staging: zram: fix zram locking

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Currently init_lock only prevents concurrent execution of zram_init_device()
and zram_reset_device() but not zram_make_request() nor sysfs store functions.

This patch changes init_lock into a rw_semaphore. A write lock is taken by
init, reset and store functions, a read lock is taken by zram_make_request().
Also, avoids to release the lock before calling __zram_reset_device() for
cleaning after a failed init, thus preventing any concurrent task to see an
inconsistent state of zram.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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Jerome Marchand 2011-09-06 15:02:11 +02:00 • committed by Greg Kroah-Hartman

parent a1c821ae6c

commit 0900beae17

3 changed files with 44 additions and 26 deletions

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46

drivers/staging/zram/zram_drv.c

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6

drivers/staging/zram/zram_drv.h

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18

drivers/staging/zram/zram_sysfs.c

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