[src/trunk]: src/sys/dev/pci gem_pci_attach(): avoid allocating a 2K buffer o...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/db1f6794bc90
branches:  trunk
changeset: 972573:db1f6794bc90
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sat May 30 16:35:02 2020 +0000

description:
gem_pci_attach(): avoid allocating a 2K buffer on the stack.

diffstat:

 sys/dev/pci/if_gem_pci.c |  18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diffs (75 lines):

diff -r 90ccf01fd4f3 -r db1f6794bc90 sys/dev/pci/if_gem_pci.c
--- a/sys/dev/pci/if_gem_pci.c  Sat May 30 16:12:56 2020 +0000
+++ b/sys/dev/pci/if_gem_pci.c  Sat May 30 16:35:02 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_gem_pci.c,v 1.50 2020/03/02 06:38:06 msaitoh Exp $ */
+/*     $NetBSD: if_gem_pci.c,v 1.51 2020/05/30 16:35:02 thorpej Exp $ */
 
 /*
  *
@@ -34,15 +34,15 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_gem_pci.c,v 1.50 2020/03/02 06:38:06 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_gem_pci.c,v 1.51 2020/05/30 16:35:02 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
-#include <sys/malloc.h>
 #include <sys/kernel.h>
 #include <sys/socket.h>
 #include <sys/errno.h>
 #include <sys/device.h>
+#include <sys/kmem.h>
 
 #include <machine/endian.h>
 
@@ -142,6 +142,8 @@
            buf[3] == 'd' && buf[4] == 'e' && buf[5] == 's';
 }
 
+#define        GEM_TMP_BUFSIZE         0x0800
+
 void
 gem_pci_attach(device_t parent, device_t self, void *aux)
 {
@@ -150,9 +152,8 @@
        struct gem_softc *sc = &gsc->gsc_gem;
        prop_data_t data;
        uint8_t enaddr[ETHER_ADDR_LEN];
-       u_int8_t                *enp;
        bus_space_handle_t      romh;
-       u_int8_t                buf[0x0800];
+       uint8_t                 *buf;
        int                     dataoff, vpdoff, serdes;
        int i, got_addr = 0;
 #ifdef GEM_DEBUG
@@ -230,6 +231,8 @@
                return;
        }
 
+       buf = kmem_alloc(GEM_TMP_BUFSIZE, KM_SLEEP);
+
        if ((data = prop_dictionary_get(device_properties(sc->sc_dev),
            "mac-address")) != NULL) {
                memcpy(enaddr, prop_data_data_nocopy(data), ETHER_ADDR_LEN);
@@ -252,7 +255,7 @@
                 * later) chapter 2 describes the data structure.
                 */
 
-               enp = NULL;
+               uint8_t *enp = NULL;
 
                if (sc->sc_variant == GEM_SUN_GEM &&
                    (bus_space_subregion(sc->sc_bustag, sc->sc_h1,
@@ -351,6 +354,9 @@
                        got_addr = 1;
                }
        }
+
+       kmem_free(buf, GEM_TMP_BUFSIZE);
+
        if (!got_addr) {
                printf("%s: no Ethernet address found\n",
                    device_xname(sc->sc_dev));