[PATCH] pcmcia: reduce ds.c stack footprint

This patch reduces the stack footprint of pcmcia_device_query() from 416 bytes
to 36 bytes.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 43da2e9..398146e 100644 (file)
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -424,9 +424,13 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
 {
        cistpl_manfid_t manf_id;
        cistpl_funcid_t func_id;
-       cistpl_vers_1_t vers1;
+       cistpl_vers_1_t *vers1;
        unsigned int i;
 
+       vers1 = kmalloc(sizeof(*vers1), GFP_KERNEL);
+       if (!vers1)
+               return -ENOMEM;
+
        if (!pccard_read_tuple(p_dev->socket, p_dev->func,
                               CISTPL_MANFID, &manf_id)) {
                p_dev->manf_id = manf_id.manf;
@@ -443,23 +447,30 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
                /* rule of thumb: cards with no FUNCID, but with
                 * common memory device geometry information, are
                 * probably memory cards (from pcmcia-cs) */
-               cistpl_device_geo_t devgeo;
+               cistpl_device_geo_t *devgeo;
+
+               devgeo = kmalloc(sizeof(*devgeo), GFP_KERNEL);
+               if (!devgeo) {
+                       kfree(vers1);
+                       return -ENOMEM;
+               }
                if (!pccard_read_tuple(p_dev->socket, p_dev->func,
-                                     CISTPL_DEVICE_GEO, &devgeo)) {
+                                     CISTPL_DEVICE_GEO, devgeo)) {
                        ds_dbg(0, "mem device geometry probably means "
                               "FUNCID_MEMORY\n");
                        p_dev->func_id = CISTPL_FUNCID_MEMORY;
                        p_dev->has_func_id = 1;
                }
+               kfree(devgeo);
        }
 
        if (!pccard_read_tuple(p_dev->socket, p_dev->func, CISTPL_VERS_1,
-                              &vers1)) {
-               for (i=0; i < vers1.ns; i++) {
+                              vers1)) {
+               for (i=0; i < vers1->ns; i++) {
                        char *tmp;
                        unsigned int length;
 
-                       tmp = vers1.str + vers1.ofs[i];
+                       tmp = vers1->str + vers1->ofs[i];
 
                        length = strlen(tmp) + 1;
                        if ((length < 3) || (length > 255))
@@ -475,6 +486,7 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
                }
        }
 
+       kfree(vers1);
        return 0;
 }