diff options
author | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-03-05 11:21:07 -0300 |
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committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-03-11 06:56:46 -0300 |
commit | 47677e51e2a4040c204d7971a5103592600185b1 (patch) | |
tree | 58196e42f5ad37ee12333a69593d444f0d1e10de /drivers/media/usb/em28xx/em28xx-cards.c | |
parent | 88e4fcda55e07278fcf5f6eea684685ffc0633e2 (diff) | |
download | linux-47677e51e2a4040c204d7971a5103592600185b1.tar.gz linux-47677e51e2a4040c204d7971a5103592600185b1.tar.xz |
[media] em28xx: Only deallocate struct em28xx after finishing all extensions
We can't free struct em28xx while one of the extensions is still
using it.
So, add a kref() to control it, freeing it only after the
extensions fini calls.
Reviewed-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-cards.c')
-rw-r--r-- | drivers/media/usb/em28xx/em28xx-cards.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index 2fb300e882f0..e7ec3b7866f1 100644 --- a/drivers/media/usb/em28xx/em28xx-cards.c +++ b/drivers/media/usb/em28xx/em28xx-cards.c @@ -2939,7 +2939,7 @@ static void flush_request_modules(struct em28xx *dev) * unregisters the v4l2,i2c and usb devices * called when the device gets disconnected or at module unload */ -void em28xx_release_resources(struct em28xx *dev) +static void em28xx_release_resources(struct em28xx *dev) { /*FIXME: I2C IR should be disconnected */ @@ -2956,7 +2956,27 @@ void em28xx_release_resources(struct em28xx *dev) mutex_unlock(&dev->lock); }; -EXPORT_SYMBOL_GPL(em28xx_release_resources); + +/** + * em28xx_free_device() - Free em28xx device + * + * @ref: struct kref for em28xx device + * + * This is called when all extensions and em28xx core unregisters a device + */ +void em28xx_free_device(struct kref *ref) +{ + struct em28xx *dev = kref_to_dev(ref); + + em28xx_info("Freeing device\n"); + + if (!dev->disconnected) + em28xx_release_resources(dev); + + kfree(dev->alt_max_pkt_size_isoc); + kfree(dev); +} +EXPORT_SYMBOL_GPL(em28xx_free_device); /* * em28xx_init_dev() @@ -3409,6 +3429,8 @@ static int em28xx_usb_probe(struct usb_interface *interface, dev->dvb_xfer_bulk ? "bulk" : "isoc"); } + kref_init(&dev->ref); + request_modules(dev); /* Should be the last thing to do, to avoid newer udev's to @@ -3453,11 +3475,7 @@ static void em28xx_usb_disconnect(struct usb_interface *interface) em28xx_close_extension(dev); em28xx_release_resources(dev); - - if (!dev->users) { - kfree(dev->alt_max_pkt_size_isoc); - kfree(dev); - } + kref_put(&dev->ref, em28xx_free_device); } static int em28xx_usb_suspend(struct usb_interface *interface, |