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| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2011-07-05 21:50:18 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-04 21:58:41 -0700 |
| commit | 9f78aa15dc4b47ca0bc6269c7c0e4f2345a66580 (patch) | |
| tree | 805b9cde463755fc54ddf4070aa996fd564db7b0 /ipc | |
| parent | dc96c18103480c2aacb6c4c7fbb9400e29c604c9 (diff) | |
hvc_console: Improve tty/console put_chars handling
commit 8c2381af0d3ef62a681dac5a141b6dabb27bf2e1 upstream.
Currently, the hvc_console_print() function drops console output if the
hvc backend's put_chars() returns 0. This patch changes this behavior
to allow a retry through returning -EAGAIN.
This change also affects the hvc_push() function. Both functions are
changed to handle -EAGAIN and to retry the put_chars() operation.
If a hvc backend returns -EAGAIN, the retry handling differs:
- hvc_console_print() spins to write the complete console output.
- hvc_push() behaves the same way as for returning 0.
Now hvc backends can indirectly control the way how console output is
handled through the hvc console layer.
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions