[PATCH] libata-eh: Remove layering violation and duplication when handling absent ports

This removes the layering violation where drivers have to fiddle
directly with EH flags. Instead we now recognize -ENOENT means "no port"
and do the handling in the core code.

This also removes an instance of a call to disable the port, and an
identical printk from each driver doing this. Even better - future rule
changes will be in one place only.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

17 files changed, 67 insertions, 108 deletions

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index ffa111eea9d..5719704eb0e 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -643,11 +643,9 @@ static int piix_pata_prereset(struct ata_port *ap)
 {
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 
-        if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->port_no])) {
-                ata_port_printk(ap, KERN_INFO, "port disabled. ignoring.\n");
-                ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->port_no]))
+                return -ENOENT;
+                
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 3fa80f09f2a..02b2b2787d9 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1515,7 +1515,11 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
         if (prereset) {
                 rc = prereset(ap);
                 if (rc) {
-                        ata_port_printk(ap, KERN_ERR,
+                        if (rc == -ENOENT) {
+                                ata_port_printk(ap, KERN_DEBUG, "port disabled. ignoring.\n");
+                                ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+                        } else
+                                ata_port_printk(ap, KERN_ERR,
                                         "prereset failed (errno=%d)\n", rc);
                         return rc;
                 }
diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 3293cf9a7eb..793a5e1cb4c 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -25,7 +25,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_amd"
-#define DRV_VERSION "0.2.3"
+#define DRV_VERSION "0.2.4"
 
 /**
  *      timing_setup            -       shared timing computation and load
@@ -137,11 +137,8 @@ static int amd_pre_reset(struct ata_port *ap)
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
         u8 ata66;
 
-        if (!pci_test_config_bits(pdev, &amd_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &amd_enable_bits[ap->port_no]))
+                return -ENOENT;
 
         pci_read_config_byte(pdev, 0x42, &ata66);
         if (ata66 & bitmask[ap->port_no])
@@ -167,11 +164,9 @@ static int amd_early_pre_reset(struct ata_port *ap)
                 { 0x40, 1, 0x01, 0x01 }
         };
 
-        if (!pci_test_config_bits(pdev, &amd_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &amd_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         /* No host side cable detection */
         ap->cbl = ATA_CBL_PATA80;
         return ata_std_prereset(ap);
@@ -262,12 +257,8 @@ static int nv_pre_reset(struct ata_port *ap) {
         u8 ata66;
         u16 udma;
 
-        if (!pci_test_config_bits(pdev, &nv_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
-
+        if (!pci_test_config_bits(pdev, &nv_enable_bits[ap->port_no]))
+                return -ENOENT;
 
         pci_read_config_byte(pdev, 0x52, &ata66);
         if (ata66 & bitmask[ap->port_no])
diff --git a/drivers/ata/pata_artop.c b/drivers/ata/pata_artop.c
index d6ef3bf1bac..0f3b49176dc 100644
--- a/drivers/ata/pata_artop.c
+++ b/drivers/ata/pata_artop.c
@@ -28,7 +28,7 @@
 #include <linux/ata.h>
 
 #define DRV_NAME        "pata_artop"
-#define DRV_VERSION     "0.4.1"
+#define DRV_VERSION     "0.4.2"
 
 /*
  *      The ARTOP has 33 Mhz and "over clocked" timing tables. Until we
@@ -47,11 +47,9 @@ static int artop6210_pre_reset(struct ata_port *ap)
                 { 0x4AU, 1U, 0x04UL, 0x04UL },  /* port 1 */
         };
 
-        if (!pci_test_config_bits(pdev, &artop_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &artop_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
@@ -90,11 +88,9 @@ static int artop6260_pre_reset(struct ata_port *ap)
         u8 tmp;
 
         /* Odd numbered device ids are the units with enable bits (the -R cards) */
-        if (pdev->device % 1 && !pci_test_config_bits(pdev, &artop_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (pdev->device % 1 && !pci_test_config_bits(pdev, &artop_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         pci_read_config_byte(pdev, 0x49, &tmp);
         if (tmp & (1 >> ap->port_no))
                 ap->cbl = ATA_CBL_PATA40;
diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
index 3f78a1e54a7..060d019fd30 100644
--- a/drivers/ata/pata_atiixp.c
+++ b/drivers/ata/pata_atiixp.c
@@ -22,7 +22,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_atiixp"
-#define DRV_VERSION "0.4.2"
+#define DRV_VERSION "0.4.3"
 
 enum {
         ATIIXP_IDE_PIO_TIMING   = 0x40,
@@ -41,11 +41,9 @@ static int atiixp_pre_reset(struct ata_port *ap)
                 { 0x48, 1, 0x08, 0x00 }
         };
 
-        if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         ap->cbl = ATA_CBL_PATA80;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_efar.c b/drivers/ata/pata_efar.c
index c30bc181304..92813827faa 100644
--- a/drivers/ata/pata_efar.c
+++ b/drivers/ata/pata_efar.c
@@ -22,7 +22,7 @@
 #include <linux/ata.h>
 
 #define DRV_NAME        "pata_efar"
-#define DRV_VERSION     "0.4.1"
+#define DRV_VERSION     "0.4.2"
 
 /**
  *      efar_pre_reset  -       check for 40/80 pin
@@ -42,11 +42,9 @@ static int efar_pre_reset(struct ata_port *ap)
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
         u8 tmp;
 
-        if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         pci_read_config_byte(pdev, 0x47, &tmp);
         if (tmp & (2 >> ap->port_no))
                 ap->cbl = ATA_CBL_PATA40;
diff --git a/drivers/ata/pata_jmicron.c b/drivers/ata/pata_jmicron.c
index 6832a643a9e..3bdb6f2fa5b 100644
--- a/drivers/ata/pata_jmicron.c
+++ b/drivers/ata/pata_jmicron.c
@@ -51,7 +51,7 @@ static int jmicron_pre_reset(struct ata_port *ap)
         /* Check if our port is enabled */
         pci_read_config_dword(pdev, 0x40, &control);
         if ((control & port_mask) == 0)
-                return 0;
+                return -ENOENT;
 
         /* There are two basic mappings. One has the two SATA ports merged
            as master/slave and the secondary as PATA, the other has only the
diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
index 1958c4ed09a..3c65393c1f0 100644
--- a/drivers/ata/pata_mpiix.c
+++ b/drivers/ata/pata_mpiix.c
@@ -18,7 +18,7 @@
  * The driver conciously keeps this logic internally to avoid pushing quirky
  * PATA history into the clean libata layer.
  *
- * Thinkpad specific note: If you boot an MPIIX using thinkpad with a PCMCIA
+ * Thinkpad specific note: If you boot an MPIIX using a thinkpad with a PCMCIA
  * hard disk present this driver will not detect it. This is not a bug. In this
  * configuration the secondary port of the MPIIX is disabled and the addresses
  * are decoded by the PCMCIA bridge and therefore are for a generic IDE driver
@@ -35,7 +35,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_mpiix"
-#define DRV_VERSION "0.7.1"
+#define DRV_VERSION "0.7.2"
 
 enum {
         IDETIM = 0x6C,          /* IDE control register */
@@ -54,11 +54,8 @@ static int mpiix_pre_reset(struct ata_port *ap)
                 { 0x6F, 1, 0x80, 0x80 }
         };
 
-        if (!pci_test_config_bits(pdev, &mpiix_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &mpiix_enable_bits[ap->port_no]))
+                return -ENOENT;
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_ns87410.c b/drivers/ata/pata_ns87410.c
index 93d6646d295..f529fe4c29b 100644
--- a/drivers/ata/pata_ns87410.c
+++ b/drivers/ata/pata_ns87410.c
@@ -45,11 +45,8 @@ static int ns87410_pre_reset(struct ata_port *ap)
                 { 0x47, 1, 0x08, 0x08 }
         };
 
-        if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
+                return -ENOENT;
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_oldpiix.c b/drivers/ata/pata_oldpiix.c
index 04c618a2664..31a285ca88d 100644
--- a/drivers/ata/pata_oldpiix.c
+++ b/drivers/ata/pata_oldpiix.c
@@ -25,7 +25,7 @@
 #include <linux/ata.h>
 
 #define DRV_NAME        "pata_oldpiix"
-#define DRV_VERSION     "0.5.1"
+#define DRV_VERSION     "0.5.2"
 
 /**
  *      oldpiix_pre_reset               -       probe begin
@@ -42,11 +42,8 @@ static int oldpiix_pre_reset(struct ata_port *ap)
                 { 0x43U, 1U, 0x80UL, 0x80UL },  /* port 1 */
         };
 
-        if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &oldpiix_enable_bits[ap->port_no]))
+                return -ENOENT;
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_opti.c b/drivers/ata/pata_opti.c
index c3d01325e0e..136d7a65feb 100644
--- a/drivers/ata/pata_opti.c
+++ b/drivers/ata/pata_opti.c
@@ -34,7 +34,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_opti"
-#define DRV_VERSION "0.2.4"
+#define DRV_VERSION "0.2.5"
 
 enum {
         READ_REG        = 0,    /* index of Read cycle timing register */
@@ -59,11 +59,9 @@ static int opti_pre_reset(struct ata_port *ap)
                 { 0x40, 1, 0x08, 0x00 }
         };
 
-        if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_optidma.c b/drivers/ata/pata_optidma.c
index 177a455f425..18ec8e72bbb 100644
--- a/drivers/ata/pata_optidma.c
+++ b/drivers/ata/pata_optidma.c
@@ -33,7 +33,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_optidma"
-#define DRV_VERSION "0.2.1"
+#define DRV_VERSION "0.2.2"
 
 enum {
         READ_REG        = 0,    /* index of Read cycle timing register */
@@ -59,11 +59,9 @@ static int optidma_pre_reset(struct ata_port *ap)
                 0x40, 1, 0x08, 0x00
         };
 
-        if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits)) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))
+                return -ENOENT;
+
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_pdc2027x.c b/drivers/ata/pata_pdc2027x.c
index 31ab9c88620..bd4ed6734ed 100644
--- a/drivers/ata/pata_pdc2027x.c
+++ b/drivers/ata/pata_pdc2027x.c
@@ -36,7 +36,7 @@
 #include <asm/io.h>
 
 #define DRV_NAME        "pata_pdc2027x"
-#define DRV_VERSION     "0.74-ac3"
+#define DRV_VERSION     "0.74-ac5"
 #undef PDC_DEBUG
 
 #ifdef PDC_DEBUG
@@ -311,10 +311,8 @@ static inline int pdc2027x_port_enabled(struct ata_port *ap)
 static int pdc2027x_prereset(struct ata_port *ap)
 {
         /* Check whether port enabled */
-        if (!pdc2027x_port_enabled(ap)) {
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pdc2027x_port_enabled(ap))
+                return -ENOENT;
         pdc2027x_cbl_detect(ap);
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index 2e555168b43..fce74d9b2e6 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -34,7 +34,7 @@
 #include <linux/ata.h>
 
 #define DRV_NAME        "pata_sis"
-#define DRV_VERSION     "0.4.3"
+#define DRV_VERSION     "0.4.4"
 
 struct sis_chipset {
         u16 device;                     /* PCI host ID */
@@ -74,11 +74,9 @@ static int sis_133_pre_reset(struct ata_port *ap)
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
         u16 tmp;
 
-        if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no]))
+                return -ENOENT;
+
         /* The top bit of this register is the cable detect bit */
         pci_read_config_word(pdev, 0x50 + 2 * ap->port_no, &tmp);
         if (tmp & 0x8000)
diff --git a/drivers/ata/pata_sl82c105.c b/drivers/ata/pata_sl82c105.c
index f8499786917..b3bc607f029 100644
--- a/drivers/ata/pata_sl82c105.c
+++ b/drivers/ata/pata_sl82c105.c
@@ -19,7 +19,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_sl82c105"
-#define DRV_VERSION "0.2.2"
+#define DRV_VERSION "0.2.3"
 
 enum {
         /*
@@ -49,11 +49,8 @@ static int sl82c105_pre_reset(struct ata_port *ap)
         };
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 
-        if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                dev_printk(KERN_INFO, &pdev->dev, "port disabled. ignoring.\n");
-                return 0;
-        }
+        if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no]))
+                return -ENOENT;
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
diff --git a/drivers/ata/pata_triflex.c b/drivers/ata/pata_triflex.c
index 36f788728f3..95adf92901f 100644
--- a/drivers/ata/pata_triflex.c
+++ b/drivers/ata/pata_triflex.c
@@ -46,13 +46,13 @@
 #define DRV_VERSION "0.2.5"
 
 /**
- *      triflex_probe_init              -       probe begin
+ *      triflex_prereset                -       probe begin
  *      @ap: ATA port
  *
  *      Set up cable type and use generic probe init
  */
 
-static int triflex_probe_init(struct ata_port *ap)
+static int triflex_prereset(struct ata_port *ap)
 {
         static const struct pci_bits triflex_enable_bits[] = {
                 { 0x80, 1, 0x01, 0x01 },
@@ -61,11 +61,8 @@ static int triflex_probe_init(struct ata_port *ap)
 
         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 
-        if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no])) {
-                ata_port_disable(ap);
-                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                return 0;
-        }
+        if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
+                return -ENOENT;
         ap->cbl = ATA_CBL_PATA40;
         return ata_std_prereset(ap);
 }
@@ -74,7 +71,7 @@ static int triflex_probe_init(struct ata_port *ap)
 
 static void triflex_error_handler(struct ata_port *ap)
 {
-        ata_bmdma_drive_eh(ap, triflex_probe_init, ata_std_softreset, NULL, ata_std_postreset);
+        ata_bmdma_drive_eh(ap, triflex_prereset, ata_std_softreset, NULL, ata_std_postreset);
 }
 
 /**
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 1b2ff133b16..0e8b1303acd 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -60,7 +60,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_via"
-#define DRV_VERSION "0.1.13"
+#define DRV_VERSION "0.1.14"
 
 /*
  *      The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
@@ -155,11 +155,8 @@ static int via_pre_reset(struct ata_port *ap)
 
                 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 
-                if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no])) {
-                        ata_port_disable(ap);
-                        printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
-                        return 0;
-                }
+                if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
+                        return -ENOENT;
         }
 
         if ((config->flags & VIA_UDMA) >= VIA_UDMA_66)