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Date: Thu, 13 Jul 2017 17:40:34 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Ian Abbott <abbotti@....co.uk> Subject: [PATCH 4.9 20/25] staging: comedi: fix clean-up of comedi_class in comedi_init() 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Abbott <abbotti@....co.uk> commit a9332e9ad09c2644c99058fcf6ae2f355e93ce74 upstream. There is a clean-up bug in the core comedi module initialization functions, `comedi_init()`. If the `comedi_num_legacy_minors` module parameter is non-zero (and valid), it creates that many "legacy" devices and registers them in SysFS. A failure causes the function to clean up and return an error. Unfortunately, it fails to destroy the "comedi" class that was created earlier. Fix it by adding a call to `class_destroy(comedi_class)` at the appropriate place in the clean-up sequence. Signed-off-by: Ian Abbott <abbotti@....co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/staging/comedi/comedi_fops.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2908,6 +2908,7 @@ static int __init comedi_init(void) dev = comedi_alloc_board_minor(NULL); if (IS_ERR(dev)) { comedi_cleanup_board_minors(); + class_destroy(comedi_class); cdev_del(&comedi_cdev); unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
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