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From:   Jean-Jacques Hiblot <jjhiblot@traphandler.com>
To:     <lee@kernel.org>, <pavel@ucw.cz>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>
CC:     <linux-leds@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        Jean-Jacques Hiblot <jjhiblot@traphandler.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: [PATCH v10 1/5] devres: provide devm_krealloc_array()
Date:   Sat, 24 Jun 2023 10:42:13 +0200
Message-ID: <20230624084217.3079205-2-jjhiblot@traphandler.com>
In-Reply-To: <20230624084217.3079205-1-jjhiblot@traphandler.com>
References: <20230624084217.3079205-1-jjhiblot@traphandler.com>
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Precedence: bulk

Implement the managed variant of krealloc_array().
This internally uses devm_krealloc() and as such is usable 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: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 include/linux/device.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 472dd24d4823..e45dc78068b7 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -223,6 +223,19 @@ static inline void *devm_kcalloc(struct device *dev,
 {
 	return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
 }
+static inline void *devm_krealloc_array(struct device *dev,
+					void *p,
+					size_t new_n,
+					size_t new_size,
+					gfp_t flags)
+{
+	size_t bytes;
+
+	if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
+		return NULL;
+
+	return devm_krealloc(dev, p, bytes, flags);
+}
 void devm_kfree(struct device *dev, const void *p);
 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
 const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
-- 
2.34.1