This is a note to let you know that I've just added the patch titled
staging: speakup_soft: Fix reading of init string
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
>From 40fe4f89671fb3c7ded94190fb267402a38b0261 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <[email protected]>
Date: Sun, 16 Sep 2012 04:18:50 +0100
Subject: staging: speakup_soft: Fix reading of init string
softsynth_read() reads a character at a time from the init string;
when it finds the null terminator it sets the initialized flag but
then repeats the last character.
Additionally, if the read() buffer is not big enough for the init
string, the next read() will start reading from the beginning again.
So the caller may never progress to reading anything else.
Replace the simple initialized flag with the current position in
the init string, carried over between calls. Switch to reading
real data once this reaches the null terminator.
(This assumes that the length of the init string can't change, which
seems to be the case. Really, the string and position belong together
in a per-file private struct.)
Tested-by: Samuel Thibault <[email protected]>
Signed-off-by: Ben Hutchings <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/staging/speakup/speakup_soft.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/drivers/staging/speakup/speakup_soft.c
b/drivers/staging/speakup/speakup_soft.c
index 2a67610..e2f5c81 100644
--- a/drivers/staging/speakup/speakup_soft.c
+++ b/drivers/staging/speakup/speakup_soft.c
@@ -40,7 +40,7 @@ static int softsynth_is_alive(struct spk_synth *synth);
static unsigned char get_index(void);
static struct miscdevice synth_device;
-static int initialized;
+static int init_pos;
static int misc_registered;
static struct var_t vars[] = {
@@ -194,7 +194,7 @@ static int softsynth_close(struct inode *inode, struct file
*fp)
unsigned long flags;
spk_lock(flags);
synth_soft.alive = 0;
- initialized = 0;
+ init_pos = 0;
spk_unlock(flags);
/* Make sure we let applications go before leaving */
speakup_start_ttys();
@@ -239,13 +239,8 @@ static ssize_t softsynth_read(struct file *fp, char *buf,
size_t count,
ch = '\x18';
} else if (synth_buffer_empty()) {
break;
- } else if (!initialized) {
- if (*init) {
- ch = *init;
- init++;
- } else {
- initialized = 1;
- }
+ } else if (init[init_pos]) {
+ ch = init[init_pos++];
} else {
ch = synth_buffer_getc();
}
--
1.7.12.464.g83379df
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