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| author | Lada Trimasova <ltrimas@synopsys.com> | 2016-03-09 20:21:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-12 09:08:56 -0700 |
| commit | f640dae8943ecbcc9ee6710aec89bba594512336 (patch) | |
| tree | 25ca576d7ebfe49cd36fab719c2b4eea421180e7 /kernel/sysctl_binary.c | |
| parent | 1f841628aca5d4133ad2aba0e2f279c8ab65b9d8 (diff) | |
ARC: [BE] readl()/writel() to work in Big Endian CPU configuration
commit f778cc65717687a3d3f26dd21bef62cd059f1b8b upstream.
read{l,w}() write{l,w}() primitives should use le{16,32}_to_cpu() and
cpu_to_le{16,32}() respectively to ensure device registers are read
correctly in Big Endian CPU configuration.
Per Arnd Bergmann
| Most drivers using readl() or readl_relaxed() expect those to perform byte
| swaps on big-endian architectures, as the registers tend to be fixed endian
This was needed for getting UART to work correctly on a Big Endian ARC.
The ARC accessors originally were fine, and the bug got introduced
inadventently by commit b8a033023994 ("ARCv2: barriers")
Fixes: b8a033023994 ("ARCv2: barriers")
Link: http://lkml.kernel.org/r/201603100845.30602.arnd@arndb.de
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lada Trimasova <ltrimas@synopsys.com>
[vgupta: beefed up changelog, added Fixes/stable tags]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/sysctl_binary.c')
0 files changed, 0 insertions, 0 deletions