Re: [PATCH v2 14/36] platform/x86: intel_scu_ipc: Introduce new SCU IPC API

From: Andy Shevchenko
Date: Thu Jan 09 2020 - 06:30:24 EST

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In reply to: Mika Westerberg: "[PATCH v2 14/36] platform/x86: intel_scu_ipc: Introduce new SCU IPC API"
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On Wed, Jan 08, 2020 at 02:41:39PM +0300, Mika Westerberg wrote:
> The current SCU IPC API has been operating on a single instance and
> there has been no way to pin the providing module in place when the SCU
> IPC is in use.
>
> This implements a new API that takes the SCU IPC instance as first
> parameter (NULL means the single instance is being used). The SCU IPC
> instance can be retrieved by calling new function
> intel_scu_ipc_dev_get() that take care of pinning the providing module
> in place as long as intel_scu_ipc_dev_put() is not called.
>
> The old API is left there to support existing users which cannot be
> converted easily but it is put to a separate header that is subject to
> be removed eventually. Subsequent patches will convert most of the users
> to the new API.

Few minor comments below. After addressing them,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>

>
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> ---
> arch/x86/include/asm/intel_scu_ipc.h | 74 +++----
> arch/x86/include/asm/intel_scu_ipc_legacy.h | 76 +++++++
> drivers/platform/x86/intel_scu_ipc.c | 228 +++++++++++++++-----
> drivers/platform/x86/intel_scu_pcidrv.c | 7 +-
> 4 files changed, 291 insertions(+), 94 deletions(-)
> create mode 100644 arch/x86/include/asm/intel_scu_ipc_legacy.h
>
> diff --git a/arch/x86/include/asm/intel_scu_ipc.h b/arch/x86/include/asm/intel_scu_ipc.h
> index 405c47bf0965..9895b60386c5 100644
> --- a/arch/x86/include/asm/intel_scu_ipc.h
> +++ b/arch/x86/include/asm/intel_scu_ipc.h
> @@ -1,8 +1,6 @@
> /* SPDX-License-Identifier: GPL-2.0 */
> #ifndef _ASM_X86_INTEL_SCU_IPC_H_
> -#define _ASM_X86_INTEL_SCU_IPC_H_
> -
> -#include <linux/notifier.h>
> +#define _ASM_X86_INTEL_SCU_IPC_H_
>
> #define IPCMSG_INDIRECT_READ 0x02
> #define IPCMSG_INDIRECT_WRITE 0x05
> @@ -20,6 +18,7 @@
> #define IPC_CMD_VRTC_SETALARM 2 /* Set alarm */
>
> struct device;
> +struct intel_scu_ipc_dev;
>
> /**
> * struct intel_scu_ipc_pdata - Platform data for SCU IPC
> @@ -31,47 +30,38 @@ struct intel_scu_ipc_pdata {
> int irq;
> };
>
> -int intel_scu_ipc_probe(struct device *dev,
> - const struct intel_scu_ipc_pdata *pdata);
> -
> -/* Read single register */
> -int intel_scu_ipc_ioread8(u16 addr, u8 *data);
> -
> -/* Read a vector */
> -int intel_scu_ipc_readv(u16 *addr, u8 *data, int len);
> -
> -/* Write single register */
> -int intel_scu_ipc_iowrite8(u16 addr, u8 data);
> -
> -/* Write a vector */
> -int intel_scu_ipc_writev(u16 *addr, u8 *data, int len);
> -
> -/* Update single register based on the mask */
> -int intel_scu_ipc_update_register(u16 addr, u8 data, u8 mask);
> -
> -/* Issue commands to the SCU with or without data */
> -int intel_scu_ipc_simple_command(int cmd, int sub);
> -int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
> - u32 *out, int outlen);
> -
> -extern struct blocking_notifier_head intel_scu_notifier;
> -
> -static inline void intel_scu_notifier_add(struct notifier_block *nb)
> -{
> - blocking_notifier_chain_register(&intel_scu_notifier, nb);
> -}
> -
> -static inline void intel_scu_notifier_remove(struct notifier_block *nb)
> -{
> - blocking_notifier_chain_unregister(&intel_scu_notifier, nb);
> -}
> -
> -static inline int intel_scu_notifier_post(unsigned long v, void *p)
> +struct intel_scu_ipc_dev *
> +intel_scu_ipc_probe(struct device *dev, const struct intel_scu_ipc_pdata *pdata);
> +
> +struct intel_scu_ipc_dev *intel_scu_ipc_dev_get(void);
> +void intel_scu_ipc_dev_put(struct intel_scu_ipc_dev *scu);
> +struct intel_scu_ipc_dev *devm_intel_scu_ipc_dev_get(struct device *dev);
> +
> +int intel_scu_ipc_dev_ioread8(struct intel_scu_ipc_dev *scu, u16 addr,
> + u8 *data);
> +int intel_scu_ipc_dev_iowrite8(struct intel_scu_ipc_dev *scu, u16 addr,
> + u8 data);
> +int intel_scu_ipc_dev_readv(struct intel_scu_ipc_dev *scu, u16 *addr,
> + u8 *data, size_t len);
> +int intel_scu_ipc_dev_writev(struct intel_scu_ipc_dev *scu, u16 *addr,
> + u8 *data, size_t len);

+ blank line?

> +int intel_scu_ipc_dev_update(struct intel_scu_ipc_dev *scu, u16 addr, u8 data,
> + u8 mask);

Perhaps move u8 data on the next line to be (slightly) consistent with above.

> +
> +int intel_scu_ipc_dev_simple_command(struct intel_scu_ipc_dev *scu, int cmd,
> + int sub);
> +int intel_scu_ipc_dev_command_with_size(struct intel_scu_ipc_dev *scu, int cmd,
> + int sub, const void *in, size_t inlen,
> + size_t size, void *out, size_t outlen);
> +
> +static inline int intel_scu_ipc_dev_command(struct intel_scu_ipc_dev *scu, int cmd,
> + int sub, const void *in, size_t inlen,
> + void *out, size_t outlen)
> {
> - return blocking_notifier_call_chain(&intel_scu_notifier, v, p);
> + return intel_scu_ipc_dev_command_with_size(scu, cmd, sub, in, inlen,
> + inlen, out, outlen);
> }
>
> -#define SCU_AVAILABLE 1
> -#define SCU_DOWN 2
> +#include <asm/intel_scu_ipc_legacy.h>
>
> #endif
> diff --git a/arch/x86/include/asm/intel_scu_ipc_legacy.h b/arch/x86/include/asm/intel_scu_ipc_legacy.h
> new file mode 100644
> index 000000000000..3399ea8eea48
> --- /dev/null
> +++ b/arch/x86/include/asm/intel_scu_ipc_legacy.h
> @@ -0,0 +1,76 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_X86_INTEL_SCU_IPC_LEGACY_H_
> +#define _ASM_X86_INTEL_SCU_IPC_LEGACY_H_
> +
> +#include <linux/notifier.h>
> +
> +/* Don't call these in new code - they will be removed eventually */
> +
> +/* Read single register */
> +static inline int intel_scu_ipc_ioread8(u16 addr, u8 *data)
> +{
> + return intel_scu_ipc_dev_ioread8(NULL, addr, data);
> +}
> +
> +/* Read a vector */
> +static inline int intel_scu_ipc_readv(u16 *addr, u8 *data, int len)
> +{
> + return intel_scu_ipc_dev_readv(NULL, addr, data, len);
> +}
> +
> +/* Write single register */
> +static inline int intel_scu_ipc_iowrite8(u16 addr, u8 data)
> +{
> + return intel_scu_ipc_dev_iowrite8(NULL, addr, data);
> +}
> +
> +/* Write a vector */
> +static inline int intel_scu_ipc_writev(u16 *addr, u8 *data, int len)
> +{
> + return intel_scu_ipc_dev_writev(NULL, addr, data, len);
> +}
> +
> +/* Update single register based on the mask */
> +static inline int intel_scu_ipc_update_register(u16 addr, u8 data, u8 mask)
> +{
> + return intel_scu_ipc_dev_update(NULL, addr, data, mask);
> +}
> +
> +/* Issue commands to the SCU with or without data */
> +static inline int intel_scu_ipc_simple_command(int cmd, int sub)
> +{
> + return intel_scu_ipc_dev_simple_command(NULL, cmd, sub);
> +}
> +
> +static inline int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
> + u32 *out, int outlen)
> +{
> + /* New API takes both inlen and outlen as bytes so convert here */
> + size_t inbytes = inlen * sizeof(u32);
> + size_t outbytes = outlen * sizeof(u32);
> +
> + return intel_scu_ipc_dev_command_with_size(NULL, cmd, sub, in, inbytes,
> + inlen, out, outbytes);
> +}
> +
> +extern struct blocking_notifier_head intel_scu_notifier;
> +
> +static inline void intel_scu_notifier_add(struct notifier_block *nb)
> +{
> + blocking_notifier_chain_register(&intel_scu_notifier, nb);
> +}
> +
> +static inline void intel_scu_notifier_remove(struct notifier_block *nb)
> +{
> + blocking_notifier_chain_unregister(&intel_scu_notifier, nb);
> +}
> +
> +static inline int intel_scu_notifier_post(unsigned long v, void *p)
> +{
> + return blocking_notifier_call_chain(&intel_scu_notifier, v, p);
> +}
> +
> +#define SCU_AVAILABLE 1
> +#define SCU_DOWN 2
> +
> +#endif
> diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
> index b1ac381bb7dd..cc29f504adcf 100644
> --- a/drivers/platform/x86/intel_scu_ipc.c
> +++ b/drivers/platform/x86/intel_scu_ipc.c
> @@ -19,6 +19,7 @@
> #include <linux/init.h>
> #include <linux/interrupt.h>
> #include <linux/io.h>
> +#include <linux/module.h>
>
> #include <asm/intel_scu_ipc.h>
>
> @@ -77,6 +78,99 @@ static struct intel_scu_ipc_dev ipcdev; /* Only one for now */
>
> static DEFINE_MUTEX(ipclock); /* lock used to prevent multiple call to SCU */
>
> +/**
> + * intel_scu_ipc_dev_get() - Get SCU IPC instance
> + *
> + * The recommended new API takes SCU IPC instance as parameter and this
> + * function can be called by driver to get the instance. This also makes
> + * sure the driver providing the IPC functionality cannot be unloaded
> + * while the caller has the intance.
> + *
> + * Call intel_scu_ipc_dev_put() to release the instance.
> + *
> + * Returns %NULL if SCU IPC is not currently available.
> + */
> +struct intel_scu_ipc_dev *intel_scu_ipc_dev_get(void)
> +{
> + struct intel_scu_ipc_dev *scu = &ipcdev;
> +
> + mutex_lock(&ipclock);
> + if (!scu->dev)
> + goto err_unlock;
> + if (!try_module_get(scu->dev->driver->owner))
> + goto err_unlock;
> + mutex_unlock(&ipclock);
> + return scu;
> +
> +err_unlock:
> + mutex_unlock(&ipclock);
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(intel_scu_ipc_dev_get);
> +
> +/**
> + * intel_scu_ipc_dev_put() - Put SCU IPC instance
> + * @scu: SCU IPC instance
> + *
> + * This function releases the SCU IPC instance retrieved from
> + * intel_scu_ipc_dev_get() and allows the driver providing IPC to be
> + * unloaded.
> + */
> +void intel_scu_ipc_dev_put(struct intel_scu_ipc_dev *scu)
> +{
> + mutex_lock(&ipclock);
> + if (scu->dev)
> + module_put(scu->dev->driver->owner);
> + mutex_unlock(&ipclock);
> +}
> +EXPORT_SYMBOL_GPL(intel_scu_ipc_dev_put);
> +
> +struct intel_scu_ipc_devres {
> + struct intel_scu_ipc_dev *scu;
> +};
> +
> +static void devm_intel_scu_ipc_dev_release(struct device *dev, void *res)
> +{
> + struct intel_scu_ipc_devres *devres = res;
> + struct intel_scu_ipc_dev *scu = devres->scu;
> +
> + intel_scu_ipc_dev_put(scu);
> +}
> +
> +/**
> + * devm_intel_scu_ipc_dev_get() - Allocate managed SCU IPC device
> + * @dev: Device requesting the SCU IPC device
> + *
> + * The recommended new API takes SCU IPC instance as parameter and this
> + * function can be called by driver to get the instance. This also makes
> + * sure the driver providing the IPC functionality cannot be unloaded
> + * while the caller has the intance.
> + *
> + * Returns %NULL if SCU IPC is not currently available.
> + */
> +struct intel_scu_ipc_dev *devm_intel_scu_ipc_dev_get(struct device *dev)
> +{
> + struct intel_scu_ipc_devres *devres;
> + struct intel_scu_ipc_dev *scu;
> +
> + devres = devres_alloc(devm_intel_scu_ipc_dev_release, sizeof(*devres),
> + GFP_KERNEL);
> + if (!devres)
> + return NULL;
> +
> + scu = intel_scu_ipc_dev_get();
> + if (!scu) {
> + devres_free(devres);
> + return NULL;
> + }
> +
> + devres->scu = scu;
> + devres_add(dev, devres);
> +
> + return scu;
> +}
> +EXPORT_SYMBOL_GPL(devm_intel_scu_ipc_dev_get);
> +
> /*
> * Send ipc command
> * Command Register (Write Only):
> @@ -167,15 +261,18 @@ static int intel_scu_ipc_check_status(struct intel_scu_ipc_dev *scu)
> }
>
> /* Read/Write power control(PMIC in Langwell, MSIC in PenWell) registers */
> -static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
> +static int pwr_reg_rdwr(struct intel_scu_ipc_dev *scu, u16 *addr, u8 *data,
> + u32 count, u32 op, u32 id)
> {
> - struct intel_scu_ipc_dev *scu = &ipcdev;
> int nc;
> u32 offset = 0;
> int err;
> u8 cbuf[IPC_WWBUF_SIZE];
> u32 *wbuf = (u32 *)&cbuf;
>
> + if (!scu)
> + scu = &ipcdev;
> +
> memset(cbuf, 0, sizeof(cbuf));
>
> mutex_lock(&ipclock);
> @@ -219,7 +316,8 @@ static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
> }
>
> /**
> - * intel_scu_ipc_ioread8 - read a word via the SCU
> + * intel_scu_ipc_dev_ioread8() - Read a byte via the SCU
> + * @scu: Optional SCU IPC instance
> * @addr: Register on SCU
> * @data: Return pointer for read byte
> *
> @@ -228,14 +326,15 @@ static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
> *
> * This function may sleep.
> */
> -int intel_scu_ipc_ioread8(u16 addr, u8 *data)
> +int intel_scu_ipc_dev_ioread8(struct intel_scu_ipc_dev *scu, u16 addr, u8 *data)
> {
> - return pwr_reg_rdwr(&addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R);
> + return pwr_reg_rdwr(scu, &addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R);
> }
> -EXPORT_SYMBOL(intel_scu_ipc_ioread8);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_ioread8);
>
> /**
> - * intel_scu_ipc_iowrite8 - write a byte via the SCU
> + * intel_scu_ipc_dev_iowrite8() - Write a byte via the SCU
> + * @scu: Optional SCU IPC instance
> * @addr: Register on SCU
> * @data: Byte to write
> *
> @@ -244,14 +343,15 @@ EXPORT_SYMBOL(intel_scu_ipc_ioread8);
> *
> * This function may sleep.
> */
> -int intel_scu_ipc_iowrite8(u16 addr, u8 data)
> +int intel_scu_ipc_dev_iowrite8(struct intel_scu_ipc_dev *scu, u16 addr, u8 data)
> {
> - return pwr_reg_rdwr(&addr, &data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W);
> + return pwr_reg_rdwr(scu, &addr, &data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W);
> }
> -EXPORT_SYMBOL(intel_scu_ipc_iowrite8);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_iowrite8);
>
> /**
> - * intel_scu_ipc_readvv - read a set of registers
> + * intel_scu_ipc_dev_readv() - Read a set of registers
> + * @scu: Optional SCU IPC instance
> * @addr: Register list
> * @data: Bytes to return
> * @len: Length of array
> @@ -263,14 +363,16 @@ EXPORT_SYMBOL(intel_scu_ipc_iowrite8);
> *
> * This function may sleep.
> */
> -int intel_scu_ipc_readv(u16 *addr, u8 *data, int len)
> +int intel_scu_ipc_dev_readv(struct intel_scu_ipc_dev *scu, u16 *addr, u8 *data,
> + size_t len)
> {
> - return pwr_reg_rdwr(addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R);
> + return pwr_reg_rdwr(scu, addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_R);
> }
> -EXPORT_SYMBOL(intel_scu_ipc_readv);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_readv);
>
> /**
> - * intel_scu_ipc_writev - write a set of registers
> + * intel_scu_ipc_dev_writev() - Write a set of registers
> + * @scu: Optional SCU IPC instance
> * @addr: Register list
> * @data: Bytes to write
> * @len: Length of array
> @@ -282,14 +384,16 @@ EXPORT_SYMBOL(intel_scu_ipc_readv);
> *
> * This function may sleep.
> */
> -int intel_scu_ipc_writev(u16 *addr, u8 *data, int len)
> +int intel_scu_ipc_dev_writev(struct intel_scu_ipc_dev *scu, u16 *addr, u8 *data,
> + size_t len)
> {
> - return pwr_reg_rdwr(addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W);
> + return pwr_reg_rdwr(scu, addr, data, len, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_W);
> }
> -EXPORT_SYMBOL(intel_scu_ipc_writev);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_writev);
>
> /**
> - * intel_scu_ipc_update_register - r/m/w a register
> + * intel_scu_ipc_dev_update() - Update a register
> + * @scu: Optional SCU IPC instance
> * @addr: Register address
> * @bits: Bits to update
> * @mask: Mask of bits to update
> @@ -302,15 +406,17 @@ EXPORT_SYMBOL(intel_scu_ipc_writev);
> * This function may sleep. Locking between SCU accesses is handled
> * for the caller.
> */
> -int intel_scu_ipc_update_register(u16 addr, u8 bits, u8 mask)

> +int intel_scu_ipc_dev_update(struct intel_scu_ipc_dev *scu, u16 addr, u8 bits,
> + u8 mask)

In header you have 'u8 data'. Can we be consistent with a name?

> {
> u8 data[2] = { bits, mask };
> - return pwr_reg_rdwr(&addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_M);
> + return pwr_reg_rdwr(scu, &addr, data, 1, IPCMSG_PCNTRL, IPC_CMD_PCNTRL_M);
> }
> -EXPORT_SYMBOL(intel_scu_ipc_update_register);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_update);
>
> /**
> - * intel_scu_ipc_simple_command - send a simple command
> + * intel_scu_ipc_dev_simple_command() - Send a simple command
> + * @scu: Optional SCU IPC instance
> * @cmd: Command
> * @sub: Sub type
> *
> @@ -321,11 +427,14 @@ EXPORT_SYMBOL(intel_scu_ipc_update_register);
> * This function may sleep. Locking for SCU accesses is handled for the
> * caller.
> */
> -int intel_scu_ipc_simple_command(int cmd, int sub)
> +int intel_scu_ipc_dev_simple_command(struct intel_scu_ipc_dev *scu, int cmd,
> + int sub)
> {
> - struct intel_scu_ipc_dev *scu = &ipcdev;
> int err;
>
> + if (!scu)
> + scu = &ipcdev;
> +
> mutex_lock(&ipclock);
> if (scu->dev == NULL) {
> mutex_unlock(&ipclock);
> @@ -336,47 +445,65 @@ int intel_scu_ipc_simple_command(int cmd, int sub)
> mutex_unlock(&ipclock);
> return err;
> }
> -EXPORT_SYMBOL(intel_scu_ipc_simple_command);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_simple_command);
>
> /**
> - * intel_scu_ipc_command - command with data
> + * intel_scu_ipc_command_with_size() - Command with data
> + * @scu: Optional SCU IPC instance
> * @cmd: Command
> * @sub: Sub type
> * @in: Input data
> - * @inlen: Input length in dwords
> + * @inlen: Input length in bytes
> + * @size: Input size written to the IPC command register in whatever
> + * units (dword, byte) the particular firmware requires. Normally
> + * should be the same as @inlen.
> * @out: Output data
> - * @outlen: Output length in dwords
> + * @outlen: Output length in bytes
> *
> * Issue a command to the SCU which involves data transfers. Do the
> * data copies under the lock but leave it for the caller to interpret.
> */
> -int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
> - u32 *out, int outlen)
> +int intel_scu_ipc_dev_command_with_size(struct intel_scu_ipc_dev *scu, int cmd,
> + int sub, const void *in, size_t inlen,
> + size_t size, void *out, size_t outlen)
> {
> - struct intel_scu_ipc_dev *scu = &ipcdev;
> + size_t outbuflen = DIV_ROUND_UP(outlen, sizeof(u32));
> + size_t inbuflen = DIV_ROUND_UP(inlen, sizeof(u32));
> + u32 inbuf[4] = {};
> int i, err;
>
> + if (inbuflen > 4 || outbuflen > 4)
> + return -EINVAL;
> +
> + if (!scu)
> + scu = &ipcdev;
> +
> mutex_lock(&ipclock);
> if (scu->dev == NULL) {
> mutex_unlock(&ipclock);
> return -ENODEV;
> }
>
> - for (i = 0; i < inlen; i++)
> - ipc_data_writel(scu, *in++, 4 * i);
> + memcpy(inbuf, in, inlen);
> + for (i = 0; i < inbuflen; i++)
> + ipc_data_writel(scu, inbuf[i], 4 * i);
>
> - ipc_command(scu, (inlen << 16) | (sub << 12) | cmd);
> + ipc_command(scu, (size << 16) | (sub << 12) | cmd);
> err = intel_scu_ipc_check_status(scu);
>
> - if (!err) {
> - for (i = 0; i < outlen; i++)
> - *out++ = ipc_data_readl(scu, 4 * i);

> + if (!err && outlen) {

Do we need the 'outlen' test here? In any case if it's zero the following
will be no-op.

> + u32 outbuf[4] = {};
> +
> + for (i = 0; i < outbuflen; i++)
> + outbuf[i] = ipc_data_readl(scu, 4 * i);
> +
> + memcpy(out, outbuf, outlen);
> }
>
> mutex_unlock(&ipclock);
> return err;
> }
> -EXPORT_SYMBOL(intel_scu_ipc_command);
> +EXPORT_SYMBOL(intel_scu_ipc_dev_command_with_size);
>
> /*
> * Interrupt handler gets called when ioc bit of IPC_COMMAND_REG set to 1
> @@ -401,20 +528,20 @@ static irqreturn_t ioc(int irq, void *dev_id)
> * @dev: SCU device
> * @pdata: Platform specific data
> *
> - * Call this function to initialize SCU IPC mechanism. It is removed
> - * automatically when the calling driver is unbound from @dev.
> + * Call this function to initialize SCU IPC mechanism. Returns SCU IPC
> + * instance or ERR_PTR() if there was an error. The caller may use the
> + * returned instance if it needs to do SCU IPC calls itself.
> */
> -int intel_scu_ipc_probe(struct device *dev,
> - const struct intel_scu_ipc_pdata *pdata)
> +struct intel_scu_ipc_dev *
> +intel_scu_ipc_probe(struct device *dev, const struct intel_scu_ipc_pdata *pdata)
> {
> - int err;
> struct intel_scu_ipc_dev *scu = &ipcdev;
>
> mutex_lock(&ipclock);
> /* We support only one IPC */
> if (scu->dev) {
> mutex_unlock(&ipclock);
> - return -EBUSY;
> + return ERR_PTR(-EBUSY);
> }
>
> scu->ipc_base = pdata->ipc_regs;
> @@ -422,17 +549,20 @@ int intel_scu_ipc_probe(struct device *dev,
> init_completion(&scu->cmd_complete);
>
> if (scu->irq > 0) {
> + int err;
> +
> err = devm_request_irq(dev, scu->irq, ioc, 0, "intel_scu_ipc",
> scu);
> - if (err)
> - goto unlock;
> + if (err) {
> + mutex_unlock(&ipclock);
> + return ERR_PTR(err);
> + }
> }
>
> /* Assign device at last */
> scu->dev = dev;
>
> -unlock:
> mutex_unlock(&ipclock);
> - return err;
> + return scu;
> }
> EXPORT_SYMBOL_GPL(intel_scu_ipc_probe);
> diff --git a/drivers/platform/x86/intel_scu_pcidrv.c b/drivers/platform/x86/intel_scu_pcidrv.c
> index 47dd4d85bf2a..42030bdb3e08 100644
> --- a/drivers/platform/x86/intel_scu_pcidrv.c
> +++ b/drivers/platform/x86/intel_scu_pcidrv.c
> @@ -18,6 +18,7 @@ static int intel_scu_pci_probe(struct pci_dev *pdev,
> const struct pci_device_id *id)
> {
> struct intel_scu_ipc_pdata *pdata;
> + struct intel_scu_ipc_dev *scu;
> int ret;
>
> pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> @@ -35,9 +36,9 @@ static int intel_scu_pci_probe(struct pci_dev *pdev,
> pdata->ipc_regs = pcim_iomap_table(pdev)[0];
> pdata->irq = pdev->irq;
>
> - ret = intel_scu_ipc_probe(&pdev->dev, pdata);
> - if (ret)
> - return ret;
> + scu = intel_scu_ipc_probe(&pdev->dev, pdata);
> + if (IS_ERR(scu))
> + return PTR_ERR(scu);
>
> intel_scu_devices_create();
> return 0;
> --
> 2.24.1
>

--
With Best Regards,
Andy Shevchenko

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