[PATCH] nvmem: Fix read/write access to partition devices

[Stefan Riedmueller <s.riedmueller@xxxxxxxxx>]

Partition devices are not directly associated with the nvmem instance but via
their master cdev. Thus reading and writing needs to be handled via the
master.

Signed-off-by: Stefan Riedmueller <s.riedmueller@xxxxxxxxx>
---
 drivers/nvmem/core.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 25924872efa2..82e9d1996428 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -57,9 +57,14 @@ int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset,
 static ssize_t nvmem_cdev_read(struct cdev *cdev, void *buf, size_t count,
 			       loff_t offset, unsigned long flags)
 {
-	struct nvmem_device *nvmem = container_of(cdev, struct nvmem_device, cdev);
+	struct nvmem_device *nvmem;
 	ssize_t retlen;
 
+	if (!cdev->master)
+		nvmem = container_of(cdev, struct nvmem_device, cdev);
+	else
+		nvmem = container_of(cdev->master, struct nvmem_device, cdev);
+
 	dev_dbg(cdev->dev, "read ofs: 0x%08llx count: 0x%08zx\n",
 		offset, count);
 
@@ -71,9 +76,14 @@ static ssize_t nvmem_cdev_read(struct cdev *cdev, void *buf, size_t count,
 static ssize_t nvmem_cdev_write(struct cdev *cdev, const void *buf, size_t count,
 				loff_t offset, unsigned long flags)
 {
-	struct nvmem_device *nvmem = container_of(cdev, struct nvmem_device, cdev);
+	struct nvmem_device *nvmem;
 	ssize_t retlen;
 
+	if (!cdev->master)
+		nvmem = container_of(cdev, struct nvmem_device, cdev);
+	else
+		nvmem = container_of(cdev->master, struct nvmem_device, cdev);
+
 	dev_dbg(cdev->dev, "write ofs: 0x%08llx count: 0x%08zx\n",
 		offset, count);
 
-- 
2.7.4


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