diff options
| author | Helge Deller <deller@gmx.de> | 2023-08-22 17:27:49 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-25 02:20:31 +0300 |
| commit | 7db15418d390cf878d7c77ae08a4ad39f1534bc5 (patch) | |
| tree | 89c0d1cdfd00afdb004e131d62b03fd86480d310 /arch/nios2/mm | |
| parent | 8cfd014efd93e9450fcd4892bbfe8b10f41e53c3 (diff) | |
| download | linux-7db15418d390cf878d7c77ae08a4ad39f1534bc5.tar.xz | |
nios2: 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 NIOS2
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.
Link: https://lkml.kernel.org/r/ZOTF5WWURQNH9+iw@p100
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/nios2/mm')
| -rw-r--r-- | arch/nios2/mm/cacheflush.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c index 28b805f465a8..0ee9c5f02e08 100644 --- a/arch/nios2/mm/cacheflush.c +++ b/arch/nios2/mm/cacheflush.c @@ -75,12 +75,13 @@ static void flush_aliases(struct address_space *mapping, struct folio *folio) { struct mm_struct *mm = current->active_mm; struct vm_area_struct *vma; + unsigned long flags; pgoff_t pgoff; unsigned long nr = folio_nr_pages(folio); pgoff = folio->index; - flush_dcache_mmap_lock(mapping); + flush_dcache_mmap_lock_irqsave(mapping, flags); vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff + nr - 1) { unsigned long start; @@ -92,7 +93,7 @@ static void flush_aliases(struct address_space *mapping, struct folio *folio) start = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); flush_cache_range(vma, start, start + nr * PAGE_SIZE); } - flush_dcache_mmap_unlock(mapping); + flush_dcache_mmap_unlock_irqrestore(mapping, flags); } void flush_cache_all(void) |