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| author | Adrian Hunter <adrian.hunter@intel.com> | 2016-11-29 12:09:10 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-12-05 10:31:03 +0100 |
| commit | e0097cf5f2f1b7b8a594beaa32a604776d3ca6ce (patch) | |
| tree | c8bf2968781103c73931e6d3ad2791e529a948d1 /drivers/mmc/card/queue.h | |
| parent | 5be80375f5a030e5f5beba76620380da5ea6cefa (diff) | |
| download | linux-stable-e0097cf5f2f1b7b8a594beaa32a604776d3ca6ce.tar.gz linux-stable-e0097cf5f2f1b7b8a594beaa32a604776d3ca6ce.tar.bz2 linux-stable-e0097cf5f2f1b7b8a594beaa32a604776d3ca6ce.zip | |
mmc: queue: Fix queue thread wake-up
The only time the driver sleeps expecting to be woken upon the arrival of
a new request, is when the dispatch queue is empty. The only time that it
is known whether the dispatch queue is empty is after NULL is returned
from blk_fetch_request() while under the queue lock.
Recognizing those facts, simplify the synchronization between the queue
thread and the request function. A couple of flags tell the request
function what to do, and the queue lock and barriers associated with
wake-ups ensure synchronization.
The result is simpler and allows the removal of the context_info lock.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Harjani Ritesh <riteshh@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/card/queue.h')
| -rw-r--r-- | drivers/mmc/card/queue.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h index 47f5532b5776..d09fce655800 100644 --- a/drivers/mmc/card/queue.h +++ b/drivers/mmc/card/queue.h @@ -39,6 +39,7 @@ struct mmc_queue { unsigned int flags; #define MMC_QUEUE_SUSPENDED (1 << 0) #define MMC_QUEUE_NEW_REQUEST (1 << 1) + bool asleep; struct mmc_blk_data *blkdata; struct request_queue *queue; struct mmc_queue_req mqrq[2]; |