From bbbaa37428abac025fe11b83933473888ddf6fc1 Mon Sep 17 00:00:00 2001 From: Joel A Fernandes Date: Tue, 26 Feb 2013 10:04:32 -0600 Subject: [PATCH] crypto: omap-aes - Use pm_runtime_put instead of pm_runtime_put_sync in tasklet After DMA is complete, the omap_aes_finish_req function is called as a part of the done_task tasklet. During this its atomic and any calls to pm functions should not assume they wont sleep. The patch replaces a call to pm_runtime_put_sync (which can sleep) with pm_runtime_put thus fixing a kernel panic observed on AM33xx SoC during AES operation. Tested on an AM33xx SoC device (beaglebone board). To reproduce the problem, I used the tcrypt kernel module as: modprobe tcrypt sec=2 mode=500 Signed-off-by: Joel A Fernandes Cc: David S. Miller Acked-by: Mark A. Greer Signed-off-by: Herbert Xu --- drivers/crypto/omap-aes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c index 6aa425fe0ed5..1e5a17adefe4 100644 --- a/drivers/crypto/omap-aes.c +++ b/drivers/crypto/omap-aes.c @@ -636,7 +636,7 @@ static void omap_aes_finish_req(struct omap_aes_dev *dd, int err) pr_debug("err: %d\n", err); - pm_runtime_put_sync(dd->dev); + pm_runtime_put(dd->dev); dd->flags &= ~FLAGS_BUSY; req->base.complete(&req->base, err); -- GitLab