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Commit 9330da93 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: I40f966717683efb9800dcb34ed851f95cb22e3c8
Signed-off-by: default avatarVenkata Rao Kakani <vkakani@codeaurora.org>
parent 82ee11b4

drivers/soc/qcom/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -1156,5 +1156,14 @@ config QCOM_RTIC 
	  will trigger RTIC kernel MP.s (measurement parameters) generation

	  during the kernel build.



config RENAME_BLOCK_DEVICE

	tristate "Rename block device node in /dev"

	default n

	help

	  Say 'Y' to to rename the block device node assigned by generic

	  driver to a name that is needed. This is used for rename block

	  device names created by default as sda1, sda2 etc. to the

	  names system is needed.this is applicable for block devices only.



source "drivers/soc/qcom/icnss2/Kconfig"

endmenu

drivers/soc/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -104,3 +104,4 @@ obj-$(CONFIG_QTI_HW_MEMLAT_SCMI_CLIENT) += memlat_scmi.o 
obj-$(CONFIG_QTI_HW_MEMLAT) += rimps_memlat.o

obj-$(CONFIG_QTI_HW_MEMLAT_LOG)	+= rimps_log.o

obj-$(CONFIG_QCOM_QFPROM_SYS) += qfprom-sys.o

obj-$(CONFIG_RENAME_BLOCK_DEVICE) += rename_block_device.o

drivers/soc/qcom/rename_block_device.c

0 → 100644
+58 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2021, The Linux Foundation. All rights reserved.

 */



#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\n",

								 actual_name);

			return -ENXIO;

		}

		index++;

	}

out:

	return  0;

}



late_initcall(rename_blk_dev_init);

MODULE_DESCRIPTION("Rename block devices");

MODULE_LICENSE("GPL v2");