diff options
| author | Chuanhua Han <chuanhua.han@nxp.com> | 2018-08-30 16:43:24 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-09-10 18:41:46 +0100 |
| commit | e757996cafbeb6b71234a17130674bcd8f44c59e (patch) | |
| tree | d60e8692116913a9a4faeb0e776174f60de207d8 /drivers/spi/spi-mem.c | |
| parent | abf5feef3ff0cefade0c76be53b59e55fdd46093 (diff) | |
| download | linux-e757996cafbeb6b71234a17130674bcd8f44c59e.tar.bz2 | |
spi: spi-mem: Adjust op len based on message/transfer size limitations
We need that to adjust the len of the 2nd transfer (called data in
spi-mem) if it's too long to fit in a SPI message or SPI transfer.
Fixes: c36ff266dc82 ("spi: Extend the core to ease integration of SPI memory controllers")
Cc: <stable@vger.kernel.org>
Signed-off-by: Chuanhua Han <chuanhua.han@nxp.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-mem.c')
| -rw-r--r-- | drivers/spi/spi-mem.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index e43842c7a31a..eb72dba71d83 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -346,10 +346,25 @@ EXPORT_SYMBOL_GPL(spi_mem_get_name); int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) { struct spi_controller *ctlr = mem->spi->controller; + size_t len; + + len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes; if (ctlr->mem_ops && ctlr->mem_ops->adjust_op_size) return ctlr->mem_ops->adjust_op_size(mem, op); + if (!ctlr->mem_ops || !ctlr->mem_ops->exec_op) { + if (len > spi_max_transfer_size(mem->spi)) + return -EINVAL; + + op->data.nbytes = min3((size_t)op->data.nbytes, + spi_max_transfer_size(mem->spi), + spi_max_message_size(mem->spi) - + len); + if (!op->data.nbytes) + return -EINVAL; + } + return 0; } EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size); |