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| author |   Tejun Heo <tj@kernel.org> | 2009-04-28 12:38:32 +0900 |
|---|---|---|
| committer |   Jens Axboe <jens.axboe@oracle.com> | 2009-04-28 07:36:56 +0200 |
| commit | ac2ff946a53e7bd0ae98f4e5d1d6c1b1dced82e5 (patch) | |
| tree | ab50d2e1bcf5c76bb9e018839d77ff531e7e4c83 /drivers/block/mg_disk.c | |
| parent | sparc: convert to use __HEAD and HEAD_TEXT macros. (diff) | |
| download | linux-dev-ac2ff946a53e7bd0ae98f4e5d1d6c1b1dced82e5.tar.xz linux-dev-ac2ff946a53e7bd0ae98f4e5d1d6c1b1dced82e5.zip | |
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>
Diffstat (limited to 'drivers/block/mg_disk.c')
| -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 fb39d9aa3cdc..d3e72ad08dbe 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) |