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author | Chris Lesiak <chris.lesiak@licor.com> | 2019-03-07 23:39:00 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 16:43:57 +0300 |
commit | 7406043618a52bb5b92c80966b05c6a4fca4e0aa (patch) | |
tree | 2412f6434337aedc15a872bcbf541dea66c8a416 /drivers/spi | |
parent | 2ce9855716ac5b6d5b63a3f6397bb4d49bf73af2 (diff) | |
download | linux-7406043618a52bb5b92c80966b05c6a4fca4e0aa.tar.xz |
spi: Fix zero length xfer bug
[ Upstream commit 5442dcaa0d90fc376bdfc179a018931a8f43dea4 ]
This fixes a bug for messages containing both zero length and
unidirectional xfers.
The function spi_map_msg will allocate dummy tx and/or rx buffers
for use with unidirectional transfers when the hardware can only do
a bidirectional transfer. That dummy buffer will be used in place
of a NULL buffer even when the xfer length is 0.
Then in the function __spi_map_msg, if he hardware can dma,
the zero length xfer will have spi_map_buf called on the dummy
buffer.
Eventually, __sg_alloc_table is called and returns -EINVAL
because nents == 0.
This fix prevents the error by not using the dummy buffer when
the xfer length is zero.
Signed-off-by: Chris Lesiak <chris.lesiak@licor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/spi.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 6cb72287eac8..a83fcddf1dad 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1041,6 +1041,8 @@ static int spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg) if (max_tx || max_rx) { list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (!xfer->len) + continue; if (!xfer->tx_buf) xfer->tx_buf = ctlr->dummy_tx; if (!xfer->rx_buf) |