linux/drivers/s390/block
Sebastian Ott 181d95229b [S390] dasd: fix refcounting in dasd_change_state
To set a dasd online dasd_change_state is called twice. The first
cycle will schedule initial analysis of the device, set the rc to
-EAGAIN and will not touch the device state any more.
The initial analysis will in turn call dasd_change_state to increase
the state to the final DASD_STATE_ONLINE.

If the dasd_change_state on the second thread outruns the other one
both finish with the state set to DASD_STATE_ONLINE and the device
refcount will be decreased by 2.

Fix this by leaving dasd_change_state on rc == -EAGAIN so that the
refcount will always be decreased by 1.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-06-22 12:08:23 +02:00
..
Kconfig [S390] dasd: fix double elevator_exit call when deadline iosched fails to load 2008-04-17 07:46:55 +02:00
Makefile [S390] dasd: add hyper PAV support to DASD device driver, part 1 2008-01-26 14:11:28 +01:00
dasd.c [S390] dasd: fix refcounting in dasd_change_state 2009-06-22 12:08:23 +02:00
dasd_3990_erp.c [S390] dasd: message cleanup 2009-03-26 15:24:05 +01:00
dasd_alias.c [S390] dasd: message cleanup 2009-03-26 15:24:05 +01:00
dasd_devmap.c [S390] pm: dasd power management callbacks. 2009-06-16 10:31:10 +02:00
dasd_diag.c [S390] dasd: forward internal errors to dasd_sleep_on caller 2009-06-12 10:27:36 +02:00
dasd_diag.h [S390] dasd whitespace and other cosmetics. 2006-06-29 14:58:12 +02:00
dasd_eckd.c [S390] dasd_pm: fix stop flag handling 2009-06-22 12:08:22 +02:00
dasd_eckd.h [S390] dasd: add High Performance FICON support 2009-03-26 15:24:05 +01:00
dasd_eer.c [S390] dasd: message cleanup 2009-03-26 15:24:05 +01:00
dasd_erp.c [S390] dasd: message cleanup 2009-03-26 15:24:05 +01:00
dasd_fba.c [S390] pm: dasd power management callbacks. 2009-06-16 10:31:10 +02:00
dasd_fba.h [S390] dasd whitespace and other cosmetics. 2006-06-29 14:58:12 +02:00
dasd_genhd.c [S390] dasd: message cleanup 2009-03-26 15:24:05 +01:00
dasd_int.h [S390] pm: dasd power management callbacks. 2009-06-16 10:31:10 +02:00
dasd_ioctl.c [S390] dasd: message cleanup 2009-03-26 15:24:05 +01:00
dasd_proc.c proc 2/2: remove struct proc_dir_entry::owner 2009-03-31 01:14:44 +04:00
dcssblk.c [S390] pm: dcssblk power management callbacks. 2009-06-16 10:31:22 +02:00
xpram.c [S390] pm: xpram driver power management callbacks 2009-06-16 10:31:11 +02:00