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Date: Wed, 16 Feb 2022 16:03:02 +0800 From: Tzung-Bi Shih <tzungbi@...gle.com> To: bleung@...omium.org, groeck@...omium.org Cc: chrome-platform@...ts.linux.dev, pmalani@...omium.org, tzungbi@...gle.com, linux-kernel@...r.kernel.org Subject: [PATCH v5 1/5] platform/chrome: cros_ec: fix error handling in cros_ec_register() Fix cros_ec_register() to unregister platform devices if blocking_notifier_chain_register() fails. Also use the single exit path to handle the platform device unregistration. Fixes: 42cd0ab476e2 ("platform/chrome: cros_ec: Query EC protocol version if EC transitions between RO/RW") Reviewed-by: Prashant Malani <pmalani@...omium.org> Signed-off-by: Tzung-Bi Shih <tzungbi@...gle.com> --- Changes from v4: (https://patchwork.kernel.org/project/chrome-platform/patch/20220216043639.3839185-2-tzungbi@google.com/) - Add R-b tag. Changes from v3: (https://patchwork.kernel.org/project/chrome-platform/patch/20220209095703.517608-2-tzungbi@google.com/) - Simplify by initializing the variables at the beginning. Changes from v2: (https://patchwork.kernel.org/project/chrome-platform/patch/20220209045035.380615-2-tzungbi@google.com/) - Fix grammar error in commit message. - Change the code that don't rely on zeroed memory. - Remove unnecessary `if` checks before calling platform_device_unregister(). Changes from v1: (https://lore.kernel.org/lkml/20220125101527.1812887-1-tzungbi@google.com/T/#u) - Use imperative mood in commit message. - Use IS_ERR_OR_NULL() in 1st patch. drivers/platform/chrome/cros_ec.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c index fc5aa1525d13..ff2a24b0c611 100644 --- a/drivers/platform/chrome/cros_ec.c +++ b/drivers/platform/chrome/cros_ec.c @@ -189,6 +189,8 @@ int cros_ec_register(struct cros_ec_device *ec_dev) ec_dev->max_request = sizeof(struct ec_params_hello); ec_dev->max_response = sizeof(struct ec_response_get_protocol_info); ec_dev->max_passthru = 0; + ec_dev->ec = NULL; + ec_dev->pd = NULL; ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); if (!ec_dev->din) @@ -245,18 +247,16 @@ int cros_ec_register(struct cros_ec_device *ec_dev) if (IS_ERR(ec_dev->pd)) { dev_err(ec_dev->dev, "Failed to create CrOS PD platform device\n"); - platform_device_unregister(ec_dev->ec); - return PTR_ERR(ec_dev->pd); + err = PTR_ERR(ec_dev->pd); + goto exit; } } if (IS_ENABLED(CONFIG_OF) && dev->of_node) { err = devm_of_platform_populate(dev); if (err) { - platform_device_unregister(ec_dev->pd); - platform_device_unregister(ec_dev->ec); dev_err(dev, "Failed to register sub-devices\n"); - return err; + goto exit; } } @@ -278,7 +278,7 @@ int cros_ec_register(struct cros_ec_device *ec_dev) err = blocking_notifier_chain_register(&ec_dev->event_notifier, &ec_dev->notifier_ready); if (err) - return err; + goto exit; } dev_info(dev, "Chrome EC device registered\n"); @@ -291,6 +291,10 @@ int cros_ec_register(struct cros_ec_device *ec_dev) cros_ec_irq_thread(0, ec_dev); return 0; +exit: + platform_device_unregister(ec_dev->ec); + platform_device_unregister(ec_dev->pd); + return err; } EXPORT_SYMBOL(cros_ec_register); -- 2.35.1.265.g69c8d7142f-goog
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