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[Blackfin] arch: fix bug - a crash on bootup with CONFIG_MPU on the BF548 

The function flush_switched_dcplbs was clearing the CPLB entries covering
the process permission bitmasks.  This means that the sequence

	flush_switched_dcplbs ();
        set_mask_dcplbs(mm->context.page_rwx_mask);

has a problem: if kernel code (such as an interrupt) causes a CPLB miss before
set_mask_dcplbs completes, the CPLB handler function causes a double fault,
with an instantaneous reboot.

This bug fix is dedicated to Michael Hennerich, the only person in the world
capable of providing working JTAG hardware.

Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Bernd Schmidt 2008-04-24 02:56:36 +08:00 committed by Bryan Wu
parent 697a9d65aa
commit d56daae9be
1 changed files with 1 additions and 1 deletions
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2
arch/blackfin/kernel/cplb-mpu/cplbmgr.c
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@ -307,7 +307,7 @@ void flush_switched_cplbs(void)
enable_icplb();
disable_dcplb();
for (i = first_mask_dcplb; i < MAX_CPLBS; i++) {
for (i = first_switched_dcplb; i < MAX_CPLBS; i++) {
dcplb_tbl[i].data = 0;
bfin_write32(DCPLB_DATA0 + i * 4, 0);
}