staging: media: atomisp: reduce load_primary_binaries() stack usage

commit f4d51e5 upstream.

The load_primary_binaries() function is overly complex and has som large
variables on the stack, which can cause warnings depending on CONFIG_FRAME_WARN
setting:

drivers/staging/media/atomisp/pci/sh_css.c: In function 'load_primary_binaries':
drivers/staging/media/atomisp/pci/sh_css.c:5260:1: error: the frame size of 1560 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]

Half of the stack usage is for the prim_descr[] array, but only one
member of the array is used at any given time.

Reduce the stack usage by turning the array into a single structure.

Fixes: a49d253 ("staging/atomisp: Add support for the Intel IPU v2")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: arndb

drivers/staging/media/atomisp/pci/sh_css.c

@@ -5224,7 +5224,6 @@ static int load_primary_binaries(
 	struct ia_css_capture_settings *mycs;
 	unsigned int i;
 	bool need_extra_yuv_scaler = false;
-	struct ia_css_binary_descr prim_descr[MAX_NUM_PRIMARY_STAGES];
 
 	IA_CSS_ENTER_PRIVATE("");
 	assert(pipe);
@@ -5394,15 +5393,16 @@ static int load_primary_binaries(
 
 	/* Primary */
 	for (i = 0; i < mycs->num_primary_stage; i++) {
+		struct ia_css_binary_descr prim_descr;
 		struct ia_css_frame_info *local_vf_info = NULL;
 
 		if (pipe->enable_viewfinder[IA_CSS_PIPE_OUTPUT_STAGE_0] &&
 		    (i == mycs->num_primary_stage - 1))
 			local_vf_info = &vf_info;
-		ia_css_pipe_get_primary_binarydesc(pipe, &prim_descr[i],
+		ia_css_pipe_get_primary_binarydesc(pipe, &prim_descr,
 						   &prim_in_info, &prim_out_info,
 						   local_vf_info, i);
-		err = ia_css_binary_find(&prim_descr[i], &mycs->primary_binary[i]);
+		err = ia_css_binary_find(&prim_descr, &mycs->primary_binary[i]);
 		if (err) {
 			IA_CSS_LEAVE_ERR_PRIVATE(err);
 			return err;