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Warn about untested network drivers #14

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Warn about untested network drivers #14

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28 changes: 28 additions & 0 deletions kgdboe_io.c
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
#include <linux/kgdb.h>
#include <linux/namei.h>
#include <linux/dcache.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/cpu.h>
Expand Down Expand Up @@ -161,13 +163,39 @@ int force_single_cpu_mode(void)
return 0;
}


void check_device_driver_and_warn_if_untested(const char* device_name)
{
char driver_symlink[256] = {0};
snprintf(driver_symlink, sizeof(driver_symlink), "/sys/class/net/%s/device/driver", device_name);

struct path path;

int err = kern_path(driver_symlink, LOOKUP_FOLLOW, &path);

if (err == 0) {
char symlink_target[256] = {0};
char* ptr = d_path(&path, symlink_target, sizeof(symlink_target));
if (!IS_ERR(ptr)) {
if (strstr(ptr, "pcnet32") || strstr(ptr, "e1000") || strstr(ptr, "r8169"))
return;

printk(KERN_WARNING "kgdboe: WARNING: kgdboe was only tested on pcnet32, e1000 and r8169 (Detected driver: %s). Other drivers may hang.\n", ptr);
return;
}
}
printk(KERN_WARNING "kgdboe: WARNING: could not detect the driver for %s device (via readlink %s). Note that kgdboe was only tested on pcnet32, e1000 and r8169. Other drivers may hang.\n", device_name, driver_symlink);
}

int kgdboe_io_init(const char *device_name, int port, const char *local_ip, bool force_single_core)
{
int err;
u8 ipaddr[4];

spin_lock_init(&exception_lock);

check_device_driver_and_warn_if_untested(device_name);

s_pKgdboeNetpoll = netpoll_wrapper_create(device_name, port, local_ip);
if (!s_pKgdboeNetpoll)
return -EINVAL;
Expand Down