diff options
| author | Tejun Heo <tj@kernel.org> | 2009-04-28 12:38:32 +0900 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-04-28 20:24:19 +0200 |
| commit | 39f36b47caae1443eb37c34c6def108bb79f8d25 (patch) | |
| tree | ffa4b5b23d0a3ebd963ba2fdecd594745075f680 | |
| parent | 27b1833279995e7c290a40cac4ef36ccea7e9283 (diff) | |
mg_disk: fix locking
IRQ and timeout handlers call functions which expect locked queue lock
without locking it. Fix it.
While at it, convert 0s used as null pointer constant to NULLs.
[ Impact: fix locking, cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: unsik Kim <donari75@gmail.com>
| -rw-r--r-- | drivers/block/mg_disk.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c index fb39d9aa3cd..d3e72ad08db 100644 --- a/drivers/block/mg_disk.c +++ b/drivers/block/mg_disk.c @@ -160,11 +160,16 @@ static irqreturn_t mg_irq(int irq, void *dev_id) struct mg_host *host = dev_id; void (*handler)(struct mg_host *) = host->mg_do_intr; - host->mg_do_intr = 0; + spin_lock(&host->lock); + + host->mg_do_intr = NULL; del_timer(&host->timer); if (!handler) handler = mg_unexpected_intr; handler(host); + + spin_unlock(&host->lock); + return IRQ_HANDLED; } @@ -319,7 +324,7 @@ static void mg_read(struct request *req) remains = req->nr_sectors; - if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, 0) != + if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, NULL) != MG_ERR_NONE) mg_bad_rw_intr(host); @@ -363,7 +368,7 @@ static void mg_write(struct request *req) remains = req->nr_sectors; - if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, 0) != + if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, NULL) != MG_ERR_NONE) { mg_bad_rw_intr(host); return; @@ -521,9 +526,11 @@ void mg_times_out(unsigned long data) char *name; struct request *req; + spin_lock_irq(&host->lock); + req = elv_next_request(host->breq); if (!req) - return; + goto out_unlock; host->mg_do_intr = NULL; @@ -534,6 +541,8 @@ void mg_times_out(unsigned long data) mg_bad_rw_intr(host); mg_request(host->breq); +out_unlock: + spin_unlock_irq(&host->lock); } static void mg_request_poll(struct request_queue *q) |