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authorLogan Gunthorpe <logang@deltatee.com>2019-01-16 11:25:18 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-22 13:39:59 +0100
commitaecc787c06f4300f4d954ef09a818e7e93e93cff (patch)
tree53c26ea8b052baa15d90afae40c76a4a7cea466a /arch/parisc/lib/iomap.c
parentinterconnect: Revert to previous config if any request fails (diff)
downloadlinux-dev-aecc787c06f4300f4d954ef09a818e7e93e93cff.tar.xz
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iomap: Use non-raw io functions for io{read|write}XXbe
Fix an asymmetry in the io{read|write}XXbe functions in that the big-endian variants make use of the raw io accessors while the little-endian variants use the regular accessors. Some architectures implement barriers to order against both spinlocks and DMA accesses and for these case, the big-endian variant of the API would not be protected. Thus, change the mmio_XXXXbe macros to use the appropriate swab() function wrapping the regular accessor. This is similar to what was done for PIO. When this code was originally written, barriers in the IO accessors were not common and the accessors simply wrapped the raw functions in a conversion to CPU endianness. Since then, barriers have been added in some architectures and are now missing in the big endian variant of the API. This also manages to silence a few sparse warnings that check for using the correct endian types which the original code did not annotate correctly. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Link: http://lkml.kernel.org/r/CAK8P3a25zQDxyaY3iVv+JmSSzs7F6ssGc+HdBkGs54ZfViX+Fg@mail.gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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