change history for this patch:
- v7
- simplify 32-bit/64-bit buffer pointer portability
- add pad member to struct mmc_ioc_cmd so its size is the same
when built for either 32-bit or 64-bit.
- register ``0xB3`` in Documentation/ioctl/ioctl-number.txt
- v6
- refix 32+64 compat pointer for better portability
- copy userspace pointer *before* using
- apply upper limit to data buffer size
- add flag to allow normal CMD opcodes as well as ACMD opcodes
- remove unnecessary mutex grab
- v5
- fix 32-bit compiler warning about the 32+64 compat pointer
- v4
- replace postsleep udelay() with usleep_range()
- add cmd_timeout_ms field for R1B commands
- v3
- copy data from userspace before claiming host
- break out copy from userspace into its own function
- verify that caller has CAP_SYS_RAWIO
- rename ``struct sd_ioc_cmd`` to ``struct mmc_ioc_cmd`` because it
applies generally, not just to SD
- make struct mmc_ioc_cmd the same between 32-bit and 64-bit to
simplify compat_ioctl()
- export include/linux/mmc/ioctl.h when you ``make headers_install``
- v2
- make initialization of struct declarations match kernel style
- only allow ioctl() on whole block device, not partition
- remove extraneous printks
- implement compat_ioctl()
- remove version field from ``struct sd_ioc_cmd``
John
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