staging: comedi: allow buffer wraparound in comedi_write()

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`comedi_write()` copies data from the user buffer to the acquisition
data buffer, which is cyclic, using a single call to `copy_from_user()`.
It currently avoids having to deal with wraparound of the cyclic buffer
by limiting the amount it copies (and the amount returned to the user).
Change it to deal with the wraparound using two calls to
`copy_from_user()` if necessary.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ian Abbott 2015-11-18 17:55:08 +00:00 • committed by Greg Kroah-Hartman

parent 591c5f8a59

commit 35a7475dc8

1 changed files with 9 additions and 5 deletions

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drivers/staging/comedi/comedi_fops.c

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