Hello Konrad Zapalowicz,
The patch ea6e9dea2e72: "staging: dgnc: Fix frame size is larger than
1024B" from Aug 6, 2014, leads to the following static checker
warning:
drivers/staging/dgnc/dgnc_tty.c:479 dgnc_sniff_nowait_nolock()
error: scheduling with locks held: 'spin_lock:ch_lock'
drivers/staging/dgnc/dgnc_tty.c
467 void dgnc_sniff_nowait_nolock(struct channel_t *ch, uchar *text, uchar *buf, int len)
468 {
469 struct timeval tv;
470 int n;
471 int r;
472 int nbuf;
473 int i;
474 int tmpbuflen;
475 char *tmpbuf;
476 char *p;
477 int too_much_data;
478
479 tmpbuf = kzalloc(TMPBUFLEN, GFP_KERNEL);
^^^^^^^^^^
This is a sleeping under spinlock bug.
480 if (!tmpbuf)
481 return;
482 p = tmpbuf;
Normally the way to fix these is to just do a GFP_ATOMIC allocation but
sometimes you can shuffle the lock and the allocation around to avoid
the problem.
regards,
dan carpenter
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