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[2.15.156.232]) by smtp.gmail.com with ESMTPSA id z25sm26400850wmk.28.2020.06.28.23.50.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 28 Jun 2020 23:50:19 -0700 (PDT) From: Bartosz Golaszewski To: Jonathan Corbet , Greg Kroah-Hartman , "Rafael J . Wysocki" , Guenter Roeck , Jean Delvare Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 5/6] devres: provide devm_krealloc() Date: Mon, 29 Jun 2020 08:50:07 +0200 Message-Id: <20200629065008.27620-6-brgl@bgdev.pl> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200629065008.27620-1-brgl@bgdev.pl> References: <20200629065008.27620-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Bartosz Golaszewski Implement the managed variant of krealloc(). This function works with all memory allocated by devm_kmalloc() (or devres functions using it implicitly like devm_kmemdup(), devm_kstrdup() etc.). Managed realloc'ed chunks can be manually released with devm_kfree(). Signed-off-by: Bartosz Golaszewski --- .../driver-api/driver-model/devres.rst | 1 + drivers/base/devres.c | 50 +++++++++++++++++++ include/linux/device.h | 2 + 3 files changed, 53 insertions(+) diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index e0b58c392e4f..0a2572c3813c 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -352,6 +352,7 @@ MEM devm_kfree() devm_kmalloc() devm_kmalloc_array() + devm_krealloc() devm_kmemdup() devm_kstrdup() devm_kvasprintf() diff --git a/drivers/base/devres.c b/drivers/base/devres.c index ed615d3b9cf1..4b8870ef6a3f 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -837,6 +837,56 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) } EXPORT_SYMBOL_GPL(devm_kmalloc); +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp) +{ + struct devres *old_dr, *new_dr; + struct list_head old_head; + unsigned long flags; + void *ret = NULL; + size_t tot_size; + + if (unlikely(!new_size)) { + devm_kfree(dev, ptr); + return ZERO_SIZE_PTR; + } + + if (unlikely(ZERO_OR_NULL_PTR(ptr))) + return devm_kmalloc(dev, new_size, gfp); + + if (WARN_ON(is_kernel_rodata((unsigned long)ptr))) + /* + * We cannot reliably realloc a const string returned by + * devm_kstrdup_const(). + */ + return NULL; + + if (!check_dr_size(new_size, &tot_size)) + return NULL; + + spin_lock_irqsave(&dev->devres_lock, flags); + + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr); + if (WARN_ON(!old_dr)) + /* Memory chunk not managed or managed by a different device. */ + goto out; + + old_head = old_dr->node.entry; + + new_dr = krealloc(old_dr, tot_size, gfp); + if (!new_dr) + goto out; + + if (new_dr != old_dr) + list_replace(&old_head, &new_dr->node.entry); + + ret = new_dr->data; + +out: + spin_unlock_irqrestore(&dev->devres_lock, flags); + return ret; +} +EXPORT_SYMBOL_GPL(devm_krealloc); + /** * devm_kstrdup - Allocate resource managed space and * copy an existing string into that. diff --git a/include/linux/device.h b/include/linux/device.h index 9cadb647cacc..228063c6392c 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -201,6 +201,8 @@ int devres_release_group(struct device *dev, void *id); /* managed devm_k.alloc/kfree for device drivers */ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc; +void *devm_krealloc(struct device *dev, void *ptr, size_t size, + gfp_t gfp) __must_check; __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt, va_list ap) __malloc; __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp, -- 2.26.1