diff options
| author | Bryan Freed <bfreed@chromium.org> | 2013-03-13 22:17:40 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-01 17:22:59 +0400 |
| commit | b0b36b861e434ee1c1a64cb39259e262f79af62e (patch) | |
| tree | 57c741bdba95e18eab28fe82c2396b7b959c0f2a /drivers | |
| parent | 375981f2e14868be16cafbffd34a4f16a6ee01c6 (diff) | |
| download | linux-b0b36b861e434ee1c1a64cb39259e262f79af62e.tar.xz | |
spi: Unlock a spinlock before calling into the controller driver.
spi_pump_messages() calls into a controller driver with
unprepare_transfer_hardware() which is documented as "This may sleep".
As in the prepare_transfer_hardware() call below, we should release the
queue_lock spinlock before making the call.
Rework the logic a bit to hold queue_lock to protect the 'busy' flag,
then release it to call unprepare_transfer_hardware().
Signed-off-by: Bryan Freed <bfreed@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index f996c600eb8c..5b96250b0628 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -543,17 +543,16 @@ static void spi_pump_messages(struct kthread_work *work) /* Lock queue and check for queue work */ spin_lock_irqsave(&master->queue_lock, flags); if (list_empty(&master->queue) || !master->running) { - if (master->busy && master->unprepare_transfer_hardware) { - ret = master->unprepare_transfer_hardware(master); - if (ret) { - spin_unlock_irqrestore(&master->queue_lock, flags); - dev_err(&master->dev, - "failed to unprepare transfer hardware\n"); - return; - } + if (!master->busy) { + spin_unlock_irqrestore(&master->queue_lock, flags); + return; } master->busy = false; spin_unlock_irqrestore(&master->queue_lock, flags); + if (master->unprepare_transfer_hardware && + master->unprepare_transfer_hardware(master)) + dev_err(&master->dev, + "failed to unprepare transfer hardware\n"); return; } |