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Add DEFINE_GUARD_ARGS_CLASS() to support these cases by introducing a helper structure to store all arguments for the resource cleanup function. DEFINE_GUARD_ARGS_CLASS(..., _list_class_fields, _list_func_args, _list_arg= s) @_list_class_fields: argument list with types, separated by ';' e.g. (struct device *dev; void *ptr; size_t size; enum dma_data_dir= ection dir; int attr) @_list_func_args: argument list with types, separated by ',' e.g. (struct device *dev, void *ptr, size_t size, enum dma_data_dir= ection dir, int attr) @_list_args: argument list without types, separated by ',' e.g. (dev, ptr, size, dir, attr) Three lists are needed because C syntax differs between struct fields (';'), function parameters (','), and variable arguments (no types). Example usage for dma_map_single(): DEFINE_GUARD_ARGS_CLASS(dma_map_single, dma_addr_t, dma_mapping_error(_T.args.dev, _T.dma_addr), dma_unmap_single(_T->args.dev, _T->ret, _T->args.size, _T->args.dir), dma_map_single, (struct device *dev; void *ptr; size_t size; enum d= ma_data_direction dir), (struct device *dev, void *ptr, size_t size, enum d= ma_data_direction dir), (dev, ptr, size, dir)) Example: fun() { CLASS(dma_map_single, dma)(dev, ...); ... if (error) return -EIO; // dma_unmap_single() will be auto-called } Add retain_and_empty() to keep resource when functions. Example: fun() { CLASS(dma_map_single, dma)(dev, ...); ... if (error) return -EIO; // dma_unmap_single() will be auto-called retain_and_empty(dma); // dma_umap_single() will NOT called. return 0; } Signed-off-by: Frank Li --- There are some checkpatch.pl error, but these is correct and better readablity. ERROR: Macros with complex values should be enclosed in parentheses +#define DEFINE_GUARD_ARGS_CLASS(_name, _return_type, _is_err, _exit, _init= , _list_class_fields, _list_func_args, _list_args) \ +__DEFINE_GUARD_ARGS_CLASS(_name, _return_type, _list_class_fields) = \ +__DEFINE_GUARD_ARGS_ENTRY(_name, _is_err, _init, _list_func_args, _list_ar= gs) \ +__DEFINE_GUARD_ARGS_EXIT(_name, _exit) ERROR: Macros with complex values should be enclosed in parentheses +#define __REMOVE_PAREN(x) __REMOVE_PAREN_HELP x --- include/linux/cleanup.h | 73 +++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 73 insertions(+) diff --git a/include/linux/cleanup.h b/include/linux/cleanup.h index 2573585b7f068abe992af1ac05f478fef7b34306..84b27dd374f2200382b6dc1c450= 320b79406fd87 100644 --- a/include/linux/cleanup.h +++ b/include/linux/cleanup.h @@ -518,4 +518,77 @@ __DEFINE_LOCK_GUARD_0(_name, _lock) =20 #define DEFINE_LOCK_GUARD_1_COND(X...) CONCATENATE(DEFINE_LOCK_GUARD_1_CON= D_, COUNT_ARGS(X))(X) =20 +/* + * Many resource allocation/free function pairs require passing multiple + * arguments =E2=80=94 for example, dma_map_single() and dma_unmap_single() + * + * DEFINE_GUARD_ARGS_CLASS(dma_map_single, dma_addr_t, + * dma_mapping_error(_T.args.dev, _T.ret), + * dma_unmap_single(_T->args.dev, _T->ret, _T->args.size, _T->args.di= r), + * dma_map_single, + * (struct device *dev; void *ptr; size_t size; enum dma_data_directi= on dir), + * (struct device *dev, void *ptr, size_t size, enum dma_data_directi= on dir), + * (dev, ptr, size, dir)) + * Example usage: + * + * int fun() { + * CLASS(dma_map_single, dma)(dev, ptr, size, dir); + * if (!dma.okay) + * return -EIO + * ... + * if (condition) + * return -EIO // cleanup will auto unmap + * + * req->dma_addr =3D retain_and_empty(dma); //keep mapping + * return 0; + * } + */ +#define __REMOVE_PAREN_HELP(...) __VA_ARGS__ +#define __REMOVE_PAREN(x) __REMOVE_PAREN_HELP x + +#define __DEFINE_GUARD_ARGS_CLASS(_name, _return_type, _list_class_fields)= \ +typedef struct { \ + _return_type ret; \ + bool okay; \ + struct { \ + __REMOVE_PAREN(_list_class_fields); \ + } args; \ +} class_##_name##_t; + +#define __DEFINE_GUARD_ARGS_EXIT(_name, _exit) \ +static inline void class_##_name##_destructor(class_##_name##_t *_T) \ +{ if (_T->okay) { _exit; } } + +#define __DEFINE_GUARD_ARGS_ENTRY(_name, _is_err, _init, _list_func_args, = _list__args) \ +static inline class_##_name##_t class_##_name##_constructor(__REMOVE_PAREN= (_list_func_args)) \ +{ \ + class_##_name##_t _T =3D { .args =3D { __REMOVE_PAREN(_list__args) } }; \ + _T.ret =3D _init _list__args; \ + _T.okay =3D !(_is_err); \ + return _T; \ +} + +/** + * @_name: class name + * @_return_type: return data type + * @_is_err: macro to check init function return value + * @_exit: macro to do resource clean up + * @_init: macro/func name to alloc resource + * @_list_class_fields: (args list with type, use ; as split) + * @_list_func_args: (args list with type, use , as split) + * @_list_args: (args list without type, use , as split) + */ +#define DEFINE_GUARD_ARGS_CLASS(_name, _return_type, _is_err, _exit, _init= , _list_class_fields, _list_func_args, _list_args) \ +__DEFINE_GUARD_ARGS_CLASS(_name, _return_type, _list_class_fields) = \ +__DEFINE_GUARD_ARGS_ENTRY(_name, _is_err, _init, _list_func_args, _list_ar= gs) \ +__DEFINE_GUARD_ARGS_EXIT(_name, _exit) + +#define retain_and_empty(t) \ + ({ \ + __auto_type __ptr =3D &(t); 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... if (error) return -EIO; // dma_unmap_single() will be auto-called } Signed-off-by: Frank Li --- include/linux/dma-mapping.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 8248ff9363eed2ae5dc18e9eedb711b299201bea..89fc80e7cd85ba5a4068c61f58f= 3a578ab0a7a01 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -757,4 +757,12 @@ static inline int dma_mmap_wc(struct device *dev, do { typeof(PTR) __p __maybe_unused =3D PTR; } while (0) #endif =20 +DEFINE_GUARD_ARGS_CLASS(dma_map_single, dma_addr_t, + dma_mapping_error(_T.args.dev, _T.ret), + dma_unmap_single(_T->args.dev, _T->ret, _T->args.size, _T->args.dir), + dma_map_single, + (struct device *dev; void *ptr; size_t size; enum dma_data_direction di= r), + (struct device *dev, void *ptr, size_t size, enum dma_data_direction di= r), + (dev, ptr, size, dir)) + #endif /* _LINUX_DMA_MAPPING_H */ --=20 2.34.1 From nobody Fri Dec 19 12:13:30 2025 Received: from MRWPR03CU001.outbound.protection.outlook.com (mail-francesouthazon11011055.outbound.protection.outlook.com [40.107.130.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D5ED5301483; 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Signed-off-by: Frank Li --- Demostrate to how to use auto cleanup for dma map functiongs. It will simple more if need map multi buffers at a functions. --- drivers/i2c/busses/i2c-imx-lpi2c.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-im= x-lpi2c.c index 03b5a7e8c361abe1d75fb4d31f9614bbc6387d93..2c89d441ab1b3e607b8a2b0a658= 9e5909fa39ef4 100644 --- a/drivers/i2c/busses/i2c-imx-lpi2c.c +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c @@ -727,9 +727,11 @@ static int lpi2c_dma_rx_cmd_submit(struct lpi2c_imx_st= ruct *lpi2c_imx) struct dma_chan *txchan =3D dma->chan_tx; dma_cookie_t cookie; =20 - dma->dma_tx_addr =3D dma_map_single(txchan->device->dev, - dma->rx_cmd_buf, dma->rx_cmd_buf_len, - DMA_TO_DEVICE); + CLASS(dma_map_single, dma_addr)(txchan->device->dev, + dma->rx_cmd_buf, dma->rx_cmd_buf_len, + DMA_TO_DEVICE); + dma->dma_tx_addr =3D dma_addr.ret; + if (dma_mapping_error(txchan->device->dev, dma->dma_tx_addr)) { dev_err(&lpi2c_imx->adapter.dev, "DMA map failed, use pio\n"); return -EINVAL; @@ -749,18 +751,15 @@ static int lpi2c_dma_rx_cmd_submit(struct lpi2c_imx_s= truct *lpi2c_imx) goto submit_err_exit; } =20 + retain_and_empty(dma_addr); dma_async_issue_pending(txchan); =20 return 0; =20 desc_prepare_err_exit: - dma_unmap_single(txchan->device->dev, dma->dma_tx_addr, - dma->rx_cmd_buf_len, DMA_TO_DEVICE); return -EINVAL; =20 submit_err_exit: - dma_unmap_single(txchan->device->dev, dma->dma_tx_addr, - dma->rx_cmd_buf_len, DMA_TO_DEVICE); dmaengine_desc_free(rx_cmd_desc); return -EINVAL; } --=20 2.34.1