From: Vivek Gautam <vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> To: joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: mark.rutland-5wv7dgnIgG8@public.gmane.org, "Rafael J . Wysocki" <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>, linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org> Subject: [PATCH v9 1/5] driver core: Find an existing link between two devices Date: Tue, 13 Mar 2018 14:25:30 +0530 [thread overview] Message-ID: <20180313085534.11650-2-vivek.gautam@codeaurora.org> (raw) In-Reply-To: <20180313085534.11650-1-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> The lists managing the device-links can be traversed to find the link between two devices. The device_link_add() APIs does traverse these lists to check if there's already a link setup between the two devices. So, add a new APIs, device_link_find(), to find an existing device link between two devices - suppliers and consumers. Signed-off-by: Vivek Gautam <vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> Cc: Rafael J. Wysocki <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org> Cc: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org> --- * New patch added to this series. drivers/base/core.c | 30 +++++++++++++++++++++++++++--- include/linux/device.h | 2 ++ 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 5847364f25d9..e8c9774e4ba2 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -144,6 +144,30 @@ static int device_reorder_to_tail(struct device *dev, void *not_used) return 0; } +/** + * device_link_find - find any existing link between two devices. + * @consumer: Consumer end of the link. + * @supplier: Supplier end of the link. + * + * Returns pointer to the existing link between a supplier and + * and consumer devices, or NULL if no link exists. + */ +struct device_link *device_link_find(struct device *consumer, + struct device *supplier) +{ + struct device_link *link = NULL; + + if (!consumer || !supplier) + return NULL; + + list_for_each_entry(link, &supplier->links.consumers, s_node) + if (link->consumer == consumer) + break; + + return link; +} +EXPORT_SYMBOL_GPL(device_link_find); + /** * device_link_add - Create a link between two devices. * @consumer: Consumer end of the link. @@ -195,9 +219,9 @@ struct device_link *device_link_add(struct device *consumer, goto out; } - list_for_each_entry(link, &supplier->links.consumers, s_node) - if (link->consumer == consumer) - goto out; + link = device_link_find(consumer, supplier); + if (link) + goto out; link = kzalloc(sizeof(*link), GFP_KERNEL); if (!link) diff --git a/include/linux/device.h b/include/linux/device.h index b093405ed525..13bc1884c3eb 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1278,6 +1278,8 @@ extern const char *dev_driver_string(const struct device *dev); struct device_link *device_link_add(struct device *consumer, struct device *supplier, u32 flags); void device_link_del(struct device_link *link); +struct device_link *device_link_find(struct device *consumer, + struct device *supplier); #ifdef CONFIG_PRINTK -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
WARNING: multiple messages have this Message-ID (diff)
From: Vivek Gautam <vivek.gautam@codeaurora.org> To: joro@8bytes.org, robh+dt@kernel.org, robin.murphy@arm.com, iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: mark.rutland@arm.com, will.deacon@arm.com, robdclark@gmail.com, tfiga@chromium.org, sricharan@codeaurora.org, m.szyprowski@samsung.com, architt@codeaurora.org, linux-arm-msm@vger.kernel.org, vivek.gautam@codeaurora.org, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Greg Kroah-Hartman <gregkh@linuxfoundation.org> Subject: [PATCH v9 1/5] driver core: Find an existing link between two devices Date: Tue, 13 Mar 2018 14:25:30 +0530 [thread overview] Message-ID: <20180313085534.11650-2-vivek.gautam@codeaurora.org> (raw) In-Reply-To: <20180313085534.11650-1-vivek.gautam@codeaurora.org> The lists managing the device-links can be traversed to find the link between two devices. The device_link_add() APIs does traverse these lists to check if there's already a link setup between the two devices. So, add a new APIs, device_link_find(), to find an existing device link between two devices - suppliers and consumers. Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- * New patch added to this series. drivers/base/core.c | 30 +++++++++++++++++++++++++++--- include/linux/device.h | 2 ++ 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 5847364f25d9..e8c9774e4ba2 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -144,6 +144,30 @@ static int device_reorder_to_tail(struct device *dev, void *not_used) return 0; } +/** + * device_link_find - find any existing link between two devices. + * @consumer: Consumer end of the link. + * @supplier: Supplier end of the link. + * + * Returns pointer to the existing link between a supplier and + * and consumer devices, or NULL if no link exists. + */ +struct device_link *device_link_find(struct device *consumer, + struct device *supplier) +{ + struct device_link *link = NULL; + + if (!consumer || !supplier) + return NULL; + + list_for_each_entry(link, &supplier->links.consumers, s_node) + if (link->consumer == consumer) + break; + + return link; +} +EXPORT_SYMBOL_GPL(device_link_find); + /** * device_link_add - Create a link between two devices. * @consumer: Consumer end of the link. @@ -195,9 +219,9 @@ struct device_link *device_link_add(struct device *consumer, goto out; } - list_for_each_entry(link, &supplier->links.consumers, s_node) - if (link->consumer == consumer) - goto out; + link = device_link_find(consumer, supplier); + if (link) + goto out; link = kzalloc(sizeof(*link), GFP_KERNEL); if (!link) diff --git a/include/linux/device.h b/include/linux/device.h index b093405ed525..13bc1884c3eb 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1278,6 +1278,8 @@ extern const char *dev_driver_string(const struct device *dev); struct device_link *device_link_add(struct device *consumer, struct device *supplier, u32 flags); void device_link_del(struct device_link *link); +struct device_link *device_link_find(struct device *consumer, + struct device *supplier); #ifdef CONFIG_PRINTK -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2018-03-13 8:55 UTC|newest] Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-03-13 8:55 [PATCH v9 0/5] iommu/arm-smmu: Add runtime pm/sleep support Vivek Gautam 2018-03-13 8:55 ` Vivek Gautam [not found] ` <20180313085534.11650-1-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2018-03-13 8:55 ` Vivek Gautam [this message] 2018-03-13 8:55 ` [PATCH v9 1/5] driver core: Find an existing link between two devices Vivek Gautam 2018-03-13 9:40 ` Rafael J. Wysocki [not found] ` <8903307.QazHKW0JrR-yvgW3jdyMHm1GS7QM15AGw@public.gmane.org> 2018-03-13 9:55 ` Vivek Gautam 2018-03-13 9:55 ` Vivek Gautam [not found] ` <CAFp+6iE=0PD6fZZVd+bC1Z95Lkt=X-F4YOXz8EtdiXL=jsC1RA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-03-13 12:49 ` Robin Murphy 2018-03-13 12:49 ` Robin Murphy [not found] ` <4eaf2006-ea68-d9e9-a0db-89acec0ea299-5wv7dgnIgG8@public.gmane.org> 2018-03-13 14:39 ` Vivek Gautam 2018-03-13 14:39 ` Vivek Gautam [not found] ` <20180313085534.11650-2-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2018-03-13 9:58 ` Vivek Gautam 2018-03-13 9:58 ` Vivek Gautam 2018-03-13 10:15 ` Tomasz Figa [not found] ` <CAAFQd5DXvnjaFw4Ct1Xn90nQZ4F4dLtov0ymG-tycQt5oLNpiQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-03-13 10:34 ` Vivek Gautam 2018-03-13 10:34 ` Vivek Gautam 2018-03-13 11:23 ` Tomasz Figa [not found] ` <CAAFQd5A5Rj1KAZjUc5ZUKuKnbkA5Q6aLw9z0H3_kfyBQOOF-gw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-03-14 11:12 ` Rafael J. Wysocki 2018-03-14 11:12 ` Rafael J. Wysocki [not found] ` <2217404.A2W3Iek6du-yvgW3jdyMHm1GS7QM15AGw@public.gmane.org> 2018-03-14 11:50 ` Tomasz Figa 2018-03-14 11:50 ` Tomasz Figa [not found] ` <CAAFQd5CQXY0Efv+2MC1kTVW5q4eZjJ=gwVaR-LA=3agnSSHzUw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-03-14 11:57 ` Rafael J. Wysocki 2018-03-14 11:57 ` Rafael J. Wysocki [not found] ` <2705105.V6KYPvoJqj-yvgW3jdyMHm1GS7QM15AGw@public.gmane.org> 2018-03-14 12:14 ` Robin Murphy 2018-03-14 12:14 ` Robin Murphy 2018-03-14 12:27 ` Lukas Wunner [not found] ` <20180314122759.GB19651-JFq808J9C/izQB+pC5nmwQ@public.gmane.org> 2018-03-20 7:56 ` Vivek Gautam 2018-03-20 7:56 ` Vivek Gautam 2018-03-14 12:23 ` Lukas Wunner 2018-03-13 8:55 ` [PATCH v9 2/5] iommu/arm-smmu: Add pm_runtime/sleep ops Vivek Gautam 2018-03-13 8:55 ` Vivek Gautam 2018-03-13 8:55 ` [PATCH v9 3/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam 2018-03-13 8:55 ` Vivek Gautam [not found] ` <20180313085534.11650-4-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2018-03-14 17:46 ` Robin Murphy 2018-03-14 17:46 ` Robin Murphy [not found] ` <77ed3675-0af0-b36a-5f76-b920d7a4c8e0-5wv7dgnIgG8@public.gmane.org> 2018-03-15 7:17 ` Tomasz Figa 2018-03-15 7:17 ` Tomasz Figa 2018-03-20 9:49 ` Vivek Gautam 2018-03-20 9:49 ` Vivek Gautam 2018-03-13 8:55 ` [PATCH v9 4/5] iommu/arm-smmu: Add the device_link between masters and smmu Vivek Gautam 2018-03-13 8:55 ` Vivek Gautam [not found] ` <20180313085534.11650-5-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2018-03-14 17:50 ` Robin Murphy 2018-03-14 17:50 ` Robin Murphy [not found] ` <8b427ea2-5c13-4712-13d1-e4c1aed0779e-5wv7dgnIgG8@public.gmane.org> 2018-03-15 6:18 ` Tomasz Figa 2018-03-15 6:18 ` Tomasz Figa [not found] ` <CAAFQd5AqERQMLsJNLAsVXox79kZ+ZtpCUuMSutn70FGK-3Q7vw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-03-15 10:44 ` Robin Murphy 2018-03-15 10:44 ` Robin Murphy 2018-03-15 8:57 ` Vivek Gautam 2018-03-15 8:57 ` Vivek Gautam [not found] ` <CAFp+6iEFDXKdS_mTgrrpCX2isMAT3XJifRV0FYxV+PFpVGV=2w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-03-15 11:12 ` Robin Murphy 2018-03-15 11:12 ` Robin Murphy 2018-03-13 8:55 ` [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Vivek Gautam 2018-03-13 8:55 ` Vivek Gautam [not found] ` <61d30fff-1bf8-d2c1-bbe9-f93de836ae77@huawei.com> [not found] ` <7d5af071-ef98-8461-3ce9-e84fc0b3956a@codeaurora.org> [not found] ` <7d5af071-ef98-8461-3ce9-e84fc0b3956a-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2018-03-28 6:11 ` Yisheng Xie 2018-03-28 6:11 ` Yisheng Xie [not found] ` <d97872fe-5e8e-cc27-e385-64cea8ea2458-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> 2018-04-10 13:14 ` [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom, smmu-v2 variant Tomasz Figa 2018-04-10 13:14 ` [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Tomasz Figa [not found] ` <CAAFQd5Cj3qaqt8ACabZwN4ZKaNbF9N9suGVaOKD8-kNxgfeeVA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2018-04-11 1:22 ` Yisheng Xie 2018-04-11 1:22 ` Yisheng Xie [not found] ` <65a57964-805b-3a38-71a2-0c383af30539-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> 2018-04-11 5:15 ` Vivek Gautam 2018-04-11 5:15 ` Vivek Gautam [not found] ` <ff1c730f-0009-58e5-cf4a-45fe9ab93d1e-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> 2018-04-12 1:55 ` Yisheng Xie 2018-04-12 1:55 ` Yisheng Xie
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