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-rw-r--r--arch/um/drivers/ubd_kern.c41
1 files changed, 26 insertions, 15 deletions
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 5ef47b73ce99..9200a457eb98 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -503,7 +503,7 @@ static LIST_HEAD(restart);
/* Called without dev->lock held, and only in interrupt context. */
static void ubd_handler(void)
{
- struct io_thread_req req;
+ struct io_thread_req *req;
struct request *rq;
struct ubd *ubd;
struct list_head *list, *next_ele;
@@ -511,7 +511,8 @@ static void ubd_handler(void)
int n;
while(1){
- n = os_read_file_k(thread_fd, &req, sizeof(req));
+ n = os_read_file_k(thread_fd, &req,
+ sizeof(struct io_thread_req *));
if(n != sizeof(req)){
if(n == -EAGAIN)
break;
@@ -520,10 +521,11 @@ static void ubd_handler(void)
return;
}
- rq = req.req;
- rq->nr_sectors -= req.length >> 9;
+ rq = req->req;
+ rq->nr_sectors -= req->length >> 9;
if(rq->nr_sectors == 0)
ubd_finish(rq, rq->hard_nr_sectors << 9);
+ kfree(req);
}
reactivate_fd(thread_fd, UBD_IRQ);
@@ -1078,7 +1080,7 @@ static void prepare_request(struct request *req, struct io_thread_req *io_req,
/* Called with dev->lock held */
static void do_ubd_request(request_queue_t *q)
{
- struct io_thread_req io_req;
+ struct io_thread_req *io_req;
struct request *req;
int n;
@@ -1099,13 +1101,20 @@ static void do_ubd_request(request_queue_t *q)
while(dev->start_sg < dev->end_sg){
struct scatterlist *sg = &dev->sg[dev->start_sg];
- prepare_request(req, &io_req,
+ io_req = kmalloc(sizeof(struct io_thread_req),
+ GFP_KERNEL | GFP_ATOMIC);
+ if(io_req == NULL){
+ if(list_empty(&dev->restart))
+ list_add(&dev->restart, &restart);
+ return;
+ }
+ prepare_request(req, io_req,
(unsigned long long) req->sector << 9,
sg->offset, sg->length, sg->page);
- n = os_write_file_k(thread_fd, (char *) &io_req,
- sizeof(io_req));
- if(n != sizeof(io_req)){
+ n = os_write_file_k(thread_fd, &io_req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *)){
if(n != -EAGAIN)
printk("write to io thread failed, "
"errno = %d\n", -n);
@@ -1437,13 +1446,14 @@ static int io_count = 0;
int io_thread(void *arg)
{
- struct io_thread_req req;
+ struct io_thread_req *req;
int n;
ignore_sigwinch_sig();
while(1){
- n = os_read_file_k(kernel_fd, &req, sizeof(req));
- if(n != sizeof(req)){
+ n = os_read_file_k(kernel_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *)){
if(n < 0)
printk("io_thread - read failed, fd = %d, "
"err = %d\n", kernel_fd, -n);
@@ -1454,9 +1464,10 @@ int io_thread(void *arg)
continue;
}
io_count++;
- do_io(&req);
- n = os_write_file_k(kernel_fd, &req, sizeof(req));
- if(n != sizeof(req))
+ do_io(req);
+ n = os_write_file_k(kernel_fd, &req,
+ sizeof(struct io_thread_req *));
+ if(n != sizeof(struct io_thread_req *))
printk("io_thread - write failed, fd = %d, err = %d\n",
kernel_fd, -n);
}