/tc86c001.c
@@ -206,8 +206,7 @@ static const struct ide_port_info tc86c001_chipset __devinitdata = {
        .init_hwif      = init_hwif_tc86c001,
        .port_ops       = &tc86c001_port_ops,
        .dma_ops        = &tc86c001_dma_ops,
-       .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD |
-                         IDE_HFLAG_ABUSE_SET_DMA_MODE,
+       .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD,
        .pio_mask       = ATA_PIO4,
        .mwdma_mask     = ATA_MWDMA2,
        .udma_mask      = ATA_UDMA4,

diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index e47384c..09dc480 100644 (file)
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -425,7 +425,6 @@ static const struct ide_port_info via82cxxx_chipset __devinitdata = {
        .enablebits     = { { 0x40, 0x02, 0x02 }, { 0x40, 0x01, 0x01 } },
        .port_ops       = &via_port_ops,
        .host_flags     = IDE_HFLAG_PIO_NO_BLACKLIST |
-                         IDE_HFLAG_ABUSE_SET_DMA_MODE |
                          IDE_HFLAG_POST_SET_MODE |
                          IDE_HFLAG_IO_32BIT,
        .pio_mask       = ATA_PIO5,

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 3f28894..260e871 100644 (file)
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1085,7 +1085,6 @@ enum {
        IDE_HFLAG_IO_32BIT              = (1 << 24),
        /* unmask IRQs */
        IDE_HFLAG_UNMASK_IRQS           = (1 << 25),
-       IDE_HFLAG_ABUSE_SET_DMA_MODE    = (1 << 26),
        /* serialize ports if DMA is possible (for sl82c105) */
        IDE_HFLAG_SERIALIZE_DMA         = (1 << 27),
        /* force host out of "simplex" mode */