Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  bio: fix memcpy corruption in bio_copy_user_iov()
  hd: fix locking
  mg_disk: fix CONFIG_LBD=y warning
  mg_disk: fix locking

3 files changed, 24 insertions, 15 deletions

diff --git a/drivers/block/hd.c b/drivers/block/hd.c
index 3c11f06..baaa9e4 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -509,7 +509,6 @@ ok_to_write:
 	if (i > 0) {
 		SET_HANDLER(&write_intr);
 		outsw(HD_DATA, req->buffer, 256);
-		local_irq_enable();
 	} else {
 #if (HD_DELAY > 0)
 		last_req = read_timer();
@@ -541,8 +540,7 @@ static void hd_times_out(unsigned long dummy)
 	if (!CURRENT)
 		return;
 
-	disable_irq(HD_IRQ);
-	local_irq_enable();
+	spin_lock_irq(hd_queue->queue_lock);
 	reset = 1;
 	name = CURRENT->rq_disk->disk_name;
 	printk("%s: timeout\n", name);
@@ -552,9 +550,8 @@ static void hd_times_out(unsigned long dummy)
 #endif
 		end_request(CURRENT, 0);
 	}
-	local_irq_disable();
 	hd_request();
-	enable_irq(HD_IRQ);
+	spin_unlock_irq(hd_queue->queue_lock);
 }
 
 static int do_special_op(struct hd_i_struct *disk, struct request *req)
@@ -592,7 +589,6 @@ static void hd_request(void)
 		return;
 repeat:
 	del_timer(&device_timer);
-	local_irq_enable();
 
 	req = CURRENT;
 	if (!req) {
@@ -601,7 +597,6 @@ repeat:
 	}
 
 	if (reset) {
-		local_irq_disable();
 		reset_hd();
 		return;
 	}
@@ -660,9 +655,7 @@ repeat:
 
 static void do_hd_request(struct request_queue *q)
 {
-	disable_irq(HD_IRQ);
 	hd_request();
-	enable_irq(HD_IRQ);
 }
 
 static int hd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
@@ -684,12 +677,16 @@ static irqreturn_t hd_interrupt(int irq, void *dev_id)
 {
 	void (*handler)(void) = do_hd;
 
+	spin_lock(hd_queue->queue_lock);
+
 	do_hd = NULL;
 	del_timer(&device_timer);
 	if (!handler)
 		handler = unexpected_hd_interrupt;
 	handler();
-	local_irq_enable();
+
+	spin_unlock(hd_queue->queue_lock);
+
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index fb39d9a..f389835 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -79,7 +79,7 @@ static void mg_dump_status(const char *msg, unsigned int stat,
 			if (host->breq) {
 				req = elv_next_request(host->breq);
 				if (req)
-					printk(", sector=%ld", req->sector);
+					printk(", sector=%u", (u32)req->sector);
 			}
 
 		}
@@ -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)
diff --git a/fs/bio.c b/fs/bio.c
index 7bbc98f..9871164 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -817,6 +817,9 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 		len += iov[i].iov_len;
 	}
 
+	if (offset)
+		nr_pages++;
+
 	bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask);
 	if (!bmd)
 		return ERR_PTR(-ENOMEM);