Remove mutex_lock from probe in order to avoid the following warning:
[ 8.526613] Freeing unused kernel memory: 232K (c0683000 - c06bd000)
starting pid 56, tty '': '/etc/rc.d/rcS'
[ 9.110314]
[ 9.111864] =====================================
[ 9.116603] [ BUG: init/1 still has locks held! ]
[ 9.121488] 3.15.0-rc4-next-20140509-00001-g319564e #1154 Not tainted
[ 9.128071] -------------------------------------
[ 9.132825] 1 lock held by init/1:
[ 9.136252] #0: (global_mutex){+.+.+.}, at: [<c0387d68>] mxs_dcp_probe+0x14
[ 9.144196]
[ 9.144196] stack backtrace:
[ 9.148888] CPU: 0 PID: 1 Comm: init Not tainted 3.15.0-rc4-next-20140509-004
[ 9.157610] [<c000da40>] (unwind_backtrace) from [<c000bda4>] (show_stack+0x)
[ 9.165595] [<c000bda4>] (show_stack) from [<c00153d4>] (do_fork+0x2c8/0x3cc)
[ 9.172921] [<c00153d4>] (do_fork) from [<c0015550>] (sys_vfork+0x20/0x2c)
[ 9.179973] [<c0015550>] (sys_vfork) from [<c0009580>] (ret_fast_syscall+0x0)
Signed-off-by: Fabio Estevam <[email protected]>
---
Changes since v1:
- Remove global_mutex entirely
drivers/crypto/mxs-dcp.c | 50 ++++++++++++++++--------------------------------
1 file changed, 16 insertions(+), 34 deletions(-)
diff --git a/drivers/crypto/mxs-dcp.c b/drivers/crypto/mxs-dcp.c
index 7bbe0ab..e48f0b8 100644
--- a/drivers/crypto/mxs-dcp.c
+++ b/drivers/crypto/mxs-dcp.c
@@ -104,7 +104,6 @@ struct dcp_sha_req_ctx {
* design of Linux Crypto API.
*/
static struct dcp *global_sdcp;
-static DEFINE_MUTEX(global_mutex);
/* DCP register layout. */
#define MXS_DCP_CTRL 0x00
@@ -907,60 +906,49 @@ static int mxs_dcp_probe(struct platform_device *pdev)
struct resource *iores;
int dcp_vmi_irq, dcp_irq;
- mutex_lock(&global_mutex);
if (global_sdcp) {
dev_err(dev, "Only one DCP instance allowed!\n");
- ret = -ENODEV;
- goto err_mutex;
+ return -ENODEV;
}
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dcp_vmi_irq = platform_get_irq(pdev, 0);
- if (dcp_vmi_irq < 0) {
- ret = dcp_vmi_irq;
- goto err_mutex;
- }
+ if (dcp_vmi_irq < 0)
+ return dcp_vmi_irq;
dcp_irq = platform_get_irq(pdev, 1);
- if (dcp_irq < 0) {
- ret = dcp_irq;
- goto err_mutex;
- }
+ if (dcp_irq < 0)
+ return dcp_irq;
sdcp = devm_kzalloc(dev, sizeof(*sdcp), GFP_KERNEL);
- if (!sdcp) {
- ret = -ENOMEM;
- goto err_mutex;
- }
+ if (!sdcp)
+ return -ENOMEM;
sdcp->dev = dev;
sdcp->base = devm_ioremap_resource(dev, iores);
- if (IS_ERR(sdcp->base)) {
- ret = PTR_ERR(sdcp->base);
- goto err_mutex;
- }
+ if (IS_ERR(sdcp->base))
+ return PTR_ERR(sdcp->base);
+
ret = devm_request_irq(dev, dcp_vmi_irq, mxs_dcp_irq, 0,
"dcp-vmi-irq", sdcp);
if (ret) {
dev_err(dev, "Failed to claim DCP VMI IRQ!\n");
- goto err_mutex;
+ return ret;
}
ret = devm_request_irq(dev, dcp_irq, mxs_dcp_irq, 0,
"dcp-irq", sdcp);
if (ret) {
dev_err(dev, "Failed to claim DCP IRQ!\n");
- goto err_mutex;
+ return ret;
}
/* Allocate coherent helper block. */
sdcp->coh = devm_kzalloc(dev, sizeof(*sdcp->coh) + DCP_ALIGNMENT,
GFP_KERNEL);
- if (!sdcp->coh) {
- ret = -ENOMEM;
- goto err_mutex;
- }
+ if (!sdcp->coh)
+ return -ENOMEM;
/* Re-align the structure so it fits the DCP constraints. */
sdcp->coh = PTR_ALIGN(sdcp->coh, DCP_ALIGNMENT);
@@ -968,7 +956,7 @@ static int mxs_dcp_probe(struct platform_device *pdev)
/* Restart the DCP block. */
ret = stmp_reset_block(sdcp->base);
if (ret)
- goto err_mutex;
+ return ret;
/* Initialize control register. */
writel(MXS_DCP_CTRL_GATHER_RESIDUAL_WRITES |
@@ -1006,8 +994,7 @@ static int mxs_dcp_probe(struct platform_device *pdev)
NULL, "mxs_dcp_chan/sha");
if (IS_ERR(sdcp->thread[DCP_CHAN_HASH_SHA])) {
dev_err(dev, "Error starting SHA thread!\n");
- ret = PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]);
- goto err_mutex;
+ return PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]);
}
sdcp->thread[DCP_CHAN_CRYPTO] = kthread_run(dcp_chan_thread_aes,
@@ -1064,9 +1051,6 @@ err_destroy_aes_thread:
err_destroy_sha_thread:
kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
-
-err_mutex:
- mutex_unlock(&global_mutex);
return ret;
}
@@ -1088,9 +1072,7 @@ static int mxs_dcp_remove(struct platform_device *pdev)
platform_set_drvdata(pdev, NULL);
- mutex_lock(&global_mutex);
global_sdcp = NULL;
- mutex_unlock(&global_mutex);
return 0;
}
--
1.8.3.2
On Mon, May 12, 2014 at 08:44:28AM -0300, Fabio Estevam wrote:
> Remove mutex_lock from probe in order to avoid the following warning:
>
> [ 8.526613] Freeing unused kernel memory: 232K (c0683000 - c06bd000)
> starting pid 56, tty '': '/etc/rc.d/rcS'
> [ 9.110314]
> [ 9.111864] =====================================
> [ 9.116603] [ BUG: init/1 still has locks held! ]
> [ 9.121488] 3.15.0-rc4-next-20140509-00001-g319564e #1154 Not tainted
> [ 9.128071] -------------------------------------
> [ 9.132825] 1 lock held by init/1:
> [ 9.136252] #0: (global_mutex){+.+.+.}, at: [<c0387d68>] mxs_dcp_probe+0x14
> [ 9.144196]
> [ 9.144196] stack backtrace:
> [ 9.148888] CPU: 0 PID: 1 Comm: init Not tainted 3.15.0-rc4-next-20140509-004
> [ 9.157610] [<c000da40>] (unwind_backtrace) from [<c000bda4>] (show_stack+0x)
> [ 9.165595] [<c000bda4>] (show_stack) from [<c00153d4>] (do_fork+0x2c8/0x3cc)
> [ 9.172921] [<c00153d4>] (do_fork) from [<c0015550>] (sys_vfork+0x20/0x2c)
> [ 9.179973] [<c0015550>] (sys_vfork) from [<c0009580>] (ret_fast_syscall+0x0)
>
> Signed-off-by: Fabio Estevam <[email protected]>
Patch applied. Thanks a lot!
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt