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Commit 72eec6b3 authored by Gilad Ben-Yossef's avatar Gilad Ben-Yossef Committed by Greg Kroah-Hartman
Browse files

crypto: ccree - fix resume race condition on init 



[ Upstream commit 1358c13a48c43f5e4de0c1835291837a27b9720c ]

We were enabling autosuspend, which is using data set by the
hash module, prior to the hash module being inited, casuing
a crash on resume as part of the startup sequence if the race
was lost.

This was never a real problem because the PM infra was using low
res timers so we were always winning the race, until commit 8234f6734c5d
("PM-runtime: Switch autosuspend over to using hrtimers") changed that :-)

Fix this by seperating the PM setup and enablement and doing the
latter only at the end of the init sequence.

Signed-off-by: default avatarGilad Ben-Yossef <gilad@benyossef.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: stable@kernel.org # v4.20
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent f0e28655

drivers/crypto/ccree/cc_driver.c

+4 −3
Original line number Diff line number Diff line
@@ -364,7 +364,7 @@ static int init_cc_resources(struct platform_device *plat_dev) 
	rc = cc_ivgen_init(new_drvdata);

	if (rc) {

		dev_err(dev, "cc_ivgen_init failed\n");

		goto post_power_mgr_err;

		goto post_buf_mgr_err;

	}



	/* Allocate crypto algs */
@@ -387,6 +387,9 @@ static int init_cc_resources(struct platform_device *plat_dev) 
		goto post_hash_err;

	}



	/* All set, we can allow autosuspend */

	cc_pm_go(new_drvdata);



	/* If we got here and FIPS mode is enabled

	 * it means all FIPS test passed, so let TEE

	 * know we're good.
@@ -401,8 +404,6 @@ static int init_cc_resources(struct platform_device *plat_dev) 
	cc_cipher_free(new_drvdata);

post_ivgen_err:

	cc_ivgen_fini(new_drvdata);

post_power_mgr_err:

	cc_pm_fini(new_drvdata);

post_buf_mgr_err:

	 cc_buffer_mgr_fini(new_drvdata);

post_req_mgr_err:

drivers/crypto/ccree/cc_pm.c

+6 −7
Original line number Diff line number Diff line
@@ -103,20 +103,19 @@ int cc_pm_put_suspend(struct device *dev) 


int cc_pm_init(struct cc_drvdata *drvdata)

{

	int rc = 0;

	struct device *dev = drvdata_to_dev(drvdata);



	/* must be before the enabling to avoid resdundent suspending */

	pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT);

	pm_runtime_use_autosuspend(dev);

	/* activate the PM module */

	rc = pm_runtime_set_active(dev);

	if (rc)

		return rc;

	/* enable the PM module*/

	pm_runtime_enable(dev);

	return pm_runtime_set_active(dev);

}



	return rc;

/* enable the PM module*/

void cc_pm_go(struct cc_drvdata *drvdata)

{

	pm_runtime_enable(drvdata_to_dev(drvdata));

}



void cc_pm_fini(struct cc_drvdata *drvdata)

drivers/crypto/ccree/cc_pm.h

+3 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
extern const struct dev_pm_ops ccree_pm;



int cc_pm_init(struct cc_drvdata *drvdata);

void cc_pm_go(struct cc_drvdata *drvdata);

void cc_pm_fini(struct cc_drvdata *drvdata);

int cc_pm_suspend(struct device *dev);

int cc_pm_resume(struct device *dev);
@@ -29,6 +30,8 @@ static inline int cc_pm_init(struct cc_drvdata *drvdata) 
	return 0;

}



static void cc_pm_go(struct cc_drvdata *drvdata) {}



static inline void cc_pm_fini(struct cc_drvdata *drvdata) {}



static inline int cc_pm_suspend(struct device *dev)