| Message ID | 20240531074837.1648501-2-hch@lst.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [01/14] ubd: refactor the interrupt handler | expand |
Christoph, > 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 ^^^^^^ handler > clean up the coding style and variable naming while we're at it. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
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@lst.de> > Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> > --- > 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@cambridgegreys.com>
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; }
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@lst.de> --- arch/um/drivers/ubd_kern.c | 49 ++++++++++++++------------------------ 1 file changed, 18 insertions(+), 31 deletions(-)