linux-kernel - [PATCH v6 1/6] devres: provide devm_krealloc

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Message-ID: <20221117160447.294491-2-jjhiblot@traphandler.com>
Date:   Thu, 17 Nov 2022 17:04:42 +0100
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     <lee.jones@...aro.org>, <pavel@....cz>, <robh+dt@...nel.org>,
        <sven.schwermer@...ruptive-technologies.com>,
        <krzysztof.kozlowski+dt@...aro.org>
CC:     <johan+linaro@...nel.org>, <marijn.suijten@...ainline.org>,
        <bjorn.andersson@...aro.org>, <andy.shevchenko@...il.com>,
        <jacek.anaszewski@...il.com>, <linux-leds@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH v6 1/6] devres: provide devm_krealloc_array()

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@...phandler.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 include/linux/device.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 424b55df0272..3b472df6c6cd 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);
-- 
2.25.1