[PATCH 1/3] bsg: fix bsg_poll() to return POLLOUT properly

[PATCH 1/3] bsg: fix bsg_poll() to return POLLOUT properly

[Namhyung Kim]

POLLOUT should be returned only if bd->queued_cmds < bd->max_queue
so that bsg_alloc_command() can proceed.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
---
 block/bsg.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index 0c8b64a16484..c4f49e255751 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -878,7 +878,7 @@ static unsigned int bsg_poll(struct file *file, poll_table *wait)
 	spin_lock_irq(&bd->lock);
 	if (!list_empty(&bd->done_list))
 		mask |= POLLIN | POLLRDNORM;
-	if (bd->queued_cmds >= bd->max_queue)
+	if (bd->queued_cmds < bd->max_queue)
 		mask |= POLLOUT;
 	spin_unlock_irq(&bd->lock);
 
-- 
1.7.5

[PATCH 2/3] bsg: remove unnecessary conditional expressions

[Namhyung Kim]

Second condition in OR always implies first condition is false
thus bytes_read in the second is not needed. The same goes to
bytes_written.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
---
 block/bsg.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index c4f49e255751..b7e42ad55361 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -606,7 +606,7 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 	ret = __bsg_read(buf, count, bd, NULL, &bytes_read);
 	*ppos = bytes_read;
 
-	if (!bytes_read || (bytes_read && err_block_err(ret)))
+	if (!bytes_read || err_block_err(ret))
 		bytes_read = ret;
 
 	return bytes_read;
@@ -686,7 +686,7 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 	/*
 	 * return bytes written on non-fatal errors
 	 */
-	if (!bytes_written || (bytes_written && err_block_err(ret)))
+	if (!bytes_written || err_block_err(ret))
 		bytes_written = ret;
 
 	dprintk("%s: returning %Zd\n", bd->name, bytes_written);
-- 
1.7.5

[PATCH 3/3] bsg: fix address space warning from sparse

[Namhyung Kim]

copy_from/to_user() and blk_rq_map_user() want __user pointer.
This patch fixes following warnings from sparse:

   CHECK   block/bsg.c
 block/bsg.c:185:38: warning: incorrect type in argument 2 (different address spaces)
 block/bsg.c:185:38:    expected void const [noderef] <asn:1>*from
 block/bsg.c:185:38:    got void *<noident>
 block/bsg.c:295:58: warning: incorrect type in argument 4 (different address spaces)
 block/bsg.c:295:58:    expected void [noderef] <asn:1>*<noident>
 block/bsg.c:295:58:    got void *[assigned] dxferp
 block/bsg.c:311:52: warning: incorrect type in argument 4 (different address spaces)
 block/bsg.c:311:52:    expected void [noderef] <asn:1>*<noident>
 block/bsg.c:311:52:    got void *[assigned] dxferp
 block/bsg.c:448:37: warning: incorrect type in argument 1 (different address spaces)
 block/bsg.c:448:37:    expected void [noderef] <asn:1>*dst
 block/bsg.c:448:37:    got void *<noident>

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
---
 block/bsg.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index b7e42ad55361..702f1316bb8f 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -182,7 +182,7 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
 			return -ENOMEM;
 	}
 
-	if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
+	if (copy_from_user(rq->cmd, (void __user *)(unsigned long)hdr->request,
 			   hdr->request_len))
 		return -EFAULT;
 
@@ -249,7 +249,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
 	struct request *rq, *next_rq = NULL;
 	int ret, rw;
 	unsigned int dxfer_len;
-	void *dxferp = NULL;
+	void __user *dxferp = NULL;
 	struct bsg_class_device *bcd = &q->bsg_dev;
 
 	/* if the LLD has been removed then the bsg_unregister_queue will
@@ -291,7 +291,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
 		rq->next_rq = next_rq;
 		next_rq->cmd_type = rq->cmd_type;
 
-		dxferp = (void*)(unsigned long)hdr->din_xferp;
+		dxferp = (void __user *)(unsigned long)hdr->din_xferp;
 		ret =  blk_rq_map_user(q, next_rq, NULL, dxferp,
 				       hdr->din_xfer_len, GFP_KERNEL);
 		if (ret)
@@ -300,10 +300,10 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
 
 	if (hdr->dout_xfer_len) {
 		dxfer_len = hdr->dout_xfer_len;
-		dxferp = (void*)(unsigned long)hdr->dout_xferp;
+		dxferp = (void __user *)(unsigned long)hdr->dout_xferp;
 	} else if (hdr->din_xfer_len) {
 		dxfer_len = hdr->din_xfer_len;
-		dxferp = (void*)(unsigned long)hdr->din_xferp;
+		dxferp = (void __user *)(unsigned long)hdr->din_xferp;
 	} else
 		dxfer_len = 0;
 
@@ -445,7 +445,7 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
 		int len = min_t(unsigned int, hdr->max_response_len,
 					rq->sense_len);
 
-		ret = copy_to_user((void*)(unsigned long)hdr->response,
+		ret = copy_to_user((void __user *)(unsigned long)hdr->response,
 				   rq->sense, len);
 		if (!ret)
 			hdr->response_len = len;
-- 
1.7.5

Re: [PATCH 1/3] bsg: fix bsg_poll() to return POLLOUT properly

[Jens Axboe]

On 2011-05-18 20:09, FUJITA Tomonori wrote:
> On Sun, 15 May 2011 14:31:51 +0900
> Namhyung Kim <namhyung@gmail.com> wrote:
> 
>> POLLOUT should be returned only if bd->queued_cmds < bd->max_queue
>> so that bsg_alloc_command() can proceed.
>>
>> Signed-off-by: Namhyung Kim <namhyung@gmail.com>
>> ---
>>  block/bsg.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> All the three patches look good.
> 
> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

You can add mine, too.

Acked-by: Jens Axboe <jaxboe@fusionio.com>

-- 
Jens Axboe