The patch titled
uml: handle block device hotplug errors
has been removed from the -mm tree. Its filename was
uml-handle-block-device-hotplug-errors.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: uml: handle block device hotplug errors
From: Jeff Dike <jdike@xxxxxxxxxxx>
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 <jdike@xxxxxxxxxxxxxxx>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/drivers/ubd_kern.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff -puN arch/um/drivers/ubd_kern.c~uml-handle-block-device-hotplug-errors arch/um/drivers/ubd_kern.c
--- a/arch/um/drivers/ubd_kern.c~uml-handle-block-device-hotplug-errors
+++ a/arch/um/drivers/ubd_kern.c
@@ -788,14 +788,12 @@ static int ubd_id(char **str, int *start
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 **erro
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]);
_
Patches currently in -mm which might be from jdike@xxxxxxxxxxx are
origin.patch
uml-hostfs-style-fixes.patch
uml-an-idle-system-should-have-zero-load-average.patch
remove-tas.patch
x86-create-asm-cmpxchgh.patch
uml-network-and-pcap-cleanup.patch
uml-pcap-devices-should-get-macs-from-command-line.patch
-
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