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authorStefan Weinhuber <wein@de.ibm.com>2008-03-05 12:37:11 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-03-05 12:37:18 +0100
commita5e2383991ee985332854b721ba3e5abbbabf0f2 (patch)
tree6dee7e87d0fd0a93a041e773684724e6ca9af418 /drivers/s390/block
parent5c12f2406cea24a2c885a8d3e5aa7ab94c65f0d5 (diff)
[S390] dasd: fix reference counting in display method for proc/dasd/devices
Using the /proc/dasd/devices interface leaves the reference counter of alias devices in an inconsistent state. A process that tries to set such a device offline afterwards will hang. The dasd_devices_show function returns immediately for alias devices and this code path was missing a dasd_put_device call. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block')
-rw-r--r--drivers/s390/block/dasd_proc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c
index 28a86f07004..556063e8f7a 100644
--- a/drivers/s390/block/dasd_proc.c
+++ b/drivers/s390/block/dasd_proc.c
@@ -62,8 +62,10 @@ dasd_devices_show(struct seq_file *m, void *v)
return 0;
if (device->block)
block = device->block;
- else
+ else {
+ dasd_put_device(device);
return 0;
+ }
/* Print device number. */
seq_printf(m, "%s", device->cdev->dev.bus_id);
/* Print discipline string. */