On 31/05/2024 08:47, Christoph Hellwig wrote:
Instead of a separate handler function that leaves no work in the
interrupt hanler itself, split out a per-request end I/O helper and
clean up the coding style and variable naming while we're at it.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
arch/um/drivers/ubd_kern.c | 49 ++++++++++++++------------------------
1 file changed, 18 insertions(+), 31 deletions(-)
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index ef805eaa9e013d..0c9542d58c01b7 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -447,43 +447,30 @@ static int bulk_req_safe_read(
return n;
}
-/* Called without dev->lock held, and only in interrupt context. */
-static void ubd_handler(void)
+static void ubd_end_request(struct io_thread_req *io_req)
{
- int n;
- int count;
-
- while(1){
- n = bulk_req_safe_read(
- thread_fd,
- irq_req_buffer,
- &irq_remainder,
- &irq_remainder_size,
- UBD_REQ_BUFFER_SIZE
- );
- if (n < 0) {
- if(n == -EAGAIN)
- break;
- printk(KERN_ERR "spurious interrupt in ubd_handler, "
- "err = %d\n", -n);
- return;
- }
- for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
- struct io_thread_req *io_req = (*irq_req_buffer)[count];
-
- if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
- blk_queue_max_discard_sectors(io_req->req->q, 0);
- blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
- }
- blk_mq_end_request(io_req->req, io_req->error);
- kfree(io_req);
- }
+ if (io_req->error == BLK_STS_NOTSUPP &&
+ req_op(io_req->req) == REQ_OP_DISCARD) {
+ blk_queue_max_discard_sectors(io_req->req->q, 0);
+ blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
}
+ blk_mq_end_request(io_req->req, io_req->error);
+ kfree(io_req);
}
static irqreturn_t ubd_intr(int irq, void *dev)
{
- ubd_handler();
+ int len, i;
+
+ while ((len = bulk_req_safe_read(thread_fd, irq_req_buffer,
+ &irq_remainder, &irq_remainder_size,
+ UBD_REQ_BUFFER_SIZE)) >= 0) {
+ for (i = 0; i < len / sizeof(struct io_thread_req *); i++)
+ ubd_end_request((*irq_req_buffer)[i]);
+ }
+
+ if (len < 0 && len != -EAGAIN)
+ pr_err("spurious interrupt in %s, err = %d\n", __func__, len);
return IRQ_HANDLED;
}
Acked-By: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
--
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/
