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spi: Replace if-else-if by bitops and multiplications
author
Andy Shevchenko
<andriy.shevchenko@linux.intel.com>
Mon, 10 Jul 2023 15:49:20 +0000
(18:49 +0300)
committer
Mark Brown
<broonie@kernel.org>
Mon, 10 Jul 2023 17:27:44 +0000
(18:27 +0100)
Instead of if-else-if, simply call roundup_pow_of_two(BITS_PER_BYTES()).
Note, there is no division assumed as compiler may optimize it away.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link:
https://lore.kernel.org/r/20230710154932.68377-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi.c
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diff --git
a/drivers/spi/spi.c
b/drivers/spi/spi.c
index
6d74218
..
125dea8
100644
(file)
--- a/
drivers/spi/spi.c
+++ b/
drivers/spi/spi.c
@@
-3643,13
+3643,7
@@
int spi_split_transfers_maxwords(struct spi_controller *ctlr,
size_t maxsize;
int ret;
- if (xfer->bits_per_word <= 8)
- maxsize = maxwords;
- else if (xfer->bits_per_word <= 16)
- maxsize = 2 * maxwords;
- else
- maxsize = 4 * maxwords;
-
+ maxsize = maxwords * roundup_pow_of_two(BITS_TO_BYTES(xfer->bits_per_word));
if (xfer->len > maxsize) {
ret = __spi_split_transfer_maxsize(ctlr, msg, &xfer,
maxsize, gfp);