From 2f8e0b31ad257bca9ff5dda9fdfdcc98d38d97f8 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Wed, 30 Nov 2011 13:34:14 -0500 Subject: [PATCH] lttng lib: ring buffer: remove stale null-pointer * Dan Carpenter wrote: [...] > The patch c844b2f5cfea: "lttng lib: ring buffer" from Nov 28, 2011, > leads to the following Smatch complaint: > > drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c +1150 > +lib_ring_buffer_print_buffer_errors() > warn: variable dereferenced before check 'chan' (see line 1143) > > drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c > 1142 { > 1143 const struct lib_ring_buffer_config *config = > +chan->backend.config; > > +^^^^^^^^^^^^^^^^^^^^ > Dereference. > > 1144 unsigned long write_offset, cons_offset; > 1145 > 1146 /* > 1147 * Can be called in the error path of allocation when > 1148 * trans_channel_data is not yet set. > 1149 */ > 1150 if (!chan) > ^^^^^^^^^ > Check. At first glance the comment seems out of date, I think check can > be removed safely. > > 1151 return; > 1152 /* Reported-by: Dan Carpenter Signed-off-by: Mathieu Desnoyers Signed-off-by: Greg Kroah-Hartman --- drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c index 802f5cd4cd16..957d7f3d7ac6 100644 --- a/drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c +++ b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c @@ -1143,12 +1143,6 @@ void lib_ring_buffer_print_buffer_errors(struct lib_ring_buffer *buf, const struct lib_ring_buffer_config *config = chan->backend.config; unsigned long write_offset, cons_offset; - /* - * Can be called in the error path of allocation when - * trans_channel_data is not yet set. - */ - if (!chan) - return; /* * No need to order commit_count, write_offset and cons_offset reads * because we execute at teardown when no more writer nor reader -- 2.20.1