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- Small fix to virtio_console poll fix from upstream review

This commit is contained in:
Hans de Goede 2010-09-16 10:53:13 +02:00
parent e34bb01b5f
commit 606af2d7c2
2 changed files with 8 additions and 5 deletions
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3
kernel.spec
View File

@ -1906,6 +1906,9 @@ fi
# || ||
%changelog
* Thu Sep 16 2010 Hans de Goede <hdegoede@redhat.com>
- Small fix to virtio_console poll fix from upstream review
* Wed Sep 15 2010 Hans de Goede <hdegoede@redhat.com>
- virtio_console: Fix poll/select blocking even though there is data to read

10
linux-2.6.35.4-virtio_console-fix-poll.patch
View File

@ -1,4 +1,4 @@
Subject: virtio_console: Fix poll blocking even though there is data to read (version 2)
Subject: virtio_console: Fix poll blocking even though there is data to read
From: Hans de Goede <hdegoede@redhat.com>
I found this while working on a Linux agent for spice, the symptom I was
@ -10,9 +10,9 @@ read won't block. However if an application reads enough bytes from inbuf
through port_fops_read, to empty the current port->inbuf, port->inbuf
will be NULL even though there may be buffers left in the virtqueue.
This causes poll() to block even though there is data ready to be read, this
patch fixes this by using port_has_data(port) instead of the
port->inbuf != NULL check.
This causes poll() to block even though there is data to be read, this patch
fixes this by using the alredy defined will_read_block utility function
instead of the port->inbuf != NULL check.
Signed-off-By: Hans de Goede <hdegoede@redhat.com>
diff -up linux-2.6.35.x86_64/drivers/char/virtio_console.c~ linux-2.6.35.x86_64/drivers/char/virtio_console.c
@ -23,7 +23,7 @@ diff -up linux-2.6.35.x86_64/drivers/char/virtio_console.c~ linux-2.6.35.x86_64/
ret = 0;
- if (port->inbuf)
+ if (port_has_data(port))
+ if (!will_read_block(port))
ret |= POLLIN | POLLRDNORM;
if (!will_write_block(port))
ret |= POLLOUT;