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Subject[PATCH v3 14/23] platform/chrome: don't use devm variants for `din` and `dout`
Date
Don't use devm variants because the two buffers could be re-allocated
multiple times during runtime. Their life cycles aren't quite aligned
to the device's.

Normally, free the memory if any when the ec_dev gets unregistered in
cros_ec_unregister().

No need to free memory if kmalloc() fails. They will be freed
eventually in either of the following:
- Error handling path in cros_ec_register().
- In cros_ec_unregister().
- Next kmalloc() in cros_ec_query_all().

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v2:
- Don't use realloc.

Changes from v1:
- Don't use devm.
- Free in cros_ec_unregister().

drivers/platform/chrome/cros_ec.c | 4 +++
drivers/platform/chrome/cros_ec_proto.c | 29 ++++++++------------
drivers/platform/chrome/cros_ec_proto_test.c | 4 +--
3 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
index 29d3b544dafb..fb8cb8a73295 100644
--- a/drivers/platform/chrome/cros_ec.c
+++ b/drivers/platform/chrome/cros_ec.c
@@ -285,6 +285,8 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
exit:
platform_device_unregister(ec_dev->ec);
platform_device_unregister(ec_dev->pd);
+ kfree(ec_dev->din);
+ kfree(ec_dev->dout);
return err;
}
EXPORT_SYMBOL(cros_ec_register);
@@ -302,6 +304,8 @@ void cros_ec_unregister(struct cros_ec_device *ec_dev)
if (ec_dev->pd)
platform_device_unregister(ec_dev->pd);
platform_device_unregister(ec_dev->ec);
+ kfree(ec_dev->din);
+ kfree(ec_dev->dout);
}
EXPORT_SYMBOL(cros_ec_unregister);

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 473654f50bca..8a53e989c7e2 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -469,7 +469,6 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
*/
int cros_ec_query_all(struct cros_ec_device *ec_dev)
{
- struct device *dev = ec_dev->dev;
u32 ver_mask = 0;
int ret;

@@ -492,21 +491,18 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
}
}

- devm_kfree(dev, ec_dev->din);
- devm_kfree(dev, ec_dev->dout);
+ kfree(ec_dev->din);
+ ec_dev->din = NULL;
+ kfree(ec_dev->dout);
+ ec_dev->dout = NULL;

- ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
- if (!ec_dev->din) {
- ret = -ENOMEM;
- goto exit;
- }
+ ec_dev->din = kmalloc(ec_dev->din_size, GFP_KERNEL);
+ if (!ec_dev->din)
+ return -ENOMEM;

- ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
- if (!ec_dev->dout) {
- devm_kfree(dev, ec_dev->din);
- ret = -ENOMEM;
- goto exit;
- }
+ ec_dev->dout = kmalloc(ec_dev->dout_size, GFP_KERNEL);
+ if (!ec_dev->dout)
+ return -ENOMEM;

/* Probe if MKBP event is supported */
ret = cros_ec_get_host_command_version_mask(ec_dev,
@@ -555,10 +551,7 @@ int cros_ec_query_all(struct cros_ec_device *ec_dev)
"failed to retrieve wake mask: %d\n", ret);
}

- ret = 0;
-
-exit:
- return ret;
+ return 0;
}
EXPORT_SYMBOL(cros_ec_query_all);

diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
index 63071af81c94..ec106d0f5648 100644
--- a/drivers/platform/chrome/cros_ec_proto_test.c
+++ b/drivers/platform/chrome/cros_ec_proto_test.c
@@ -180,8 +180,8 @@ static void cros_ec_proto_test_query_all_pretest(struct kunit *test)

/*
* cros_ec_query_all() will free din and dout and allocate them again to fit the usage by
- * calling devm_kfree() and devm_kzalloc(). Set them to NULL as they aren't managed by
- * ec_dev->dev but allocated statically in struct cros_ec_proto_test_priv
+ * calling kfree() and kmalloc(). Set them to NULL as they aren't allocated by kmalloc()
+ * but allocated statically in struct cros_ec_proto_test_priv
* (see cros_ec_proto_test_init()).
*/
ec_dev->din = NULL;
--
2.36.1.255.ge46751e96f-goog
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