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[PATCH] 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 bfr...@chromium.org
---
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 fc0da39..f7f9df9 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -532,17 +532,16 @@ 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;
}
--
1.7.7.3
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