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https://github.com/joel16/android_kernel_sony_msm8994.git
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ser_gigaset: convert mutex to completion
The ser_gigaset ISDN driver was using a mutex in its close() method for waiting for other running ldisc methods to finish. That's what completions are for. Incidentally, this also avoids a spurious "BUG: lock held at task exit time" message when the driver's userspace daemon daemonizes itself. Signed-off-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -17,6 +17,7 @@
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#include <linux/platform_device.h>
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#include <linux/tty.h>
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#include <linux/poll.h>
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#include <linux/completion.h>
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/* Version Information */
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#define DRIVER_AUTHOR "Tilman Schmidt"
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@ -48,7 +49,7 @@ struct ser_cardstate {
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struct platform_device dev;
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struct tty_struct *tty;
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atomic_t refcnt;
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struct mutex dead_mutex;
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struct completion dead_cmp;
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};
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static struct platform_driver device_driver = {
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@ -498,7 +499,7 @@ static struct cardstate *cs_get(struct tty_struct *tty)
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static void cs_put(struct cardstate *cs)
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{
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if (atomic_dec_and_test(&cs->hw.ser->refcnt))
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mutex_unlock(&cs->hw.ser->dead_mutex);
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complete(&cs->hw.ser->dead_cmp);
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}
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/*
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@ -527,8 +528,8 @@ gigaset_tty_open(struct tty_struct *tty)
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cs->dev = &cs->hw.ser->dev.dev;
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cs->hw.ser->tty = tty;
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mutex_init(&cs->hw.ser->dead_mutex);
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atomic_set(&cs->hw.ser->refcnt, 1);
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init_completion(&cs->hw.ser->dead_cmp);
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tty->disc_data = cs;
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@ -543,7 +544,6 @@ gigaset_tty_open(struct tty_struct *tty)
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}
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gig_dbg(DEBUG_INIT, "Startup of HLL done");
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mutex_lock(&cs->hw.ser->dead_mutex);
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return 0;
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error:
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@ -577,7 +577,7 @@ gigaset_tty_close(struct tty_struct *tty)
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else {
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/* wait for running methods to finish */
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if (!atomic_dec_and_test(&cs->hw.ser->refcnt))
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mutex_lock(&cs->hw.ser->dead_mutex);
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wait_for_completion(&cs->hw.ser->dead_cmp);
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}
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/* stop operations */
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