[PATCH v3 1/2] omap-sham: Use pm_runtime_put instead of pm_runtime_put_sync in tasklet

[PATCH v3 1/2] omap-sham: Use pm_runtime_put instead of pm_runtime_put_sync in tasklet

[agnel.joel]

From: Joel A Fernandes <joelagnel@ti.com>

After DMA is complete, the omap_sham_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
SHA operation.

Tested on an AM33xx SoC device (beaglebone board).
To reproduce the problem, used the tcrypt kernel module as:
modprobe tcrypt sec=2 mode=403

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: Mark A. Greer <mgreer@animalcreek.com>
---
 drivers/crypto/omap-sham.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index edff981..b8bb583 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -923,7 +923,7 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
 	dd->flags &= ~(BIT(FLAGS_BUSY) | BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
 			BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));
 
-	pm_runtime_put_sync(dd->dev);
+	pm_runtime_put(dd->dev);
 
 	if (req->base.complete)
 		req->base.complete(&req->base, err);
-- 
1.7.4.1

[PATCH v3 2/2] omap-aes: Use pm_runtime_put instead of pm_runtime_put_sync in tasklet

[agnel.joel]

From: Joel A Fernandes <joelagnel@ti.com>

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 <joelagnel@ti.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: Mark A. Greer <mgreer@animalcreek.com>
---
 drivers/crypto/omap-aes.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index cf57866..8450bfd2 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);
-- 
1.7.4.1

Re: [PATCH v3 2/2] omap-aes: Use pm_runtime_put instead of pm_runtime_put_sync in tasklet

[Mark A. Greer]

On Tue, Feb 26, 2013 at 10:04:32AM -0600, agnel.joel@gmail.com wrote:
> From: Joel A Fernandes <joelagnel@ti.com>
> 
> 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 <joelagnel@ti.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Mark A. Greer <mgreer@animalcreek.com>
> ---
>  drivers/crypto/omap-aes.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
> index cf57866..8450bfd2 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);

Acked-by: Mark A. Greer <mgreer@animalcreek.com>

Re: [PATCH v3 2/2] omap-aes: Use pm_runtime_put instead of pm_runtime_put_sync in tasklet

[Herbert Xu]

On Tue, Feb 26, 2013 at 04:06:36PM -0700, Mark A. Greer wrote:
> On Tue, Feb 26, 2013 at 10:04:32AM -0600, agnel.joel@gmail.com wrote:
> > From: Joel A Fernandes <joelagnel@ti.com>
> > 
> > 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 <joelagnel@ti.com>
> > Cc: Herbert Xu <herbert@gondor.apana.org.au>
> > Cc: David S. Miller <davem@davemloft.net>
> > Cc: Mark A. Greer <mgreer@animalcreek.com>
> > ---
> >  drivers/crypto/omap-aes.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
> > index cf57866..8450bfd2 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);
> 
> Acked-by: Mark A. Greer <mgreer@animalcreek.com>

Both patches applied.  Thanks!
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: [PATCH v3 1/2] omap-sham: Use pm_runtime_put instead of pm_runtime_put_sync in tasklet

[Mark A. Greer]

On Tue, Feb 26, 2013 at 10:04:31AM -0600, agnel.joel@gmail.com wrote:
> From: Joel A Fernandes <joelagnel@ti.com>
> 
> After DMA is complete, the omap_sham_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
> SHA operation.
> 
> Tested on an AM33xx SoC device (beaglebone board).
> To reproduce the problem, used the tcrypt kernel module as:
> modprobe tcrypt sec=2 mode=403
> 
> Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Mark A. Greer <mgreer@animalcreek.com>
> ---
>  drivers/crypto/omap-sham.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
> index edff981..b8bb583 100644
> --- a/drivers/crypto/omap-sham.c
> +++ b/drivers/crypto/omap-sham.c
> @@ -923,7 +923,7 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
>  	dd->flags &= ~(BIT(FLAGS_BUSY) | BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
>  			BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));
>  
> -	pm_runtime_put_sync(dd->dev);
> +	pm_runtime_put(dd->dev);
>  
>  	if (req->base.complete)
>  		req->base.complete(&req->base, err);

Acked-by: Mark A. Greer <mgreer@animalcreek.com>