parisc: Fix flush_dcache_page() for usage from irq context

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commit 61e150fb31 upstream.

Since at least kernel 6.1, flush_dcache_page() is called with IRQs
disabled, e.g. from aio_complete().

But the current implementation for flush_dcache_page() on parisc
unintentionally re-enables IRQs, which may lead to deadlocks.

Fix it by using xa_lock_irqsave() and xa_unlock_irqrestore()
for the flush_dcache_mmap_*lock() macros instead.

Cc: linux-parisc@vger.kernel.org
Cc: stable@kernel.org # 5.18+
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Helge Deller 2023-05-24 17:07:07 +02:00 • committed by Greg Kroah-Hartman

parent c0993b463f

commit c49ffd89b6

2 changed files with 7 additions and 2 deletions

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4

arch/parisc/include/asm/cacheflush.h

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5

arch/parisc/kernel/cache.c

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