From 2cfb8ce8c87802181ade74f5dadb3dded9bb4c7e Mon Sep 17 00:00:00 2001 From: Jan Nikitenko Date: Thu, 13 Mar 2008 12:32:39 -0700 Subject: [PATCH] spi_bitbang: short transfer status fix SPI controller drivers return number of bytes actually transfered from bitbang->txrx_bufs() method. This updates handling of short transfers (where the transfer size is less than requested): - Even zero byte short transfers should report errors; - Include short transfers in the total of transferred bytes; - Use EREMOTEIO (like USB) not EMSGSIZE to report short transfers Short transfers don't normally mean invalid message sizes, but if the underlying controller driver needs to use EMSGSIZE it can still do so. [db: fix two more minor issues] Signed-off-by: Jan Nikitenko Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_bitbang.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c index f7f8580edad..71e881419cd 100644 --- a/drivers/spi/spi_bitbang.c +++ b/drivers/spi/spi_bitbang.c @@ -344,12 +344,14 @@ static void bitbang_work(struct work_struct *work) t->rx_dma = t->tx_dma = 0; status = bitbang->txrx_bufs(spi, t); } + if (status > 0) + m->actual_length += status; if (status != t->len) { - if (status > 0) - status = -EMSGSIZE; + /* always report some kind of error */ + if (status >= 0) + status = -EREMOTEIO; break; } - m->actual_length += status; status = 0; /* protocol tweaks before next transfer */ -- 2.20.1