From 7aa4d5c8ffed00ff751f1d8d492ae89d7f3f9736 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Mon, 15 Dec 2014 11:33:08 +0000
Subject: [PATCH] doubletalk: probe failure causes OOPS
The code bothers to probe for the device, but on failing to find it proceeds
to try and release a NULL resource, thereby ruining it's prior good
behaviour
Resolves-Bug: https://bugzilla.kernel.org/show_bug.cgi?id=88581
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/staging/speakup/speakup_dtlk.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/speakup/speakup_dtlk.c b/drivers/staging/speakup/speakup_dtlk.c
index d7d51527389676..ffd85e1a885b38 100644
--- a/drivers/staging/speakup/speakup_dtlk.c
+++ b/drivers/staging/speakup/speakup_dtlk.c
@@ -325,7 +325,7 @@ static struct synth_settings *synth_interrogate(struct spk_synth *synth)
static int synth_probe(struct spk_synth *synth)
{
- unsigned int port_val = 0;
+ unsigned int port_val = 0;
int i = 0;
struct synth_settings *sp;
@@ -361,7 +361,8 @@ static int synth_probe(struct spk_synth *synth)
port_val &= 0xfbff;
if (port_val != 0x107f) {
pr_info("DoubleTalk PC: not found\n");
- synth_release_region(synth_lpc, SYNTH_IO_EXTENT);
+ if (synth_lpc)
+ synth_release_region(synth_lpc, SYNTH_IO_EXTENT);
return -ENODEV;
}
while (inw_p(synth_lpc) != 0x147f)
@@ -369,7 +370,7 @@ static int synth_probe(struct spk_synth *synth)
sp = synth_interrogate(synth);
pr_info("%s: %03x-%03x, ROM ver %s, s/n %u, driver: %s\n",
synth->long_name, synth_lpc, synth_lpc+SYNTH_IO_EXTENT - 1,
- sp->rom_version, sp->serial_number, synth->version);
+ sp->rom_version, sp->serial_number, synth->version);
synth->alive = 1;
return 0;
}
--
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