The patch titled
SPI: alternative fix for spi_busnum_to_master
has been removed from the -mm tree. Its filename was
spi-alternative-fix-for-spi_busnum_to_master.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: SPI: alternative fix for spi_busnum_to_master
From: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
If a SPI master device exists, udev (udevtrigger) causes kernel crash, due
to wrong kobj pointer in kobject_uevent_env(). This problem was not in
2.6.19.
The backtrace (on MIPS) was:
[<8024db6c>] kobject_uevent_env+0x54c/0x5e8
[<802a8264>] store_uevent+0x1c/0x3c (in drivers/class.c)
[<801cb14c>] subsys_attr_store+0x2c/0x50
[<801cb80c>] flush_write_buffer+0x38/0x5c
[<801cb900>] sysfs_write_file+0xd0/0x190
[<80181444>] vfs_write+0xc4/0x1a0
[<80181cdc>] sys_write+0x54/0xa0
[<8010dae4>] stack_done+0x20/0x3c
flush_write_buffer() passes kobject of spi_master_class.subsys to
subsys_addr_store(), then subsys_addr_store() passes a pointer to a struct
subsystem to store_uevent() which expects a pointer to a struct
class_device. The problem seems subsys_attr_store() called instead of
class_device_attr_store().
This mismatch was caused by commit
3bd0f6943520e459659d10f3282285e43d3990f1, which overrides kset of master
class. This made spi_master_class.subsys.kset.ktype NULL so
subsys_sysfs_ops is used instead of class_dev_sysfs_ops.
The commit was to fix spi_busnum_to_master(). Here is a patch fixes
this function in other way, just searching children list of
class_device.
Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/spi/spi.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff -puN drivers/spi/spi.c~spi-alternative-fix-for-spi_busnum_to_master drivers/spi/spi.c
--- a/drivers/spi/spi.c~spi-alternative-fix-for-spi_busnum_to_master
+++ a/drivers/spi/spi.c
@@ -366,7 +366,6 @@ spi_alloc_master(struct device *dev, uns
class_device_initialize(&master->cdev);
master->cdev.class = &spi_master_class;
- kobj_set_kset_s(&master->cdev, spi_master_class.subsys);
master->cdev.dev = get_device(dev);
spi_master_set_devdata(master, &master[1]);
@@ -466,14 +465,20 @@ EXPORT_SYMBOL_GPL(spi_unregister_master)
*/
struct spi_master *spi_busnum_to_master(u16 bus_num)
{
- char name[9];
- struct kobject *bus;
-
- snprintf(name, sizeof name, "spi%u", bus_num);
- bus = kset_find_obj(&spi_master_class.subsys.kset, name);
- if (bus)
- return container_of(bus, struct spi_master, cdev.kobj);
- return NULL;
+ struct class_device *cdev;
+ struct spi_master *master = NULL;
+ struct spi_master *m;
+
+ down(&spi_master_class.sem);
+ list_for_each_entry(cdev, &spi_master_class.children, node) {
+ m = container_of(cdev, struct spi_master, cdev);
+ if (m->bus_num == bus_num) {
+ master = spi_master_get(m);
+ break;
+ }
+ }
+ up(&spi_master_class.sem);
+ return master;
}
EXPORT_SYMBOL_GPL(spi_busnum_to_master);
_
Patches currently in -mm which might be from anemo@xxxxxxxxxxxxx are
origin.patch
git-mips.patch
make-cardbus_mem_size-and-cardbus_io_size-boot-options.patch
make-cardbus_mem_size-and-cardbus_io_size-boot-options-fix.patch
serial-serial_txx9-driver-update.patch
-
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