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| author | Andrew Morton <akpm@linux-foundation.org> | 2014-06-04 16:05:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:53:53 -0700 |
| commit | 2accff4ef5c5831a9cc6319394a9f61cc9de8534 (patch) | |
| tree | e60a28198315d86e17f40fe5ff3f0da5f03e84ff /arch/unicore32 | |
| parent | acc8a1c00585c5cd62fcafd9309ef40ac35e8bfa (diff) | |
| download | lwn-2accff4ef5c5831a9cc6319394a9f61cc9de8534.tar.gz lwn-2accff4ef5c5831a9cc6319394a9f61cc9de8534.zip | |
arch/unicore32/mm/ioremap.c: return NULL on invalid pfn
__uc32_ioremap_pfn_caller() should return NULL when the pfn is found to be
invalid.
From a recommendation by Guan Xuetao.
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/unicore32')
| -rw-r--r-- | arch/unicore32/mm/ioremap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/unicore32/mm/ioremap.c b/arch/unicore32/mm/ioremap.c index a0840fa05431..bf012b2b71a9 100644 --- a/arch/unicore32/mm/ioremap.c +++ b/arch/unicore32/mm/ioremap.c @@ -143,11 +143,13 @@ void __iomem *__uc32_ioremap_pfn_caller(unsigned long pfn, /* * Don't allow RAM to be mapped */ - if (pfn_valid(pfn)) + if (pfn_valid(pfn)) { WARN(1, "BUG: Your driver calls ioremap() on\n" "system memory. This leads to architecturally\n" "unpredictable behaviour, and ioremap() will fail in\n" "the next kernel release. Please fix your driver.\n"); + return NULL; + } type = get_mem_type(mtype); if (!type) |