[PATCH] driver core: Convert '/' to '!' in dev_set_name()

[Roland Dreier <rdreier@cisco.com>]

Commit 3ada8b7e ("block: struct device - replace bus_id with dev_name(),
dev_set_name()") deleted the code in register_disk() that changed a '/'
to a '!' in the device name when registering a disk, but dev_set_name()
does not perform this conversion.

This leads to amusing problems with disks that have '/' in their names:
for example a failure to boot with the root partition on a cciss device,
even though the kernel says it knows about the root device:

    VFS: Cannot open root device "cciss/c0d0p6" or unknown-block(0,0)
    Please append a correct "root=" boot option; here are the available partitions:
    6800        71652960 cciss/c0d0 driver: cciss
      6802               1 cciss/c0d0p2
      6805         2931831 cciss/c0d0p5
      6806        34354908 cciss/c0d0p6
    6810        71652960 cciss/c0d1 driver: cciss

Fix this by adding code to change '/' to '!' in dev_set_name() to handle
this until dev_set_name() is converted to use kobject_set_name().

Signed-off-by: Roland Dreier <rolandd@cisco.com>
---
OK, this is tested to work on my system as well.

 drivers/base/core.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8079afc..55e5309 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -777,10 +777,16 @@ static void device_remove_class_symlinks(struct device *dev)
 int dev_set_name(struct device *dev, const char *fmt, ...)
 {
 	va_list vargs;
+	char *s;
 
 	va_start(vargs, fmt);
 	vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs);
 	va_end(vargs);
+
+	/* ewww... some of these buggers have / in the name... */
+	while ((s = strchr(dev->bus_id, '/')))
+		*s = '!';
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(dev_set_name);