diff --git a/Documentation/driver-api/fpga/fpga-bridge.rst b/Documentation/driver-api/fpga/fpga-bridge.rst index 2c2aaca894bf4aefdfe67500338aa1253533cb14..ebbcbde687b36d98580b5e5b8ded373e6ac5f1f9 100644 --- a/Documentation/driver-api/fpga/fpga-bridge.rst +++ b/Documentation/driver-api/fpga/fpga-bridge.rst @@ -10,6 +10,9 @@ API to implement a new FPGA bridge .. kernel-doc:: include/linux/fpga/fpga-bridge.h :functions: fpga_bridge_ops +.. kernel-doc:: drivers/fpga/fpga-bridge.c + :functions: devm_fpga_bridge_create + .. kernel-doc:: drivers/fpga/fpga-bridge.c :functions: fpga_bridge_create diff --git a/drivers/fpga/altera-fpga2sdram.c b/drivers/fpga/altera-fpga2sdram.c index 23660ccd634b13ba5cdc62ef6d82c6fe6b3cd780..a78e49c63c640d3fb8313d6015bd6af9f0607e80 100644 --- a/drivers/fpga/altera-fpga2sdram.c +++ b/drivers/fpga/altera-fpga2sdram.c @@ -121,18 +121,16 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) /* Get f2s bridge configuration saved in handoff register */ regmap_read(sysmgr, SYSMGR_ISWGRP_HANDOFF3, &priv->mask); - br = fpga_bridge_create(dev, F2S_BRIDGE_NAME, - &altera_fpga2sdram_br_ops, priv); + br = devm_fpga_bridge_create(dev, F2S_BRIDGE_NAME, + &altera_fpga2sdram_br_ops, priv); if (!br) return -ENOMEM; platform_set_drvdata(pdev, br); ret = fpga_bridge_register(br); - if (ret) { - fpga_bridge_free(br); + if (ret) return ret; - } dev_info(dev, "driver initialized with handoff %08x\n", priv->mask); diff --git a/drivers/fpga/altera-freeze-bridge.c b/drivers/fpga/altera-freeze-bridge.c index ffd586c48ecff3ebbcd8964c332d07b60b059cdd..dd58c4aea92ea6c7c33ea70c628d1642c28d4df7 100644 --- a/drivers/fpga/altera-freeze-bridge.c +++ b/drivers/fpga/altera-freeze-bridge.c @@ -213,7 +213,6 @@ static int altera_freeze_br_probe(struct platform_device *pdev) struct fpga_bridge *br; struct resource *res; u32 status, revision; - int ret; if (!np) return -ENODEV; @@ -245,20 +244,14 @@ static int altera_freeze_br_probe(struct platform_device *pdev) priv->base_addr = base_addr; - br = fpga_bridge_create(dev, FREEZE_BRIDGE_NAME, - &altera_freeze_br_br_ops, priv); + br = devm_fpga_bridge_create(dev, FREEZE_BRIDGE_NAME, + &altera_freeze_br_br_ops, priv); if (!br) return -ENOMEM; platform_set_drvdata(pdev, br); - ret = fpga_bridge_register(br); - if (ret) { - fpga_bridge_free(br); - return ret; - } - - return 0; + return fpga_bridge_register(br); } static int altera_freeze_br_remove(struct platform_device *pdev) diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c index a974d3f60321007443296ff83f52e7e4e23d6c7a..77b95f2518216863bdba6c80c38e329c51912cc5 100644 --- a/drivers/fpga/altera-hps2fpga.c +++ b/drivers/fpga/altera-hps2fpga.c @@ -180,7 +180,8 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) } } - br = fpga_bridge_create(dev, priv->name, &altera_hps2fpga_br_ops, priv); + br = devm_fpga_bridge_create(dev, priv->name, + &altera_hps2fpga_br_ops, priv); if (!br) { ret = -ENOMEM; goto err; @@ -190,12 +191,10 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) ret = fpga_bridge_register(br); if (ret) - goto err_free; + goto err; return 0; -err_free: - fpga_bridge_free(br); err: clk_disable_unprepare(priv->clk); diff --git a/drivers/fpga/dfl-fme-br.c b/drivers/fpga/dfl-fme-br.c index 7cc041def8b3c5d3140715f51cd4deb4ed023e0f..3ff9f3a687ce52b3399b5c06ce4a1b91eec52621 100644 --- a/drivers/fpga/dfl-fme-br.c +++ b/drivers/fpga/dfl-fme-br.c @@ -61,7 +61,6 @@ static int fme_br_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct fme_br_priv *priv; struct fpga_bridge *br; - int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -69,18 +68,14 @@ static int fme_br_probe(struct platform_device *pdev) priv->pdata = dev_get_platdata(dev); - br = fpga_bridge_create(dev, "DFL FPGA FME Bridge", - &fme_bridge_ops, priv); + br = devm_fpga_bridge_create(dev, "DFL FPGA FME Bridge", + &fme_bridge_ops, priv); if (!br) return -ENOMEM; platform_set_drvdata(pdev, br); - ret = fpga_bridge_register(br); - if (ret) - fpga_bridge_free(br); - - return ret; + return fpga_bridge_register(br); } static int fme_br_remove(struct platform_device *pdev) diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c index c983dac97501b910e020996d53ec04609d99a265..80bd8f1b2aa60fc06b8f132898105fab9c14c939 100644 --- a/drivers/fpga/fpga-bridge.c +++ b/drivers/fpga/fpga-bridge.c @@ -324,6 +324,9 @@ ATTRIBUTE_GROUPS(fpga_bridge); * @br_ops: pointer to structure of fpga bridge ops * @priv: FPGA bridge private data * + * The caller of this function is responsible for freeing the bridge with + * fpga_bridge_free(). Using devm_fpga_bridge_create() instead is recommended. + * * Return: struct fpga_bridge or NULL */ struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name, @@ -378,8 +381,8 @@ struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name, EXPORT_SYMBOL_GPL(fpga_bridge_create); /** - * fpga_bridge_free - free a fpga bridge and its id - * @bridge: FPGA bridge struct created by fpga_bridge_create + * fpga_bridge_free - free a fpga bridge created by fpga_bridge_create() + * @bridge: FPGA bridge struct */ void fpga_bridge_free(struct fpga_bridge *bridge) { @@ -388,9 +391,56 @@ void fpga_bridge_free(struct fpga_bridge *bridge) } EXPORT_SYMBOL_GPL(fpga_bridge_free); +static void devm_fpga_bridge_release(struct device *dev, void *res) +{ + struct fpga_bridge *bridge = *(struct fpga_bridge **)res; + + fpga_bridge_free(bridge); +} + /** - * fpga_bridge_register - register a fpga bridge - * @bridge: FPGA bridge struct created by fpga_bridge_create + * devm_fpga_bridge_create - create and init a managed struct fpga_bridge + * @dev: FPGA bridge device from pdev + * @name: FPGA bridge name + * @br_ops: pointer to structure of fpga bridge ops + * @priv: FPGA bridge private data + * + * This function is intended for use in a FPGA bridge driver's probe function. + * After the bridge driver creates the struct with devm_fpga_bridge_create(), it + * should register the bridge with fpga_bridge_register(). The bridge driver's + * remove function should call fpga_bridge_unregister(). The bridge struct + * allocated with this function will be freed automatically on driver detach. + * This includes the case of a probe function returning error before calling + * fpga_bridge_register(), the struct will still get cleaned up. + * + * Return: struct fpga_bridge or NULL + */ +struct fpga_bridge +*devm_fpga_bridge_create(struct device *dev, const char *name, + const struct fpga_bridge_ops *br_ops, void *priv) +{ + struct fpga_bridge **ptr, *bridge; + + ptr = devres_alloc(devm_fpga_bridge_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return NULL; + + bridge = fpga_bridge_create(dev, name, br_ops, priv); + if (!bridge) { + devres_free(ptr); + } else { + *ptr = bridge; + devres_add(dev, ptr); + } + + return bridge; +} +EXPORT_SYMBOL_GPL(devm_fpga_bridge_create); + +/** + * fpga_bridge_register - register a FPGA bridge + * + * @bridge: FPGA bridge struct * * Return: 0 for success, error code otherwise. */ @@ -412,8 +462,11 @@ int fpga_bridge_register(struct fpga_bridge *bridge) EXPORT_SYMBOL_GPL(fpga_bridge_register); /** - * fpga_bridge_unregister - unregister and free a fpga bridge - * @bridge: FPGA bridge struct created by fpga_bridge_create + * fpga_bridge_unregister - unregister a FPGA bridge + * + * @bridge: FPGA bridge struct + * + * This function is intended for use in a FPGA bridge driver's remove function. */ void fpga_bridge_unregister(struct fpga_bridge *bridge) { @@ -430,9 +483,6 @@ EXPORT_SYMBOL_GPL(fpga_bridge_unregister); static void fpga_bridge_dev_release(struct device *dev) { - struct fpga_bridge *bridge = to_fpga_bridge(dev); - - fpga_bridge_free(bridge); } static int __init fpga_bridge_dev_init(void) diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c index 07ba1539e82c815b12a185026a22385a9bd2a85f..6410361352079717f123ee6f6b1a52f15d39b12e 100644 --- a/drivers/fpga/xilinx-pr-decoupler.c +++ b/drivers/fpga/xilinx-pr-decoupler.c @@ -121,8 +121,8 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev) clk_disable(priv->clk); - br = fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler", - &xlnx_pr_decoupler_br_ops, priv); + br = devm_fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler", + &xlnx_pr_decoupler_br_ops, priv); if (!br) { err = -ENOMEM; goto err_clk; diff --git a/include/linux/fpga/fpga-bridge.h b/include/linux/fpga/fpga-bridge.h index ce550fcf6360ded6dde4f795330109ca6134ccad..817600a32c935568fd9ffdbbcb13dd392b5ba3e2 100644 --- a/include/linux/fpga/fpga-bridge.h +++ b/include/linux/fpga/fpga-bridge.h @@ -69,4 +69,8 @@ void fpga_bridge_free(struct fpga_bridge *br); int fpga_bridge_register(struct fpga_bridge *br); void fpga_bridge_unregister(struct fpga_bridge *br); +struct fpga_bridge +*devm_fpga_bridge_create(struct device *dev, const char *name, + const struct fpga_bridge_ops *br_ops, void *priv); + #endif /* _LINUX_FPGA_BRIDGE_H */