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[media] lirc_zilog: Don't use dynamic static allocation

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Dynamic static allocation is evil, as Kernel stack is too low, and
ompilation complains about it on some archs:
	drivers/staging/media/lirc/lirc_zilog.c:967:1: warning: 'read' uses dynamic stack allocation [enabled by default]
Instead, let's enforce a limit for the buffer to be 64. That should
be more than enough.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-11-02 08:16:47 -03:00
parent c98300a0e8
commit ac5b4b6bf0
1 changed files with 11 additions and 1 deletions
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12
drivers/staging/media/lirc/lirc_zilog.c
View file

@ -61,6 +61,9 @@
#include <media/lirc_dev.h>
#include <media/lirc.h>
/* Max transfer size done by I2C transfer functions */
#define MAX_XFER_SIZE 64
struct IR;
struct IR_rx {
@ -941,7 +944,14 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos)
schedule();
set_current_state(TASK_INTERRUPTIBLE);
} else {
unsigned char buf[rbuf->chunk_size];
unsigned char buf[MAX_XFER_SIZE];
if (rbuf->chunk_size > sizeof(buf)) {
zilog_error("chunk_size is too big (%d)!\n",
rbuf->chunk_size);
ret = -EINVAL;
break;
}
m = lirc_buffer_read(rbuf, buf);
if (m == rbuf->chunk_size) {
ret = copy_to_user((void *)outbuf+written, buf,