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Commit 33755305 authored by Venkata Rao Kakani's avatar Venkata Rao Kakani
Browse files

drivers: soc: rename block device nodes 



Rename block driver enables the renaming of block dev
nodes assigned by generic driver.

Change-Id: If4acbfdc13bd6c87e761af8ff8eeab9c0c6770d6
Signed-off-by: default avatarVenkata Rao Kakani <vkakani@codeaurora.org>
parent 9499b3ff

drivers/soc/qcom/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -1061,4 +1061,10 @@ config QCOM_HYP_CORE_CTL 
	  An offline CPU is considered as a reserved CPU since this OS can't use

	  it.



config RENAME_BLOCK_DEVICE

	bool "Rename block device node in /dev"

	help

	  This driver is used to rename the block device node assigned by generic driver

	  to a name that is needed.



source "drivers/soc/qcom/wcnss/Kconfig"

drivers/soc/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -118,3 +118,4 @@ obj-$(CONFIG_QCOM_ADSP_MANUAL_VOTE) += adsp_vote_qmi.o adsp_lpm_voting_v01.o 
obj-$(CONFIG_CPU_V7) += idle-v7.o

obj-$(CONFIG_MSM_BAM_DMUX) += bam_dmux.o

obj-$(CONFIG_WCNSS_CORE) += wcnss/

obj-$(CONFIG_RENAME_BLOCK_DEVICE) += rename_block_device.o

drivers/soc/qcom/rename_block_device.c

0 → 100644
+65 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2020 The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#include <linux/init.h>

#include <linux/module.h>

#include <linux/mount.h>

#include <linux/genhd.h>

#include <linux/device.h>

#include <linux/of.h>

#define PATH_SIZE	32



static int rename_blk_dev_init(void)

{

	dev_t dev;

	int index = 0, partno;

	struct gendisk *disk;

	struct device_node *node;

	char dev_path[PATH_SIZE];

	const char *actual_name, *modified_name;



	node = of_find_compatible_node(NULL, NULL, "qcom,blkdev-rename");

	if (!node) {

		pr_err("qcom,blkdev-rename is missing\n");

		goto out;

	}

	while (!of_property_read_string_index(node, "actual-dev", index,

						&actual_name)) {

		memset(dev_path, '\0', PATH_SIZE);

		snprintf(dev_path, PATH_SIZE, "/dev/%s", actual_name);

		dev = name_to_dev_t(dev_path);

		if (!dev) {

			pr_err("No device path : %s\n", dev_path);

			return -EINVAL;

		}

		disk = get_gendisk(dev, &partno);

		if (!disk) {

			pr_err("No device with dev path : %s\n", dev_path);

			return -ENXIO;

		}

		if (!of_property_read_string_index(node, "rename-dev", index,

							&modified_name)) {

			device_rename(disk_to_dev(disk), modified_name);

		} else {

			pr_err("rename-dev for actual-dev = %s is missing",

								 actual_name);

			return -ENXIO;

		}

		index++;

	}

out:

	return  0;

}



late_initcall(rename_blk_dev_init);

MODULE_DESCRIPTION("Rename block devices");

MODULE_LICENSE("GPL v2");