staging: comedi: comedi_bond: use bitmap to record opened/closed minors

`do_dev_config()` currently records the comedi minor devices it has
opened by setting `devs_opened[minor]` to the pointer returned by
`comedi_open()`.  This is checked to avoid opening the same minor device
twice.  The pointer values in `devs_opened[]` aren't needed; we only
need to record which minor device numbers are being used.  Change
`devs_opened` to a bitmap (declared with `DECLARE_BITMAP()`) of length
`COMEDI_NUM_BOARD_MINORS` as the minor device numbers are range-checked
to fit in a bitmap of this length.  Use `test_and_set_bit()` to record
the minor device numbers we attempt to open with `comedi_open()`.

`bonding_detach()` calls `comedi_close()` to close the comedi minor
devices.  Since the minor device numbers may be repeated in its list of
bonded subdevices, it currently uses a simple `unsigned long
devs_closed` variable as a bitmap to keep track of which minor device
numbers it has already closed to avoid closing them twice.  As a single
`unsigned long` consists of less than `COMEDI_NUM_BOARD_MINORS` bits on
a 32-bit machine, change `devs_closed to a bitmap of this length using
`DECLARE_BITMAP()` and use `test_and_set_bit()` to avoid calling
`comedi_close()` more than once for each minor device number in use.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/comedi_bond.c b/drivers/staging/comedi/drivers/comedi_bond.c
index dd93e4f..c0a427c 100644 (file)
--- a/drivers/staging/comedi/drivers/comedi_bond.c
+++ b/drivers/staging/comedi/drivers/comedi_bond.c
@@ -190,10 +190,10 @@ static void *realloc(const void *oldmem, size_t newlen, size_t oldlen)
 static int do_dev_config(struct comedi_device *dev, struct comedi_devconfig *it)
 {
        struct comedi_bond_private *devpriv = dev->private;
+       DECLARE_BITMAP(devs_opened, COMEDI_NUM_BOARD_MINORS);
        int i;
-       struct comedi_device *devs_opened[COMEDI_NUM_BOARD_MINORS];
 
-       memset(devs_opened, 0, sizeof(devs_opened));
+       memset(&devs_opened, 0, sizeof(devs_opened));
        devpriv->name[0] = 0;
        /*
         * Loop through all comedi devices specified on the command-line,
@@ -216,7 +216,7 @@ static int do_dev_config(struct comedi_device *dev, struct comedi_devconfig *it)
                                "Cannot bond this driver to itself!\n");
                        return -EINVAL;
                }
-               if (devs_opened[minor]) {
+               if (test_and_set_bit(minor, devs_opened)) {
                        dev_err(dev->class_dev,
                                "Minor %d specified more than once!\n", minor);
                        return -EINVAL;
@@ -225,7 +225,7 @@ static int do_dev_config(struct comedi_device *dev, struct comedi_devconfig *it)
                snprintf(file, sizeof(file), "/dev/comedi%u", minor);
                file[sizeof(file) - 1] = 0;
 
-               d = devs_opened[minor] = comedi_open(file);
+               d = comedi_open(file);
 
                if (!d) {
                        dev_err(dev->class_dev,
@@ -342,19 +342,19 @@ static int bonding_attach(struct comedi_device *dev,
 static void bonding_detach(struct comedi_device *dev)
 {
        struct comedi_bond_private *devpriv = dev->private;
-       unsigned long devs_closed = 0;
 
        if (devpriv) {
+               DECLARE_BITMAP(devs_closed, COMEDI_NUM_BOARD_MINORS);
+
+               memset(&devs_closed, 0, sizeof(devs_closed));
                while (devpriv->ndevs-- && devpriv->devs) {
                        struct bonded_device *bdev;
 
                        bdev = devpriv->devs[devpriv->ndevs];
                        if (!bdev)
                                continue;
-                       if (!(devs_closed & (0x1 << bdev->minor))) {
+                       if (!test_and_set_bit(bdev->minor, devs_closed))
                                comedi_close(bdev->dev);
-                               devs_closed |= (0x1 << bdev->minor);
-                       }
                        kfree(bdev);
                }
                kfree(devpriv->devs);