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From: Bhaumik Bhatt <bbhatt@codeaurora.org>
To: manivannan.sadhasivam@linaro.org
Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
	jhugo@codeaurora.org, linux-kernel@vger.kernel.org,
	Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [PATCH v6 10/11] bus: mhi: core: Introduce APIs to allocate and free the MHI controller
Date: Mon, 27 Jul 2020 19:02:19 -0700
Message-ID: <1595901740-27379-11-git-send-email-bbhatt@codeaurora.org> (raw)
In-Reply-To: <1595901740-27379-1-git-send-email-bbhatt@codeaurora.org>

Client devices should use the APIs provided to allocate and free
the MHI controller structure. This will help ensure that the
structure is zero-initialized and there are no false positives
with respect to reading any values such as the serial number or
the OEM PK hash.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
---
 drivers/bus/mhi/core/init.c | 16 ++++++++++++++++
 include/linux/mhi.h         | 12 ++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index d2c0f6e..972dbf0 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -959,6 +959,22 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl)
 }
 EXPORT_SYMBOL_GPL(mhi_unregister_controller);
 
+struct mhi_controller *mhi_alloc_controller(void)
+{
+	struct mhi_controller *mhi_cntrl;
+
+	mhi_cntrl = kzalloc(sizeof(*mhi_cntrl), GFP_KERNEL);
+
+	return mhi_cntrl;
+}
+EXPORT_SYMBOL_GPL(mhi_alloc_controller);
+
+void mhi_free_controller(struct mhi_controller *mhi_cntrl)
+{
+	kfree(mhi_cntrl);
+}
+EXPORT_SYMBOL_GPL(mhi_free_controller);
+
 int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 {
 	struct device *dev = &mhi_cntrl->mhi_dev->dev;
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index d15e9ce..a35d876 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -530,6 +530,18 @@ struct mhi_driver {
 #define to_mhi_device(dev) container_of(dev, struct mhi_device, dev)
 
 /**
+ * mhi_alloc_controller - Allocate the MHI Controller structure
+ * Allocate the mhi_controller structure using zero initialized memory
+ */
+struct mhi_controller *mhi_alloc_controller(void);
+
+/**
+ * mhi_free_controller - Free the MHI Controller structure
+ * Free the mhi_controller structure which was previously allocated
+ */
+void mhi_free_controller(struct mhi_controller *mhi_cntrl);
+
+/**
  * mhi_register_controller - Register MHI controller
  * @mhi_cntrl: MHI controller to register
  * @config: Configuration to use for the controller
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28  2:02 [PATCH v6 00/11] Introduce features and debugfs/sysfs entries for MHI Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 01/11] bus: mhi: core: Remove double occurrence for mhi_ctrl_ev_task() declaration Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 02/11] bus: mhi: core: Abort suspends due to outgoing pending packets Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 03/11] bus: mhi: core: Use helper API to trigger a non-blocking host resume Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 04/11] bus: mhi: core: Trigger host resume if suspended during mhi_device_get() Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 05/11] bus: mhi: core: Use generic name field for an MHI device Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 06/11] bus: mhi: core: Introduce helper function to check device state Bhaumik Bhatt
2020-07-28  2:02 ` [PATCH v6 07/11] bus: mhi: core: Introduce counters to track MHI device state transitions Bhaumik Bhatt
2020-08-07  5:13   ` Manivannan Sadhasivam
2020-07-28  2:02 ` [PATCH v6 08/11] bus: mhi: core: Introduce debugfs entries for MHI Bhaumik Bhatt
2020-08-01  7:08   ` kernel test robot
2020-07-28  2:02 ` [PATCH v6 09/11] bus: mhi: core: Read and save device hardware information from BHI Bhaumik Bhatt
2020-07-28  2:02 ` Bhaumik Bhatt [this message]
2020-08-07  5:15   ` [PATCH v6 10/11] bus: mhi: core: Introduce APIs to allocate and free the MHI controller Manivannan Sadhasivam
2020-07-28  2:02 ` [PATCH v6 11/11] bus: mhi: core: Introduce sysfs entries for MHI Bhaumik Bhatt
2020-08-07  5:22   ` Manivannan Sadhasivam
2020-08-10 19:11     ` bbhatt

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