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| author | Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> | 2007-11-22 21:26:01 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-11-26 19:39:01 -0800 |
| commit | cdb32706f6948238ed6d1d85473c64c27366e9e9 (patch) | |
| tree | bc8b267a0b861bbafae9c384cf80a03e14db8bbd /Documentation/parport-lowlevel.txt | |
| parent | f6ce5cca74b8681fdf1d7307edc66a7213b43f6f (diff) | |
| download | lwn-cdb32706f6948238ed6d1d85473c64c27366e9e9.tar.gz lwn-cdb32706f6948238ed6d1d85473c64c27366e9e9.zip | |
plip: fix parport_register_device name parameter
Plip passes a string "name" that is allocated on stack to
parport_register_device. parport_register_device holds the pointer to
"name" and when the registering function exits, it points nowhere.
On some machine, this bug causes bad names to appear in /proc, such as
/proc/sys/dev/parport/parport0/devices/T^/�X^/�, on others, the plip
proc node is completely missing.
The patch also fixes documentation to note this requirement.
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/parport-lowlevel.txt')
| -rw-r--r-- | Documentation/parport-lowlevel.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/parport-lowlevel.txt b/Documentation/parport-lowlevel.txt index 265fcdcb8e5f..120eb20dbb09 100644 --- a/Documentation/parport-lowlevel.txt +++ b/Documentation/parport-lowlevel.txt @@ -339,6 +339,10 @@ Use this function to register your device driver on a parallel port ('port'). Once you have done that, you will be able to use parport_claim and parport_release in order to use the port. +The ('name') argument is the name of the device that appears in /proc +filesystem. The string must be valid for the whole lifetime of the +device (until parport_unregister_device is called). + This function will register three callbacks into your driver: 'preempt', 'wakeup' and 'irq'. Each of these may be NULL in order to indicate that you do not want a callback. |