diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-20 15:02:40 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-29 14:03:47 +0200 |
commit | 6f1de6b70d857d5e316ae6fd908f52818b827b08 (patch) | |
tree | 1a0c8e85a0d1046373cdad821e9dda0025046be9 | |
parent | b0585e7e07982daa578c3bfef7f6843c89f110a8 (diff) | |
download | qemu-6f1de6b70d857d5e316ae6fd908f52818b827b08.zip qemu-6f1de6b70d857d5e316ae6fd908f52818b827b08.tar.gz qemu-6f1de6b70d857d5e316ae6fd908f52818b827b08.tar.bz2 |
char: change qemu_chr_fe_add_watch to return unsigned
g_source_attach can return any value between 1 and UINT_MAX if you let
QEMU run long enough. However, qemu_chr_fe_add_watch can also return
a negative errno value when the device is disconnected or does not
support chr_add_watch. Change it to return zero to avoid overloading
these values.
Fix the cadence_uart which asserts in this case (easily obtained with
"-serial pty").
Tested-by: Bret Ketchum <bcketchum@gmail.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r-- | hw/char/cadence_uart.c | 9 | ||||
-rw-r--r-- | include/sysemu/char.h | 16 | ||||
-rw-r--r-- | net/vhost-user.c | 2 | ||||
-rw-r--r-- | qemu-char.c | 8 |
4 files changed, 25 insertions, 10 deletions
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c index c856fc3..65179fa 100644 --- a/hw/char/cadence_uart.c +++ b/hw/char/cadence_uart.c @@ -292,9 +292,12 @@ static gboolean cadence_uart_xmit(GIOChannel *chan, GIOCondition cond, memmove(s->tx_fifo, s->tx_fifo + ret, s->tx_count); if (s->tx_count) { - int r = qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP, - cadence_uart_xmit, s); - assert(r); + guint r = qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP, + cadence_uart_xmit, s); + if (!r) { + s->tx_count = 0; + return FALSE; + } } uart_update_status(s); diff --git a/include/sysemu/char.h b/include/sysemu/char.h index 1eb2d0f..57df10a 100644 --- a/include/sysemu/char.h +++ b/include/sysemu/char.h @@ -221,8 +221,20 @@ void qemu_chr_fe_event(CharDriverState *s, int event); void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...) GCC_FMT_ATTR(2, 3); -int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond, - GIOFunc func, void *user_data); +/** + * @qemu_chr_fe_add_watch: + * + * If the backend is connected, create and add a #GSource that fires + * when the given condition (typically G_IO_OUT|G_IO_HUP or G_IO_HUP) + * is active; return the #GSource's tag. If it is disconnected, + * return 0. + * + * @cond the condition to poll for + * @func the function to call when the condition happens + * @user_data the opaque pointer to pass to @func + */ +guint qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond, + GIOFunc func, void *user_data); /** * @qemu_chr_fe_write: diff --git a/net/vhost-user.c b/net/vhost-user.c index d72ce9b..636899a 100644 --- a/net/vhost-user.c +++ b/net/vhost-user.c @@ -22,7 +22,7 @@ typedef struct VhostUserState { NetClientState nc; CharDriverState *chr; VHostNetState *vhost_net; - int watch; + guint watch; uint64_t acked_features; } VhostUserState; diff --git a/qemu-char.c b/qemu-char.c index 84f49ac..8575c54 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -3966,19 +3966,19 @@ void qemu_chr_fe_event(struct CharDriverState *chr, int event) } } -int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond, - GIOFunc func, void *user_data) +guint qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond, + GIOFunc func, void *user_data) { GSource *src; guint tag; if (s->chr_add_watch == NULL) { - return -ENOSYS; + return 0; } src = s->chr_add_watch(s, cond); if (!src) { - return -EINVAL; + return 0; } g_source_set_callback(src, (GSourceFunc)func, user_data, NULL); |