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@xxxxxxxxxxxxxxx>
Signed-off-by: Chuanhua Han <chuanhua.han@xxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/spi/spi-mem.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 990770dfa5cf..ec0c24e873cd 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -328,10 +328,25 @@ EXPORT_SYMBOL_GPL(spi_mem_exec_op);
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);
--
2.17.1
