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authorJiri Slaby <jirislaby@gmail.com>2009-06-29 12:03:34 -0400
committerTakashi Iwai <tiwai@suse.de>2009-06-29 12:05:52 -0400
commit9ea5ca75a2aebb7172094a7d77acf6ff7600cc56 (patch)
tree2fc0f2d554feaac4c23ec7c84334db30d7decbd4
parent580c9d373ce7ccfbc5227e985fca761f8f039af3 (diff)
sound: OSS: mpu401, fix deadlock
mpu401_chk_version is called with a spin lock already held. Don't take it again. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/oss/mpu401.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/sound/oss/mpu401.c b/sound/oss/mpu401.c
index 6c0a770ed054..1b2316f35b1f 100644
--- a/sound/oss/mpu401.c
+++ b/sound/oss/mpu401.c
@@ -926,31 +926,21 @@ static struct midi_operations mpu401_midi_operations[MAX_MIDI_DEV];
926static void mpu401_chk_version(int n, struct mpu_config *devc) 926static void mpu401_chk_version(int n, struct mpu_config *devc)
927{ 927{
928 int tmp; 928 int tmp;
929 unsigned long flags;
930 929
931 devc->version = devc->revision = 0; 930 devc->version = devc->revision = 0;
932 931
933 spin_lock_irqsave(&devc->lock,flags); 932 tmp = mpu_cmd(n, 0xAC, 0);
934 if ((tmp = mpu_cmd(n, 0xAC, 0)) < 0) 933 if (tmp < 0)
935 {
936 spin_unlock_irqrestore(&devc->lock,flags);
937 return; 934 return;
938 }
939 if ((tmp & 0xf0) > 0x20) /* Why it's larger than 2.x ??? */ 935 if ((tmp & 0xf0) > 0x20) /* Why it's larger than 2.x ??? */
940 {
941 spin_unlock_irqrestore(&devc->lock,flags);
942 return; 936 return;
943 }
944 devc->version = tmp; 937 devc->version = tmp;
945 938
946 if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) 939 if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) {
947 {
948 devc->version = 0; 940 devc->version = 0;
949 spin_unlock_irqrestore(&devc->lock,flags);
950 return; 941 return;
951 } 942 }
952 devc->revision = tmp; 943 devc->revision = tmp;
953 spin_unlock_irqrestore(&devc->lock,flags);
954} 944}
955 945
956int attach_mpu401(struct address_info *hw_config, struct module *owner) 946int attach_mpu401(struct address_info *hw_config, struct module *owner)