tree d007845c788cb2a5b2d35ab01fc38a944e36c087
parent f79c44980aae3f50fe73e50789641df265953cc6
author Joakim Tjernlund <Joakim.Tjernlund@transmode.se> 1182900249 +0200
committer David Woodhouse <dwmw2@infradead.org> 1183053735 +0100

[JFFS2] Reduce time for which erase_free_sem is held during erase.

With current desing erase_free_sem is locked every time the flash
block is being erased. For NOR flashes - ~1 second is needed to erase
single flash block. In the worst case scenario erase_free_sem may be
locked for a couple of seconds when the number of blocks is being
erased (e.g. after large file was removed). When erase_free_sem is
locked all read/write operations for given JFFS2 partition are locked
too - in effect from time to time access to the JFFS2 partition is
locked for a number of seconds. This fix makes critical section in
flash erasing procedure shorter - now erase_free_sem is locked around
erase_completion_lock spinlock only.

Originally from Radoslaw Bisewski
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>