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authorJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:22 -0500
committerJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:22 -0500
commitf5316b4aea024da9266d740322a5481657f6ce59 (patch)
tree5888fd0afa54fc3bab2711e583147c4b563836bc /kernel/debug/debug_core.c
parentdcc7871128e99458ca86186b7bc8bf27ff0c47b5 (diff)
kgdb,8250,pl011: Return immediately from console poll
The design of the kdb shell requires that every device that can provide input to kdb have a polling routine that exits immediately if there is no character available. This is required in order to get the page scrolling mechanism working. Changing the kernel debugger I/O API to require all polling character routines to exit immediately if there is no data allows the kernel debugger to process multiple input channels. NO_POLL_CHAR will be the return code to the polling routine when ever there is no character available. CC: linux-serial@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel/debug/debug_core.c')
-rw-r--r--kernel/debug/debug_core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 6e1fa829fde..1d71df66f3f 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -882,6 +882,8 @@ EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
int dbg_io_get_char(void)
{
int ret = dbg_io_ops->read_char();
+ if (ret == NO_POLL_CHAR)
+ return -1;
if (!dbg_kdb_mode)
return ret;
if (ret == 127)