[PATCH] sysrq: allow user trigger sysrq by upper-case character key

["zhangwei(Jovi)" <jovi.zhangwei@huawei.com>]

See the help text output of /proc/sysrq-trigger:

   SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E)
   memory-full-oom-kill(F) kill-all-tasks(I) ...

Most command is referenced by responding upper-case character,
this would hint user can trigger sysrq by upper-case character key,
but that's wrong, sysrq only accept lower-case character currently.

It's reasonable to let user trigger sysrq by upper-case character key.

Signed-off-by: zhnagwei(Jovi) <jovi.zhangwei@huawei.com>
---
 drivers/tty/sysrq.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 3687f0c..a88908e 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -471,6 +471,8 @@ static int sysrq_key_table_key2index(int key)
 		retval = key - '0';
 	else if ((key >= 'a') && (key <= 'z'))
 		retval = key + 10 - 'a';
+	else if ((key >= 'A') && (key <= 'Z'))
+		retval = key + 10 - 'A';
 	else
 		retval = -1;
 	return retval;
-- 
1.7.9.7