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| author | Daniel Santos <daniel.santos@pobox.com> | 2014-01-05 23:39:26 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-13 21:50:15 (GMT) |
| commit | 24175707cb728921b5ad1cf1095d1600a07dda2e (patch) | |
| tree | 274fdff7ca7656cc3c196ba3d10fbfeed708c676 /drivers/spi/spi.c | |
| parent | dd00c35310801bcdb164a40e745f7def5cef8188 (diff) | |
| download | linux-fsl-qoriq-24175707cb728921b5ad1cf1095d1600a07dda2e.tar.xz | |
spidev: fix hang when transfer_one_message fails
commit e120cc0dcf2880a4c5c0a6cb27b655600a1cfa1d upstream.
This corrects a problem in spi_pump_messages() that leads to an spi
message hanging forever when a call to transfer_one_message() fails.
This failure occurs in my MCP2210 driver when the cs_change bit is set
on the last transfer in a message, an operation which the hardware does
not support.
Rationale
Since the transfer_one_message() returns an int, we must presume that it
may fail. If transfer_one_message() should never fail, it should return
void. Thus, calls to transfer_one_message() should properly manage a
failure.
Fixes: ffbbdd21329f3 (spi: create a message queueing infrastructure)
Signed-off-by: Daniel Santos <daniel.santos@pobox.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 9e039c6..30b1229 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -600,7 +600,9 @@ static void spi_pump_messages(struct kthread_work *work) ret = master->transfer_one_message(master, master->cur_msg); if (ret) { dev_err(&master->dev, - "failed to transfer one message from queue\n"); + "failed to transfer one message from queue: %d\n", ret); + master->cur_msg->status = ret; + spi_finalize_current_message(master); return; } } |