Commit 39f36b47 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe

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: default avatarTejun Heo <tj@kernel.org>
Cc: unsik Kim <donari75@gmail.com>
parent 27b18332
......@@ -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)
......
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