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staging: speakup: fix synth caching when synth init fails 

synths[] array caches currently loaded synths. synth_add checks
synths[] before adding a new one. It however ignores the result of
do_synth_init. So when do_synth_init fails, the failed synth is still
cached. Since, as a result module loading fails too, synth_remove -
which is responsible for removing the cached synth - is never called.
Next time the failing synth is added again it succeeds because
synth_add finds it cached inside synths[].

This patch fixes this by caching a synth only after do_synth_init
succeeds.

Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Okash Khawaja 2017-06-20 11:07:32 +01:00 committed by Greg Kroah-Hartman
parent eebdd3f61b
commit e4dd8bca3d
1 changed files with 7 additions and 2 deletions
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9
drivers/staging/speakup/synth.c
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@ -445,10 +445,15 @@ int synth_add(struct spk_synth *in_synth)
mutex_unlock(&spk_mutex);
return -1;
}
synths[i++] = in_synth;
synths[i] = NULL;
if (in_synth->startup)
status = do_synth_init(in_synth);
if (!status) {
synths[i++] = in_synth;
synths[i] = NULL;
}
mutex_unlock(&spk_mutex);
return status;
}