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Subject: [PATCH v2 2/2] elevator: acquire q->sysfs_lock in elevator_change()
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To: linux-kernel@vger.kernel.org
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From: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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Cc: axboe@kernel.dk, tj@kernel.org, seiji.aguchi@hds.com,
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9827a32 |
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9827a32 |
Add locking of q->sysfs_lock into elevator_change() (an exported function)
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to ensure it is held to protect q->elevator from elevator_init(), even if
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elevator_change() is called from non-sysfs paths.
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sysfs path (elv_iosched_store) uses __elevator_change(), non-locking
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version, as the lock is already taken by elv_iosched_store().
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Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
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---
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block/elevator.c | 16 ++++++++++++++--
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1 file changed, 14 insertions(+), 2 deletions(-)
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diff --git a/block/elevator.c b/block/elevator.c
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index 02d4390..6d765f7 100644
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--- a/block/elevator.c
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+++ b/block/elevator.c
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@@ -965,7 +965,7 @@ fail_init:
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/*
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* Switch this queue to the given IO scheduler.
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*/
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-int elevator_change(struct request_queue *q, const char *name)
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+static int __elevator_change(struct request_queue *q, const char *name)
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{
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char elevator_name[ELV_NAME_MAX];
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struct elevator_type *e;
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@@ -987,6 +987,18 @@ int elevator_change(struct request_queue *q, const char *name)
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return elevator_switch(q, e);
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}
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+
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+int elevator_change(struct request_queue *q, const char *name)
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+{
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+ int ret;
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+
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+ /* Protect q->elevator from elevator_init() */
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+ mutex_lock(&q->sysfs_lock);
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+ ret = __elevator_change(q, name);
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+ mutex_unlock(&q->sysfs_lock);
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+
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+ return ret;
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+}
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EXPORT_SYMBOL(elevator_change);
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ssize_t elv_iosched_store(struct request_queue *q, const char *name,
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@@ -997,7 +1009,7 @@ ssize_t elv_iosched_store(struct request_queue *q, const char *name,
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if (!q->elevator)
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return count;
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9827a32 |
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- ret = elevator_change(q, name);
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+ ret = __elevator_change(q, name);
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if (!ret)
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return count;
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9827a32 |
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9827a32 |
--
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9827a32 |
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