aboutsummaryrefslogtreecommitdiff
path: root/drivers/memstick
diff options
context:
space:
mode:
authorAlex Dubov <oakad@yahoo.com>2008-07-25 19:45:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 12:00:04 -0700
commit17017d8d2c005734d7088d8281ce2daab8fcb097 (patch)
treedf689658df7d342143ad399bddf0df7257e8ec20 /drivers/memstick
parentb77899985bdfd85a8e5a6e485033a9b4713d2471 (diff)
downloadvexpress-lsk-17017d8d2c005734d7088d8281ce2daab8fcb097.tar.gz
memstick: add "start" and "stop" methods to memstick device
In some cases it may be desirable to ensure that associated driver is not going to access the media in some period of time. "start" and "stop" methods are provided therefore to allow it. Signed-off-by: Alex Dubov <oakad@yahoo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/memstick')
-rw-r--r--drivers/memstick/core/memstick.c11
-rw-r--r--drivers/memstick/core/mspro_block.c33
2 files changed, 41 insertions, 3 deletions
diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
index 3c7d9a79c1e..7162f772bbf 100644
--- a/drivers/memstick/core/memstick.c
+++ b/drivers/memstick/core/memstick.c
@@ -433,8 +433,11 @@ static void memstick_check(struct work_struct *work)
dev_dbg(&host->dev, "memstick_check started\n");
mutex_lock(&host->lock);
- if (!host->card)
- memstick_power_on(host);
+ if (!host->card) {
+ if (memstick_power_on(host))
+ goto out_power_off;
+ } else
+ host->card->stop(host->card);
card = memstick_alloc_card(host);
@@ -452,7 +455,8 @@ static void memstick_check(struct work_struct *work)
|| !(host->card->check(host->card))) {
device_unregister(&host->card->dev);
host->card = NULL;
- }
+ } else
+ host->card->start(host->card);
}
if (!host->card) {
@@ -465,6 +469,7 @@ static void memstick_check(struct work_struct *work)
kfree(card);
}
+out_power_off:
if (!host->card)
host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 477d0fb6e58..004ac4d176d 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -752,6 +752,37 @@ static int mspro_block_has_request(struct mspro_block_data *msb)
return rc;
}
+static void mspro_block_stop(struct memstick_dev *card)
+{
+ struct mspro_block_data *msb = memstick_get_drvdata(card);
+ int rc = 0;
+ unsigned long flags;
+
+ while (1) {
+ spin_lock_irqsave(&msb->q_lock, flags);
+ if (!msb->has_request) {
+ blk_stop_queue(msb->queue);
+ rc = 1;
+ }
+ spin_unlock_irqrestore(&msb->q_lock, flags);
+
+ if (rc)
+ break;
+
+ wait_for_completion(&card->mrq_complete);
+ }
+}
+
+static void mspro_block_start(struct memstick_dev *card)
+{
+ struct mspro_block_data *msb = memstick_get_drvdata(card);
+ unsigned long flags;
+
+ spin_lock_irqsave(&msb->q_lock, flags);
+ blk_start_queue(msb->queue);
+ spin_unlock_irqrestore(&msb->q_lock, flags);
+}
+
static int mspro_block_queue_thread(void *data)
{
struct memstick_dev *card = data;
@@ -1272,6 +1303,8 @@ static int mspro_block_probe(struct memstick_dev *card)
rc = mspro_block_init_disk(card);
if (!rc) {
card->check = mspro_block_check_card;
+ card->stop = mspro_block_stop;
+ card->start = mspro_block_start;
return 0;
}