linux-kernel - [PATCH 3.16 048/192] staging: comedi: fix clean-up of comedi_class in comedi

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Message-ID: <lsq.1507553064.723138126@decadent.org.uk>
Date:   Mon, 09 Oct 2017 13:44:24 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Ian Abbott" <abbotti@....co.uk>
Subject: [PATCH 3.16 048/192] staging: comedi: fix clean-up of
 comedi_class in comedi_init()

3.16.49-rc1 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>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -2626,6 +2626,7 @@ 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);