From b47d2debf229469c78af4145ee7ad35a0f21b67f Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Sun, 6 May 2007 14:51:01 -0700 Subject: [PATCH] uml: handle block device hotplug errors If a disk fails to open, i.e. its host file doesn't exist, it won't be removable because the hot-unplug code checks the existence of its gendisk. This won't exist because it is only allocated for successfully opened disks. Thus, a typo on the command line can result in a unusable and unfixable disk. This is fixed by freeing the gendisk if it's there, but not letting that affect the removal. Signed-off-by: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/drivers/ubd_kern.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 8bd9204ac1a..53c36d1770c 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -788,14 +788,12 @@ static int ubd_id(char **str, int *start_out, int *end_out) static int ubd_remove(int n, char **error_out) { + struct gendisk *disk; struct ubd *ubd_dev; int err = -ENODEV; mutex_lock(&ubd_lock); - if(ubd_gendisk[n] == NULL) - goto out; - ubd_dev = &ubd_devs[n]; if(ubd_dev->file == NULL) @@ -806,9 +804,12 @@ static int ubd_remove(int n, char **error_out) if(ubd_dev->count > 0) goto out; - del_gendisk(ubd_gendisk[n]); - put_disk(ubd_gendisk[n]); - ubd_gendisk[n] = NULL; + disk = ubd_gendisk[n]; + ubd_gendisk[n] = NULL; + if(disk != NULL){ + del_gendisk(disk); + put_disk(disk); + } if(fake_gendisk[n] != NULL){ del_gendisk(fake_gendisk[n]); -- 2.20.1