parisc: Fix flush_dcache_page() for usage from irq context
authorHelge Deller <deller@gmx.de>
Wed, 24 May 2023 15:07:07 +0000 (17:07 +0200)
committerHelge Deller <deller@gmx.de>
Wed, 24 May 2023 17:03:49 +0000 (19:03 +0200)
commit61e150fb310729c98227a5edf6e4a3619edc3702
tree7ebebb4ec2ba0d111c4d3a3bbf968f445d5291ea
parent6888ff04e37d01295620a73f3f7efbc79f6ef152
parisc: Fix flush_dcache_page() for usage from irq context

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>
arch/parisc/include/asm/cacheflush.h
arch/parisc/kernel/cache.c