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authorBrian Niebuhr <bniebuhr3@gmail.com>2010-07-02 17:30:17 +0200
committerGrant Likely <grant.likely@secretlab.ca>2010-07-04 06:59:18 +0200
commitb8f2e7bb6cff43efc4fa753761357cc7b7b13d26 (patch)
tree2be2618cc284340aac1d2171159ae5f0628c55e4 /drivers/spi/spi_bitbang.c
parentspi/spi-gpio: add support for controllers without MISO or MOSI pin (diff)
downloadlinux-b8f2e7bb6cff43efc4fa753761357cc7b7b13d26.tar.xz
linux-b8f2e7bb6cff43efc4fa753761357cc7b7b13d26.zip
spi/bitbang: reinitialize transfer parameters for every message
This patch fixes the setup_transfer logic to account for the case where multiple messages to different SPI devices are in the queue simultaneously. With the current logic, the second message in the queue will end up using the transfer parameters for the previous message in the queue. The fix is to reinitialize the transfer parameters for each message rather than only once on the first message. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/spi_bitbang.c')
-rw-r--r--drivers/spi/spi_bitbang.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index 5265330a528f..8b55724d5f39 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -259,7 +259,6 @@ static void bitbang_work(struct work_struct *work)
struct spi_bitbang *bitbang =
container_of(work, struct spi_bitbang, work);
unsigned long flags;
- int do_setup = -1;
int (*setup_transfer)(struct spi_device *,
struct spi_transfer *);
@@ -275,6 +274,7 @@ static void bitbang_work(struct work_struct *work)
unsigned tmp;
unsigned cs_change;
int status;
+ int do_setup = -1;
m = container_of(bitbang->queue.next, struct spi_message,
queue);
@@ -307,6 +307,8 @@ static void bitbang_work(struct work_struct *work)
status = setup_transfer(spi, t);
if (status < 0)
break;
+ if (do_setup == -1)
+ do_setup = 0;
}
/* set up default clock polarity, and activate chip;
@@ -367,11 +369,6 @@ static void bitbang_work(struct work_struct *work)
m->status = status;
m->complete(m->context);
- /* restore speed and wordsize if it was overridden */
- if (do_setup == 1)
- setup_transfer(spi, NULL);
- do_setup = 0;
-
/* normally deactivate chipselect ... unless no error and
* cs_change has hinted that the next message will probably
* be for this chip too.