From 16dc42e018c2868211b4928f20a957c0c216126c Mon Sep 17 00:00:00 2001 From: Stas Sergeev Date: Sat, 26 Apr 2008 19:52:35 +0400 Subject: [PATCH] driver core: warn about duplicate driver names on the same bus Currently an attempt to register multiple drivers with the same name causes the stack trace with some cryptic error message. The attached patch adds the necessary check and the clear error message. Signed-off-by: Stas Sergeev Signed-off-by: Greg Kroah-Hartman --- drivers/base/driver.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 9a6537f14401..2ef5acf4368b 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -217,12 +217,22 @@ static void driver_remove_groups(struct device_driver *drv, int driver_register(struct device_driver *drv) { int ret; + struct device_driver *other; if ((drv->bus->probe && drv->probe) || (drv->bus->remove && drv->remove) || (drv->bus->shutdown && drv->shutdown)) printk(KERN_WARNING "Driver '%s' needs updating - please use " "bus_type methods\n", drv->name); + + other = driver_find(drv->name, drv->bus); + if (other) { + put_driver(other); + printk(KERN_ERR "Error: Driver '%s' is already registered, " + "aborting...\n", drv->name); + return -EEXIST; + } + ret = bus_add_driver(drv); if (ret) return ret; -- 2.20.1