linux-kernel - [PATCH 07/11] persistent_ram: Introduce persistent_ram

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Date:	Fri, 11 May 2012 17:18:05 -0700
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Colin Cross <ccross@...roid.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>, arve@...roid.com,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Jesper Juhl <jj@...osbits.net>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	kernel-team@...roid.com
Subject: [PATCH 07/11] persistent_ram: Introduce persistent_ram_free()

A corresponding function to persistent_ram_new().

Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
---
 drivers/staging/android/persistent_ram.c |   15 +++++++++++++++
 drivers/staging/android/persistent_ram.h |    3 +++
 2 files changed, 18 insertions(+)

diff --git a/drivers/staging/android/persistent_ram.c b/drivers/staging/android/persistent_ram.c
index c16d7c2..63481da 100644
--- a/drivers/staging/android/persistent_ram.c
+++ b/drivers/staging/android/persistent_ram.c
@@ -364,6 +364,9 @@ static void *persistent_ram_iomap(phys_addr_t start, size_t size)
 static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
 		struct persistent_ram_zone *prz)
 {
+	prz->paddr = start;
+	prz->size = size;
+
 	if (pfn_valid(start >> PAGE_SHIFT))
 		prz->vaddr = persistent_ram_vmap(start, size);
 	else
@@ -437,6 +440,18 @@ static int __init persistent_ram_post_init(struct persistent_ram_zone *prz, bool
 	return 0;
 }
 
+void persistent_ram_free(struct persistent_ram_zone *prz)
+{
+	if (pfn_valid(prz->paddr >> PAGE_SHIFT)) {
+		vunmap(prz->vaddr);
+	} else {
+		iounmap(prz->vaddr);
+		release_mem_region(prz->paddr, prz->size);
+	}
+	persistent_ram_free_old(prz);
+	kfree(prz);
+}
+
 struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
 						       size_t size,
 						       bool ecc)
diff --git a/drivers/staging/android/persistent_ram.h b/drivers/staging/android/persistent_ram.h
index 8154d15..d3b2b45 100644
--- a/drivers/staging/android/persistent_ram.h
+++ b/drivers/staging/android/persistent_ram.h
@@ -39,6 +39,8 @@ struct persistent_ram {
 };
 
 struct persistent_ram_zone {
+	phys_addr_t paddr;
+	size_t size;
 	void *vaddr;
 	struct persistent_ram_buffer *buffer;
 	size_t buffer_size;
@@ -66,6 +68,7 @@ int persistent_ram_early_init(struct persistent_ram *ram);
 struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
 						       size_t size,
 						       bool ecc);
+void persistent_ram_free(struct persistent_ram_zone *prz);
 struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
 		bool ecc);
 
-- 
1.7.9.2

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