A local variant of sg_copy_buffer has been introduced in the meson-gx mmc driver [1] after
a mempcy optimization, fixing the iomem buffer manipulation and the reported system crash [2].
But, the fix is suboptimal in terms of performace/ugliness [3] and a proper I/O variant of
sg_copy_buffer should be added and used instead.
[1] https://lore.kernel.org/r/[email protected]
[2] https://lore.kernel.org/r/[email protected]
[3] https://lore.kernel.org/r/CAPDyKFrLSMpPJOgd5e4B1x3Vwfg4q23zgy4ESc8EmFL2MnyK7g@mail.gmail.com
Neil Armstrong (2):
scatterlist: add I/O variant of sg_pcopy & sg_copy
mmc: meson-gx: use sg_copy_to/from_io instead of local version
drivers/mmc/host/meson-gx-mmc.c | 53 +++-----------
include/linux/scatterlist.h | 14 ++++
lib/scatterlist.c | 119 ++++++++++++++++++++++++++++++++
3 files changed, 143 insertions(+), 43 deletions(-)
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2.25.1