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mei: keep the device awake during reads in chunks 

Long messages are read in chunks, to prevent trashing runtime pm between
the reading of the chunks we call pm_runtime_mark_last_busy() on
non-final chunk message as the next chunk of the same message will be
received immediately in the next interrupt with high probablity.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2015-10-13 15:02:38 +03:00 committed by Greg Kroah-Hartman
parent 97ccf63f42
commit 34af19132e
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/mei/interrupt.c
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@ -21,6 +21,7 @@
#include <linux/fs.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/mei.h>
@ -147,6 +148,9 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
cb->read_time = jiffies;
cl_dbg(dev, cl, "completed read length = %lu\n", cb->buf_idx);
list_move_tail(&cb->list, &complete_list->list);
} else {
pm_runtime_mark_last_busy(dev->dev);
pm_request_autosuspend(dev->dev);
}
out: