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| author |   Bjorn Helgaas <bjorn.helgaas@hp.com> | 2006-03-27 01:17:04 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-27 08:44:53 -0800 |
| commit | f301ae6a690abe7edd2f92fa6df0b1b06986a6ad (patch) | |
| tree | 7ba628b3d11143589c2c9242120a5f18278d70ac /sound/drivers/mpu401 | |
| parent | [PATCH] pnp: parport: adjust pnp_register_driver signature (diff) | |
| download | linux-dev-f301ae6a690abe7edd2f92fa6df0b1b06986a6ad.tar.xz linux-dev-f301ae6a690abe7edd2f92fa6df0b1b06986a6ad.zip | |
[PATCH] pnp: mpu401: adjust pnp_register_driver signature
This series of patches removes the assumption that pnp_register_driver()
returns the number of devices claimed. Returning the count is unreliable
because devices may be hot-plugged in the future. (Many devices don't support
hot-plug, of course, but PNP in general does.)
This changes the convention to "zero for success, or a negative error value,"
which matches pci_register_driver(), acpi_bus_register_driver(), and
platform_driver_register().
If drivers need to know the number of devices, they can count calls to their
.probe() methods.
This patch:
Remove the assumption that pnp_register_driver() returns the number of devices
claimed.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Adam Belay <ambx1@neo.rr.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'sound/drivers/mpu401')
| -rw-r--r-- | sound/drivers/mpu401/mpu401.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/sound/drivers/mpu401/mpu401.c b/sound/drivers/mpu401/mpu401.c index 9d10d79e27af..9ea3059a7064 100644 --- a/sound/drivers/mpu401/mpu401.c +++ b/sound/drivers/mpu401/mpu401.c @@ -59,7 +59,8 @@ module_param_array(irq, int, NULL, 0444); MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device."); static struct platform_device *platform_devices[SNDRV_CARDS]; -static int pnp_registered = 0; +static int pnp_registered; +static unsigned int snd_mpu401_devices; static int snd_mpu401_create(int dev, struct snd_card **rcard) { @@ -197,6 +198,7 @@ static int __devinit snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev, } snd_card_set_dev(card, &pnp_dev->dev); pnp_set_drvdata(pnp_dev, card); + snd_mpu401_devices++; ++dev; return 0; } @@ -234,12 +236,11 @@ static void __init_or_module snd_mpu401_unregister_all(void) static int __init alsa_card_mpu401_init(void) { - int i, err, devices; + int i, err; if ((err = platform_driver_register(&snd_mpu401_driver)) < 0) return err; - devices = 0; for (i = 0; i < SNDRV_CARDS; i++) { struct platform_device *device; if (! enable[i]) @@ -255,14 +256,13 @@ static int __init alsa_card_mpu401_init(void) goto errout; } platform_devices[i] = device; - devices++; + snd_mpu401_devices++; } - if ((err = pnp_register_driver(&snd_mpu401_pnp_driver)) >= 0) { + err = pnp_register_driver(&snd_mpu401_pnp_driver); + if (!err) pnp_registered = 1; - devices += err; - } - if (!devices) { + if (!snd_mpu401_devices) { #ifdef MODULE printk(KERN_ERR "MPU-401 device not found or device busy\n"); #endif |