powerpc: rtas: use get_user to simplify manage_flash_write

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Drop the local 10-byte buffer. The old code copied at most 9 bytes from
the user buffer, but only the first byte was used to select the RTAS
operation.

Use get_user() to read the command byte instead and compare it directly
with '0' and '1'. Drop the explicit user buffer check, since get_user()
will fail on a NULL pointer and correctly return -EFAULT instead of
-EINVAL. Remove the now-obsolete string constants as well as any
strncmp() and strlen() calls.

Return the original count instead of a potentially capped value, since
the full user write has been consumed once the command is accepted.

Use unsigned int op to better match the manage_flash() interface.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260528201226.1599977-3-thorsten.blum@linux.dev

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Thorsten Blum 2026-05-28 22:12:27 +02:00 • committed by Madhavan Srinivasan

parent 73dca15a3b

commit c7b7cea42c

1 changed files with 10 additions and 17 deletions

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arch/powerpc/kernel/rtas_flash.c

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