Add MODULE_PARM_DESC documentation and a kernel-parameters.txt entry.

Signed-off-by: Maciej W. Rozycki <[email protected]>
---
 Documentation/admin-guide/kernel-parameters.txt |    7 +++++++
 drivers/ata/pata_platform.c                     |    4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

linux-pata-platform-parm-desc.diff
Index: linux-dolch/Documentation/admin-guide/kernel-parameters.txt
===================================================================
--- linux-dolch.orig/Documentation/admin-guide/kernel-parameters.txt
+++ linux-dolch/Documentation/admin-guide/kernel-parameters.txt
@@ -3640,6 +3640,13 @@
                        By default set to 1 if CONFIG_PATA_WINBOND_VLB_MODULE,
                        0 otherwise.
 
+       pata_platform.pio_mask= [HW,LIBATA]
+                       Format: <int>
+                       Supported PIO mode mask.  Set individual bits to allow
+                       the use of the respective PIO modes.  Bit 0 is for
+                       mode 0, bit 1 is for mode 1, and so on.  Mode 0 only
+                       allowed by default.
+
        pause_on_oops=
                        Halt all CPUs after the first oops has been printed for
                        the specified number of seconds.  This is to be used if
Index: linux-dolch/drivers/ata/pata_platform.c
===================================================================
--- linux-dolch.orig/drivers/ata/pata_platform.c
+++ linux-dolch/drivers/ata/pata_platform.c
@@ -24,6 +24,8 @@
 #define DRV_VERSION "1.2"
 
 static int pio_mask = 1;
+module_param(pio_mask, int, 0);
+MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default");
 
 /*
  * Provide our own set_mode() as we don't want to change anything that has
@@ -233,8 +235,6 @@ static struct platform_driver pata_platf
 
 module_platform_driver(pata_platform_driver);
 
-module_param(pio_mask, int, 0);
-
 MODULE_AUTHOR("Paul Mundt");
 MODULE_DESCRIPTION("low-level driver for platform device ATA");
 MODULE_LICENSE("GPL");

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