diff options
author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-12-02 07:54:25 +0400 |
---|---|---|
committer | Grant Likely <grant.likely@secretlab.ca> | 2012-12-06 18:03:14 +0400 |
commit | b3a223ee2d1a4635b0643c547bc0096a37334ed1 (patch) | |
tree | 0b0e7891825af66e8ecfdc6e3f14bbf2b1941991 /drivers/spi | |
parent | 266904c77911fdc0a064d97e2f06034b824c23ac (diff) | |
download | linux-b3a223ee2d1a4635b0643c547bc0096a37334ed1.tar.xz |
spi: Remove SPI_BUFSIZ restriction on spi_write_then_read()
In order to avoid constantly allocating and deallocating there is a fixed
buffer which spi_write_then_read() uses for transfers, with an early error
check to ensure that the transfer fits within the buffer. This limits the
size of transfers to this size, currently max(32, SMP_CACHE_BYTES).
Since we can dynamically allocate and in fact already have a fallback
to do so when there is contention for the fixed buffer remove this
restriction and instead dynamically allocate a suitably sized buffer if
the transfer won't fit.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/spi.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index f1217ae59f3d..22c71e238fdf 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1545,12 +1545,18 @@ int spi_write_then_read(struct spi_device *spi, struct spi_transfer x[2]; u8 *local_buf; - /* Use preallocated DMA-safe buffer. We can't avoid copying here, - * (as a pure convenience thing), but we can keep heap costs - * out of the hot path ... + /* Use preallocated DMA-safe buffer if we can. We can't avoid + * copying here, (as a pure convenience thing), but we can + * keep heap costs out of the hot path unless someone else is + * using the pre-allocated buffer or the transfer is too large. */ - if ((n_tx + n_rx) > SPI_BUFSIZ) - return -EINVAL; + if ((n_tx + n_rx) > SPI_BUFSIZ || !mutex_trylock(&lock)) { + local_buf = kmalloc(max(SPI_BUFSIZ, n_tx + n_rx), GFP_KERNEL); + if (!local_buf) + return -ENOMEM; + } else { + local_buf = buf; + } spi_message_init(&message); memset(x, 0, sizeof x); @@ -1563,14 +1569,6 @@ int spi_write_then_read(struct spi_device *spi, spi_message_add_tail(&x[1], &message); } - /* ... unless someone else is using the pre-allocated buffer */ - if (!mutex_trylock(&lock)) { - local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL); - if (!local_buf) - return -ENOMEM; - } else - local_buf = buf; - memcpy(local_buf, txbuf, n_tx); x[0].tx_buf = local_buf; x[1].rx_buf = local_buf + n_tx; |