lkml.org 
[lkml]   [2008]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 15/30] W1: w1_int.c use first available master number
    Date
    Follow the example of other devices (like the joystick device).  Pick
    the first available id for each detected device. Currently for USB
    devices, suspending and resuming would cause the number to increment.

    Signed-off-by: David Fries <david@fries.net>
    Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

    ---
    drivers/w1/w1_int.c | 32 ++++++++++++++++++++++++++------
    1 files changed, 26 insertions(+), 6 deletions(-)

    diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
    index 3fd6e66..a3a5456 100644
    --- a/drivers/w1/w1_int.c
    +++ b/drivers/w1/w1_int.c
    @@ -29,7 +29,6 @@
    #include "w1_netlink.h"
    #include "w1_int.h"

    -static u32 w1_ids = 1;
    static int w1_search_count = -1; /* Default is continual scan */
    module_param_named(search_count, w1_search_count, int, 0);

    @@ -102,9 +101,10 @@ static void w1_free_dev(struct w1_master *dev)

    int w1_add_master_device(struct w1_bus_master *master)
    {
    - struct w1_master *dev;
    + struct w1_master *dev, *entry;
    int retval = 0;
    struct w1_netlink_msg msg;
    + int id, found;

    /* validate minimum functionality */
    if (!(master->touch_bit && master->reset_bus) &&
    @@ -126,13 +126,33 @@ int w1_add_master_device(struct w1_bus_master *master)
    master->set_pullup = NULL;
    }

    - dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_master_driver, &w1_master_device);
    - if (!dev)
    + /* Lock until the device is added (or not) to w1_masters. */
    + mutex_lock(&w1_mlock);
    + /* Search for the first available id (starting at 1). */
    + id = 0;
    + do {
    + ++id;
    + found = 0;
    + list_for_each_entry(entry, &w1_masters, w1_master_entry) {
    + if (entry->id == id) {
    + found = 1;
    + break;
    + }
    + }
    + } while (found);
    +
    + dev = w1_alloc_dev(id, w1_max_slave_count, w1_max_slave_ttl,
    + &w1_master_driver, &w1_master_device);
    + if (!dev) {
    + mutex_unlock(&w1_mlock);
    return -ENOMEM;
    + }

    retval = w1_create_master_attributes(dev);
    - if (retval)
    + if (retval) {
    + mutex_unlock(&w1_mlock);
    goto err_out_free_dev;
    + }

    memcpy(dev->bus_master, master, sizeof(struct w1_bus_master));

    @@ -144,10 +164,10 @@ int w1_add_master_device(struct w1_bus_master *master)
    dev_err(&dev->dev,
    "Failed to create new kernel thread. err=%d\n",
    retval);
    + mutex_unlock(&w1_mlock);
    goto err_out_rm_attr;
    }

    - mutex_lock(&w1_mlock);
    list_add(&dev->w1_master_entry, &w1_masters);
    mutex_unlock(&w1_mlock);

    --
    1.4.4.4


    \
     
     \ /
      Last update: 2008-07-11 15:59    [W:0.024 / U:29.120 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site