ide: make legacy IDE VLB modules check for the "probe" kernel params (v2)

Legacy IDE VLB host drivers didn't check for "probe" options when compiled
as modules, which was obviously wrong as we don't want module to poke at
random I/O ports by simply loading it.  Fix it by adding "probe" module param
to legacy IDE VLB host drivers.

v2:
* don't obsolete old "ide0=dtc2278/ht6560b/qd65xx/ali14xx/umc8672"
  IDE driver options yet (per Alan Cox's request) and enhance documentation

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

7 files changed, 57 insertions, 15 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 49234e32fd16..5d134bb75ba1 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -1023,7 +1023,7 @@ config BLK_DEV_4DRIVES
 config BLK_DEV_ALI14XX
         tristate "ALI M14xx support"
         help
-          This driver is enabled at runtime using the "ide0=ali14xx" kernel
+          This driver is enabled at runtime using the "ali14xx.probe" kernel
           boot parameter.  It enables support for the secondary IDE interface
           of the ALI M1439/1443/1445/1487/1489 chipsets, and permits faster
           I/O speeds to be set as well.  See the files
@@ -1033,7 +1033,7 @@ config BLK_DEV_ALI14XX
 config BLK_DEV_DTC2278
         tristate "DTC-2278 support"
         help
-          This driver is enabled at runtime using the "ide0=dtc2278" kernel
+          This driver is enabled at runtime using the "dtc2278.probe" kernel
           boot parameter. It enables support for the secondary IDE interface
           of the DTC-2278 card, and permits faster I/O speeds to be set as
           well. See the <file:Documentation/ide.txt> and
@@ -1042,7 +1042,7 @@ config BLK_DEV_DTC2278
 config BLK_DEV_HT6560B
         tristate "Holtek HT6560B support"
         help
-          This driver is enabled at runtime using the "ide0=ht6560b" kernel
+          This driver is enabled at runtime using the "ht6560b.probe" kernel
           boot parameter. It enables support for the secondary IDE interface
           of the Holtek card, and permits faster I/O speeds to be set as well.
           See the <file:Documentation/ide.txt> and
@@ -1051,7 +1051,7 @@ config BLK_DEV_HT6560B
 config BLK_DEV_QD65XX
         tristate "QDI QD65xx support"
         help
-          This driver is enabled at runtime using the "ide0=qd65xx" kernel
+          This driver is enabled at runtime using the "qd65xx.probe" kernel
           boot parameter.  It permits faster I/O speeds to be set.  See the
           <file:Documentation/ide.txt> and <file:drivers/ide/legacy/qd65xx.c> for
           more info.
@@ -1059,7 +1059,7 @@ config BLK_DEV_QD65XX
 config BLK_DEV_UMC8672
         tristate "UMC-8672 support"
         help
-          This driver is enabled at runtime using the "ide0=umc8672" kernel
+          This driver is enabled at runtime using the "umc8672.probe" kernel
           boot parameter. It enables support for the secondary IDE interface
           of the UMC-8672, and permits faster I/O speeds to be set as well.
           See the files <file:Documentation/ide.txt> and
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index ac1a720f182a..dfbd74458522 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -1484,23 +1484,23 @@ static int __init match_parm (char *s, const char *keywords[], int vals[], int m
 }
 
 #ifdef CONFIG_BLK_DEV_ALI14XX
-static int __initdata probe_ali14xx;
+extern int probe_ali14xx;
 extern int ali14xx_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_UMC8672
-static int __initdata probe_umc8672;
+extern int probe_umc8672;
 extern int umc8672_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_DTC2278
-static int __initdata probe_dtc2278;
+extern int probe_dtc2278;
 extern int dtc2278_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_HT6560B
-static int __initdata probe_ht6560b;
+extern int probe_ht6560b;
 extern int ht6560b_init(void);
 #endif
 #ifdef CONFIG_BLK_DEV_QD65XX
-static int __initdata probe_qd65xx;
+extern int probe_qd65xx;
 extern int qd65xx_init(void);
 #endif
 
diff --git a/drivers/ide/legacy/ali14xx.c b/drivers/ide/legacy/ali14xx.c
index f9f5b8d54d6d..91961aa03047 100644
--- a/drivers/ide/legacy/ali14xx.c
+++ b/drivers/ide/legacy/ali14xx.c
@@ -228,9 +228,17 @@ static int __init ali14xx_probe(void)
         return 0;
 }
 
+int probe_ali14xx = 0;
+
+module_param_named(probe, probe_ali14xx, bool, 0);
+MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init ali14xx_init(void)
 {
+        if (probe_ali14xx == 0)
+                goto out;
+
         /* auto-detect IDE controller port */
         if (findPort()) {
                 if (ali14xx_probe())
@@ -238,6 +246,7 @@ int __init ali14xx_init(void)
                 return 0;
         }
         printk(KERN_ERR "ali14xx: not found.\n");
+out:
         return -ENODEV;
 }
 
diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
index f2903b6e43c0..0219ffa64db6 100644
--- a/drivers/ide/legacy/dtc2278.c
+++ b/drivers/ide/legacy/dtc2278.c
@@ -92,7 +92,7 @@ static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
         HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
 }
 
-static int __init probe_dtc2278(void)
+static int __init dtc2278_probe(void)
 {
         unsigned long flags;
         ide_hwif_t *hwif, *mate;
@@ -143,10 +143,18 @@ static int __init probe_dtc2278(void)
         return 0;
 }
 
+int probe_dtc2278 = 0;
+
+module_param_named(probe, probe_dtc2278, bool, 0);
+MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init dtc2278_init(void)
 {
-        if (probe_dtc2278()) {
+        if (probe_dtc2278 == 0)
+                return -ENODEV;
+
+        if (dtc2278_probe()) {
                 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
                 return -EBUSY;
         }
diff --git a/drivers/ide/legacy/ht6560b.c b/drivers/ide/legacy/ht6560b.c
index 02d5e20791e3..a2832643c522 100644
--- a/drivers/ide/legacy/ht6560b.c
+++ b/drivers/ide/legacy/ht6560b.c
@@ -301,12 +301,20 @@ static void tune_ht6560b (ide_drive_t *drive, u8 pio)
 #endif
 }
 
+int probe_ht6560b = 0;
+
+module_param_named(probe, probe_ht6560b, bool, 0);
+MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
+
 /* Can be called directly from ide.c. */
 int __init ht6560b_init(void)
 {
         ide_hwif_t *hwif, *mate;
         int t;
 
+        if (probe_ht6560b == 0)
+                return -ENODEV;
+
         hwif = &ide_hwifs[0];
         mate = &ide_hwifs[1];
 
diff --git a/drivers/ide/legacy/qd65xx.c b/drivers/ide/legacy/qd65xx.c
index ab482c85e415..2fb8f50f1293 100644
--- a/drivers/ide/legacy/qd65xx.c
+++ b/drivers/ide/legacy/qd65xx.c
@@ -488,9 +488,17 @@ static int __init qd_probe(int base)
         return 1;
 }
 
+int probe_qd65xx = 0;
+
+module_param_named(probe, probe_qd65xx, bool, 0);
+MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
+
 /* Can be called directly from ide.c. */
 int __init qd65xx_init(void)
 {
+        if (probe_qd65xx == 0)
+                return -ENODEV;
+
         if (qd_probe(0x30))
                 qd_probe(0xb0);
         if (ide_hwifs[0].chipset != ide_qd65xx &&
diff --git a/drivers/ide/legacy/umc8672.c b/drivers/ide/legacy/umc8672.c
index 6e2c58c5f6a2..ca7974455578 100644
--- a/drivers/ide/legacy/umc8672.c
+++ b/drivers/ide/legacy/umc8672.c
@@ -165,12 +165,21 @@ static int __init umc8672_probe(void)
         return 0;
 }
 
+int probe_umc8672 = 0;
+
+module_param_named(probe, probe_umc8672, bool, 0);
+MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
+
 /* Can be called directly from ide.c. */
 int __init umc8672_init(void)
 {
-        if (umc8672_probe())
-                return -ENODEV;
-        return 0;
+        if (probe_umc8672 == 0)
+                goto out;
+
+        if (umc8672_probe() == 0)
+                return 0;;
+out:
+        return -ENODEV;;
 }
 
 #ifdef MODULE