kdmx incorrectly detects a 0xff character read from the serial port
as a read error. Fix.
---
kdmx/kdmx.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
Index: b/kdmx/kdmx.c
===================================================================
--- a/kdmx/kdmx.c
+++ b/kdmx/kdmx.c
@@ -113,6 +113,8 @@ char do_read(int fd, int *ret_errno)
unsigned char buf;
int ret;
+ *ret_errno = 0;
+
/* Perform the read */
ret = read(fd, &buf, sizeof(buf));
if (ret == -1) {
@@ -475,7 +477,7 @@ handle_gdb(void)
response_pending = 1;
rcv = do_read(gdb_fd, &ret_errno);
- if (rcv == -1) {
+ if (!ret_errno) {
/*
* <ctrl>C in gdb or the gdb kill command will result in
@@ -599,7 +601,7 @@ handle_serial(void)
memset(buf, 0, sizeof(buf));
rcv = do_read(serial_fd, &ret_errno);
- if (rcv == -1) {
+ if (!ret_errno) {
pr_err("read() of serial port returned unexpected errno %d\n",
ret_errno);
exit(EXIT_FAILURE);
@@ -660,7 +662,7 @@ handle_serial(void)
/* read one char */
rcv = do_read(serial_fd, &ret_errno);
- if (rcv == -1) {
+ if (!ret_errno) {
pr_err("read() of serial port returned
unexpected errno %d\n",
ret_errno);
exit(EXIT_FAILURE);
@@ -710,7 +712,7 @@ handle_term(void)
char rcv;
rcv = do_read(term_fd, &ret_errno);
- if (rcv == -1) {
+ if (!ret_errno) {
reset_term(ret_errno);
return;
}
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