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The simple_write_to_buffer() function will return positive/success if it
is able to write a single byte anywhere within the buffer. However that
potentially leaves a lot of the buffer uninitialized.
In this code it's better to return 0 if the offset is non-zero. This
code is not written to support partial writes. And then return -EFAULT
if the buffer is not completely initialized.
Fixes: cfad642538 ("eeprom: Add IDT 89HPESx EEPROM/CSR driver")
Reviewed-by: Serge Semin <[email protected]>
Signed-off-by: Dan Carpenter <[email protected]>
Link: https://lore.kernel.org/r/Ysg1Pu/nzSMe3r1q@kili
Signed-off-by: Greg Kroah-Hartman <[email protected]>