diff options
| -rw-r--r-- | drivers/misc/mei/main.c | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index 677d0362f334..36ca15234344 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -159,27 +159,22 @@ static ssize_t mei_read(struct file *file, char __user *ubuf, goto out; } + if (ubuf == NULL) { + rets = -EMSGSIZE; + goto out; + } + if (cl == &dev->iamthif_cl) { rets = mei_amthif_read(dev, file, ubuf, length, offset); goto out; } cb = mei_cl_read_cb(cl, file); - if (cb) { - /* read what left */ - if (cb->buf_idx > *offset) - goto copy_buffer; - /* offset is beyond buf_idx we have no more data return 0 */ - if (cb->buf_idx > 0 && cb->buf_idx <= *offset) { - rets = 0; - goto free; - } - /* Offset needs to be cleaned for contiguous reads*/ - if (cb->buf_idx == 0 && *offset > 0) - *offset = 0; - } else if (*offset > 0) { + if (cb) + goto copy_buffer; + + if (*offset > 0) *offset = 0; - } err = mei_cl_read_start(cl, length, file); if (err && err != -EBUSY) { @@ -231,10 +226,10 @@ copy_buffer: goto free; } - cl_dbg(dev, cl, "buf.size = %d buf.idx = %ld\n", - cb->buf.size, cb->buf_idx); - if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) { - rets = -EMSGSIZE; + cl_dbg(dev, cl, "buf.size = %d buf.idx = %ld offset = %lld\n", + cb->buf.size, cb->buf_idx, *offset); + if (*offset >= cb->buf_idx) { + rets = 0; goto free; } @@ -255,6 +250,7 @@ copy_buffer: free: mei_io_cb_free(cb); + *offset = 0; out: cl_dbg(dev, cl, "end mei read rets = %d\n", rets); |