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Subject[PATCH] Revert "spidev: fix hang when transfer_one_message fails"
Date
From: Geert Uytterhoeven <geert+renesas@linux-m68k.org>

This reverts commit e120cc0dcf2880a4c5c0a6cb27b655600a1cfa1d.

It causes a NULL pointer dereference with drivers using the generic
spi_transfer_one_message(), which always calls
spi_finalize_current_message(), which zeroes master->cur_msg.

Drivers implementing transfer_one_message() theirselves must always call
spi_finalize_current_message(), even if the transfer failed:

* @transfer_one_message: the subsystem calls the driver to transfer a single
* message while queuing transfers that arrive in the meantime. When the
* driver is finished with this message, it must call
* spi_finalize_current_message() so the subsystem can issue the next
* transfer

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
---
drivers/spi/spi.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index fe18a9d80213..5e43a31ee88a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -745,9 +745,7 @@ 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: %d\n", ret);
- master->cur_msg->status = ret;
- spi_finalize_current_message(master);
+ "failed to transfer one message from queue\n");
return;
}
}
--
1.7.9.5


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