pstore/ram: Strip ramoops header for correct decompression
pstore compression/decompression was added during 3.12. The ramoops driver prepends a "====timestamp.timestamp-C|D\n" header to the compressed record before handing it over to pstore driver which doesn't know about the header. In pstore_decompress(), the pstore driver reads the first "==" as a zlib header, so the decompression always fails. For example, this causes the driver to write /dev/pstore/dmesg-ramoops-0.enc.z instead of /dev/pstore/dmesg-ramoops-0. This patch makes the ramoops driver remove the header before pstore decompression. Signed-off-by: NBen Zhang <benzh@chromium.org> Acked-by: NKees Cook <keescook@chromium.org> Signed-off-by: NTony Luck <tony.luck@intel.com>
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