From 6c03e38b34dcfcdfa2f10cf984995a48f030f039 Mon Sep 17 00:00:00 2001 From: Chris Rankin Date: Sat, 20 Aug 2011 08:28:17 -0300 Subject: [PATCH] [media] em28xx: clean up resources should init fail This patch ensures that the em28xx_init_dev() function cleans up after itself, in the event that it fails. This isimportant because the struct em28xx will be deallocated if em28xx_init_dev() returns an error. [mchehab@redhat.com: Fix merge conflicts and simplify the goto labels] Signed-off-by: Chris Rankin Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/em28xx/em28xx-cards.c | 64 +++++++++++------------ drivers/media/video/em28xx/em28xx-core.c | 18 ++----- 2 files changed, 37 insertions(+), 45 deletions(-) diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c index 677db1454071..5fddcd0869de 100644 --- a/drivers/media/video/em28xx/em28xx-cards.c +++ b/drivers/media/video/em28xx/em28xx-cards.c @@ -2806,7 +2806,6 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, { struct em28xx *dev = *devhandle; int retval; - int errCode; dev->udev = udev; mutex_init(&dev->ctrl_urb_lock); @@ -2883,8 +2882,8 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, } if (dev->is_audio_only) { - errCode = em28xx_audio_setup(dev); - if (errCode) + retval = em28xx_audio_setup(dev); + if (retval) return -ENODEV; em28xx_add_into_devlist(dev); em28xx_init_extension(dev); @@ -2903,7 +2902,7 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, /* Resets I2C speed */ em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed); if (retval < 0) { - em28xx_errdev("%s: em28xx_write_regs_req failed!" + em28xx_errdev("%s: em28xx_write_reg failed!" " retval [%d]\n", __func__, retval); return retval; @@ -2917,12 +2916,11 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, } /* register i2c bus */ - errCode = em28xx_i2c_register(dev); - if (errCode < 0) { - v4l2_device_unregister(&dev->v4l2_dev); - em28xx_errdev("%s: em28xx_i2c_register - errCode [%d]!\n", - __func__, errCode); - return errCode; + retval = em28xx_i2c_register(dev); + if (retval < 0) { + em28xx_errdev("%s: em28xx_i2c_register - error [%d]!\n", + __func__, retval); + goto unregister_dev; } /* @@ -2936,11 +2934,11 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, em28xx_card_setup(dev); /* Configure audio */ - errCode = em28xx_audio_setup(dev); - if (errCode < 0) { - v4l2_device_unregister(&dev->v4l2_dev); - em28xx_errdev("%s: Error while setting audio - errCode [%d]!\n", - __func__, errCode); + retval = em28xx_audio_setup(dev); + if (retval < 0) { + em28xx_errdev("%s: Error while setting audio - error [%d]!\n", + __func__, retval); + goto fail; } /* wake i2c devices */ @@ -2954,31 +2952,28 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, if (dev->board.has_msp34xx) { /* Send a reset to other chips via gpio */ - errCode = em28xx_write_reg(dev, EM28XX_R08_GPIO, 0xf7); - if (errCode < 0) { - em28xx_errdev("%s: em28xx_write_regs_req - " - "msp34xx(1) failed! errCode [%d]\n", - __func__, errCode); - return errCode; + retval = em28xx_write_reg(dev, EM28XX_R08_GPIO, 0xf7); + if (retval < 0) { + em28xx_errdev("%s: em28xx_write_reg - " + "msp34xx(1) failed! error [%d]\n", + __func__, retval); + goto fail; } msleep(3); - errCode = em28xx_write_reg(dev, EM28XX_R08_GPIO, 0xff); - if (errCode < 0) { - em28xx_errdev("%s: em28xx_write_regs_req - " - "msp34xx(2) failed! errCode [%d]\n", - __func__, errCode); - return errCode; + retval = em28xx_write_reg(dev, EM28XX_R08_GPIO, 0xff); + if (retval < 0) { + em28xx_errdev("%s: em28xx_write_reg - " + "msp34xx(2) failed! error [%d]\n", + __func__, retval); + goto fail; } msleep(3); } - em28xx_add_into_devlist(dev); - retval = em28xx_register_analog_devices(dev); if (retval < 0) { - em28xx_release_resources(dev); - goto fail_reg_devices; + goto fail; } em28xx_init_extension(dev); @@ -2988,7 +2983,12 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev, return 0; -fail_reg_devices: +fail: + em28xx_i2c_unregister(dev); + +unregister_dev: + v4l2_device_unregister(&dev->v4l2_dev); + return retval; } diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c index 57b1b5c6d885..ebff91709b57 100644 --- a/drivers/media/video/em28xx/em28xx-core.c +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -1195,13 +1195,6 @@ void em28xx_remove_from_devlist(struct em28xx *dev) mutex_unlock(&em28xx_devlist_mutex); }; -void em28xx_add_into_devlist(struct em28xx *dev) -{ - mutex_lock(&em28xx_devlist_mutex); - list_add_tail(&dev->devlist, &em28xx_devlist); - mutex_unlock(&em28xx_devlist_mutex); -}; - /* * Extension interface */ @@ -1239,14 +1232,13 @@ EXPORT_SYMBOL(em28xx_unregister_extension); void em28xx_init_extension(struct em28xx *dev) { - struct em28xx_ops *ops = NULL; + const struct em28xx_ops *ops = NULL; mutex_lock(&em28xx_devlist_mutex); - if (!list_empty(&em28xx_extension_devlist)) { - list_for_each_entry(ops, &em28xx_extension_devlist, next) { - if (ops->init) - ops->init(dev); - } + list_add_tail(&dev->devlist, &em28xx_devlist); + list_for_each_entry(ops, &em28xx_extension_devlist, next) { + if (ops->init) + ops->init(dev); } mutex_unlock(&em28xx_devlist_mutex); } -- 2.20.1