From fcb136e1ac5774909e0d85189f721b8dfa800e0f Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Fri, 19 Apr 2013 22:01:35 +0300 Subject: mei: fix reading large reposnes While writting to device is limitted to max_msg_length advertized in client properites the read can be much longer delivered consequiting chunks. We use krealloc to enlarge the buffer when needed. Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/bus.c | 8 ++++---- drivers/misc/mei/client.c | 7 ++++--- drivers/misc/mei/client.h | 2 +- drivers/misc/mei/interrupt.c | 18 +++++++++++++++--- drivers/misc/mei/main.c | 7 +++---- 5 files changed, 27 insertions(+), 15 deletions(-) (limited to 'drivers/misc') diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 834ceeb69cbf..1e935eacaa7f 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -286,7 +286,7 @@ int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) mutex_lock(&dev->device_lock); if (!cl->read_cb) { - err = mei_cl_read_start(cl); + err = mei_cl_read_start(cl, length); if (err < 0) { mutex_unlock(&dev->device_lock); return err; @@ -378,7 +378,7 @@ static void mei_bus_event_work(struct work_struct *work) device->events = 0; /* Prepare for the next read */ - mei_cl_read_start(device->cl); + mei_cl_read_start(device->cl, 0); } int mei_cl_register_event_cb(struct mei_cl_device *device, @@ -392,7 +392,7 @@ int mei_cl_register_event_cb(struct mei_cl_device *device, device->event_context = context; INIT_WORK(&device->event_work, mei_bus_event_work); - mei_cl_read_start(device->cl); + mei_cl_read_start(device->cl, 0); return 0; } @@ -436,7 +436,7 @@ int mei_cl_enable_device(struct mei_cl_device *device) mutex_unlock(&dev->device_lock); if (device->event_cb && !cl->read_cb) - mei_cl_read_start(device->cl); + mei_cl_read_start(device->cl, 0); if (!device->ops || !device->ops->enable) return 0; diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index 9541aa90d8f7..71892745e2e8 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -624,7 +624,7 @@ int mei_cl_flow_ctrl_reduce(struct mei_cl *cl) * * returns 0 on success, <0 on failure. */ -int mei_cl_read_start(struct mei_cl *cl) +int mei_cl_read_start(struct mei_cl *cl, size_t length) { struct mei_device *dev; struct mei_cl_cb *cb; @@ -657,8 +657,9 @@ int mei_cl_read_start(struct mei_cl *cl) if (!cb) return -ENOMEM; - rets = mei_io_cb_alloc_resp_buf(cb, - dev->me_clients[i].props.max_msg_length); + /* always allocate at least client max message */ + length = max_t(size_t, length, dev->me_clients[i].props.max_msg_length); + rets = mei_io_cb_alloc_resp_buf(cb, length); if (rets) goto err; diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h index e890c8bf89d0..cfdb144526aa 100644 --- a/drivers/misc/mei/client.h +++ b/drivers/misc/mei/client.h @@ -87,7 +87,7 @@ int mei_cl_flow_ctrl_reduce(struct mei_cl *cl); bool mei_cl_is_other_connecting(struct mei_cl *cl); int mei_cl_disconnect(struct mei_cl *cl); int mei_cl_connect(struct mei_cl *cl, struct file *file); -int mei_cl_read_start(struct mei_cl *cl); +int mei_cl_read_start(struct mei_cl *cl, size_t length); int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking); void mei_host_client_init(struct work_struct *work); diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c index 9bf64c06fa39..74730713a8d3 100644 --- a/drivers/misc/mei/interrupt.c +++ b/drivers/misc/mei/interrupt.c @@ -145,9 +145,21 @@ static int mei_cl_irq_read_msg(struct mei_device *dev, } if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) { - dev_warn(&dev->pdev->dev, "message overflow.\n"); - list_del(&cb->list); - return -ENOMEM; + dev_dbg(&dev->pdev->dev, "message overflow. size %d len %d idx %ld\n", + cb->response_buffer.size, + mei_hdr->length, cb->buf_idx); + cb->response_buffer.data = + krealloc(cb->response_buffer.data, + mei_hdr->length + cb->buf_idx, + GFP_KERNEL); + + if (!cb->response_buffer.data) { + dev_err(&dev->pdev->dev, "allocation failed.\n"); + list_del(&cb->list); + return -ENOMEM; + } + cb->response_buffer.size = + mei_hdr->length + cb->buf_idx; } buffer = cb->response_buffer.data + cb->buf_idx; diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index 78b4da5ed96c..7c44c8dbae42 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -244,7 +244,7 @@ static ssize_t mei_read(struct file *file, char __user *ubuf, goto out; } - err = mei_cl_read_start(cl); + err = mei_cl_read_start(cl, length); if (err && err != -EBUSY) { dev_dbg(&dev->pdev->dev, "mei start read failure with status = %d\n", err); @@ -292,9 +292,8 @@ static ssize_t mei_read(struct file *file, char __user *ubuf, } /* now copy the data to user space */ copy_buffer: - dev_dbg(&dev->pdev->dev, "cb->response_buffer size - %d\n", - cb->response_buffer.size); - dev_dbg(&dev->pdev->dev, "cb->buf_idx - %lu\n", cb->buf_idx); + dev_dbg(&dev->pdev->dev, "buf.size = %d buf.idx= %ld\n", + cb->response_buffer.size, cb->buf_idx); if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) { rets = -EMSGSIZE; goto free; -- cgit v1.2.3