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V4L/DVB: drivers/media/IR - improve keytable code

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The attached patch rewrites much of the keytable code in
drivers/media/IR/ir-keytable.c.

The scancodes are now inserted into the array in sorted
order which allows for a binary search on lookup.

The code has also been shrunk by about 150 lines.

In addition it fixes the following bugs:

Any use of ir_seek_table() was racy.

ir_dev->driver_name is leaked between ir_input_register() and
ir_input_unregister().

ir_setkeycode() unconditionally does clear_bit() on dev->keybit
when removing a mapping, but there might be another mapping with
a different scancode and the same keycode.

This version has been updated to incorporate patch feedback from
Mauro Carvalho Chehab.

[[email protected]: Fix a conflict with RC keytable breakup patches and input changes]

Signed-off-by: David Härdeman <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
David Härdeman 2010-04-02 15:58:28 -03:00 • committed by Mauro Carvalho Chehab
commit b3074c0a3f
2 changed files with 191 additions and 331 deletions
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4
include/media/ir-core.h
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@ -47,7 +47,9 @@ struct ir_scancode {
struct ir_scancode_table {
struct ir_scancode *scan;
int size;
unsigned int size; /* Max number of entries */
unsigned int len; /* Used number of entries */
unsigned int alloc; /* Size of *scan in bytes */
u64 ir_type;
char *name;
spinlock_t lock;