Re: [PATCH 1/8] spi: stm32: properly handle 0 byte transfer
From: Mark Brown <broonie@kernel.org>
Date: 2021-02-06 00:07:55
Also in:
linux-spi, lkml
On Fri, Feb 05, 2021 at 12:08:55PM +0100, Alain Volmat wrote:
On 0 byte transfer request, return straight from the xfer function after finalizing the transfer.
+ if (transfer->len == 0) {
+ spi_finalize_current_transfer(master);
+ return 0;The driver only needs to finalize the transfer if it returned a value greater than 0, returning 0 indicates that the transfer is already done.