4.20-stable review patch. If anyone has any objections, please let me know.
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From: Gilad Ben-Yossef gilad@benyossef.com
commit 1358c13a48c43f5e4de0c1835291837a27b9720c upstream.
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: Gilad Ben-Yossef gilad@benyossef.com Cc: Vincent Guittot vincent.guittot@linaro.org Cc: stable@kernel.org # v4.20 Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/crypto/ccree/cc_driver.c | 7 ++++--- drivers/crypto/ccree/cc_pm.c | 13 ++++++------- drivers/crypto/ccree/cc_pm.h | 3 +++ 3 files changed, 13 insertions(+), 10 deletions(-)
--- a/drivers/crypto/ccree/cc_driver.c +++ b/drivers/crypto/ccree/cc_driver.c @@ -364,7 +364,7 @@ static int init_cc_resources(struct plat 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 plat 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 @@ post_cipher_err: 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: --- a/drivers/crypto/ccree/cc_pm.c +++ b/drivers/crypto/ccree/cc_pm.c @@ -100,20 +100,19 @@ 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) --- a/drivers/crypto/ccree/cc_pm.h +++ b/drivers/crypto/ccree/cc_pm.h @@ -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_d 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)