staging: pi433: reduce stack size in tx thread

Putting a 900 byte array on the stack is a clearly too much in the
kernel, and sometimes results in warnings like:

drivers/staging/pi433/pi433_if.c: In function 'pi433_tx_thread':
drivers/staging/pi433/pi433_if.c:645:1: error: the frame size of 1028 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

This moves the buffer into the dynamically allocated per-device
structure.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Marcus Wolf <linux@wolf-entwicklungen.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
index 6588a507dfec563820f96b47e0be1e17c5300cab..6b9b7df70f8e0b899583c2d63b61ba6089cbee2b 100644 (file)
--- a/drivers/staging/pi433/pi433_if.c
+++ b/drivers/staging/pi433/pi433_if.c
@@ -92,6 +92,7 @@ struct pi433_device {
        struct task_struct      *tx_task_struct;
        wait_queue_head_t       tx_wait_queue;
        u8                      free_in_fifo;
+       char                    buffer[MAX_MSG_SIZE];
 
        /* rx related values */
        struct pi433_rx_cfg     rx_cfg;
@@ -490,7 +491,7 @@ pi433_tx_thread(void *data)
        struct pi433_device *device = data;
        struct spi_device *spi = device->spi; /* needed for SET_CHECKED */
        struct pi433_tx_cfg tx_cfg;
-       u8     buffer[MAX_MSG_SIZE];
+       u8     *buffer = device->buffer;
        size_t size;
        bool   rx_interrupted = false;
        int    position, repetitions;