The patch
spi: spi-mem: Adjust op len based on message/transfer size limitations
has been applied to the spi tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
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Thanks, Mark
From e757996cafbeb6b71234a17130674bcd8f44c59e Mon Sep 17 00:00:00 2001
From: Chuanhua Han chuanhua.han@nxp.com Date: Thu, 30 Aug 2018 16:43:24 +0800 Subject: [PATCH] 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 --- 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 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);