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authorIan Abbott <abbotti@mev.co.uk>2013-01-28 17:07:39 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-30 11:47:47 +0100
commit682b911938f8c0e88c8204bb1178c2c7728d5661 (patch)
tree127e6384cb988bc9a3588ebdf53264d32bb160cf
parent754ab5c0e55dd118273ca2c217c4d95e9fbc8259 (diff)
staging: comedi: cleanup all board minors on module exit
The comedi core module optionally allocates some legacy board minor devices on module load and cleans these up on module exit. These are used for manual configuration of comedi boards (for those low-level comedi drivers that support manual configuration - mainly for ISA boards). Other board minor devices are created and destroyed dynamically in response to bus device probe and remove requests. The ioctl used for manual configuration (attachment) and removal (detachment) of devices is COMEDI_DEVCONFIG, but that works for any board minor device, including those that were originally created dynamically. If the COMEDI_DEVCONFIG ioctl is used to manually detach an automatically created and attached device, commit 7d3135af399e92cf4c9bbc5f86b6c140aab3b88c ("staging: comedi: prevent auto-unconfig of manually configured devices") ensures that the board minor will no longer be automatically detached and destroyed by a bus device remove request. From that point on the board minor behaves more like one of the comedi "legacy" board minors. (There would be some justification for destroying the board minor instead, but I'd rather leave that decision until removal of board minors has been made safer than it currently is.) Although the board minor behaves more like a legacy board minor, it is not currently cleaned up on module exit. In fact, the module exit code will bug out because this board minor has not been cleaned up. Change comedi_cleanup_legacy_minors() (called from the module exit code, and from the module init code on error) to clean up all board minors. Rename the function to comedi_cleanup_board_minors() to reflect the change in functionality. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/staging/comedi/comedi_fops.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 38e4fcb418c0..c7377d012a6d 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2415,11 +2415,11 @@ void comedi_free_subdevice_minor(struct comedi_subdevice *s)
kfree(info);
}
-static void comedi_cleanup_legacy_minors(void)
+static void comedi_cleanup_board_minors(void)
{
unsigned i;
- for (i = 0; i < comedi_num_legacy_minors; i++)
+ for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
comedi_free_board_minor(i);
}
@@ -2479,7 +2479,7 @@ static int __init comedi_init(void)
int minor;
minor = comedi_alloc_board_minor(NULL);
if (minor < 0) {
- comedi_cleanup_legacy_minors();
+ comedi_cleanup_board_minors();
cdev_del(&comedi_cdev);
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS);
@@ -2495,7 +2495,7 @@ static void __exit comedi_cleanup(void)
{
int i;
- comedi_cleanup_legacy_minors();
+ comedi_cleanup_board_minors();
for (i = 0; i < COMEDI_NUM_MINORS; ++i)
BUG_ON(comedi_file_info_table[i]);