From: Ian Abbott Date: Wed, 18 Nov 2015 17:55:11 +0000 (+0000) Subject: staging: comedi: check for more errors for zero-length write X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=28a60c456bc52bbe949ad54c6b23917a651fc342;p=openwrt%2Fstaging%2Fblogic.git staging: comedi: check for more errors for zero-length write If the "write" file operation handler, `comedi_write()` is passed 0 for the amount to write, some error conditions are currently skipped and the function just returns 0. Change it to check those error conditions and return an error value if appropriate. The trickiest case is the check for when the previously set up asynchronous command has terminated with an error. In that case, `-EPIPE` is returned (as it is for a write of non-zero length) and the subdevice gets marked as non-busy. A zero-length write that returns 0 has no other effects, in particular, it does not cause the subdevice to be marked as non-busy. Signed-off-by: Ian Abbott Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 5a9c9d9782f3..d57fadef47fc 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2331,8 +2331,6 @@ static ssize_t comedi_write(struct file *file, const char __user *buf, } async = s->async; - if (!nbytes) - goto out; if (s->busy != file || !(async->cmd.flags & CMDF_WRITE)) { retval = -EINVAL; goto out; @@ -2349,9 +2347,12 @@ static ssize_t comedi_write(struct file *file, const char __user *buf, if (!comedi_is_runflags_running(runflags)) { if (comedi_is_runflags_in_error(runflags)) retval = -EPIPE; - become_nonbusy = true; + if (retval || nbytes) + become_nonbusy = true; break; } + if (nbytes == 0) + break; /* Allocate all free buffer space. */ comedi_buf_write_alloc(s, async->prealloc_bufsz);