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ide: use per-device request queue locks (v2)

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* Move hack for flush requests from choose_drive() to do_ide_request().

* Add ide_plug_device() helper and convert core IDE code from using
  per-hwgroup lock as a request lock to use the ->queue_lock instead.

* Remove no longer needed:
  - choose_drive() function
  - WAKEUP() macro
  - 'sleeping' flag from ide_hwif_t
  - 'service_{start,time}' fields from ide_drive_t

This patch results in much simpler and more maintainable code
(besides being a scalability improvement).

v2:
* Fixes/improvements based on review from Elias:
  - take as many requests off the queue as possible
  - remove now redundant BUG_ON()

Cc: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-01-02 16:12:50 +01:00
parent 631de3708d
commit 201bffa464
4 changed files with 79 additions and 159 deletions
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4
include/linux/ide.h
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@ -603,8 +603,6 @@ struct ide_drive_s {
unsigned long dev_flags;
unsigned long sleep; /* sleep until this time */
unsigned long service_start; /* time we started last request */
unsigned long service_time; /* service time of last request */
unsigned long timeout; /* max time to wait for irq */
special_t special; /* special action flags */
@ -872,8 +870,6 @@ typedef struct hwgroup_s {
/* BOOL: protects all fields below */
volatile int busy;
/* BOOL: wake us up on timer expiry */
unsigned int sleeping : 1;
/* BOOL: polling active & poll_timeout field valid */
unsigned int polling : 1;