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When trying to match the nomatch event passed to us, attempt to look

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up the device described by the nomatch event in the device tree. If we
find it, then if the device is marked as have already attached to a
device once, then ignore the device.

This keeps us from reloading the device driver when it has just been
manually unloaded. All devies that have had a driver attach to them at
least once no longer participate in pnp-based autoloading.

Differential Revision: https://reviews.freebsd.org/D16735
This commit is contained in:
Warner Losh 2018-08-23 05:06:22 +00:00
parent d36967bd2b
commit ce1ba01c8a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=338237
1 changed files with 60 additions and 5 deletions
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65
sbin/devmatch/devmatch.c
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@ -65,6 +65,7 @@ static int verbose_flag;
static void *hints;
static void *hints_end;
static struct devinfo_dev *root;
static void *
read_hints(const char *fn, size_t *len)
@ -440,10 +441,50 @@ find_unmatched(struct devinfo_dev *dev, void *arg)
return (devinfo_foreach_device_child(dev, find_unmatched, arg));
}
struct exact_info
{
const char *bus;
const char *loc;
struct devinfo_dev *dev;
};
/*
* Look for the exact location specified by the nomatch event. The
* loc and pnpinfo run together to get the string we're looking for,
* so we have to synthesize the same thing that subr_bus.c is
* generating in devnomatch/devaddq to do the string comparison.
*/
static int
find_exact_dev(struct devinfo_dev *dev, void *arg)
{
struct devinfo_dev *parent;
char *loc;
struct exact_info *info;
info = arg;
do {
if (info->dev != NULL)
break;
if (!(dev->dd_flags & DF_ENABLED))
break;
parent = devinfo_handle_to_device(dev->dd_parent);
if (strcmp(info->bus, parent->dd_name) != 0)
break;
asprintf(&loc, "%s %s", parent->dd_pnpinfo,
parent->dd_location);
if (strcmp(loc, info->loc) == 0)
info->dev = dev;
free(loc);
} while (0);
return (devinfo_foreach_device_child(dev, find_exact_dev, arg));
}
static void
find_nomatch(char *nomatch)
{
char *bus, *pnpinfo, *tmp;
char *bus, *pnpinfo, *tmp, *busnameunit;
struct exact_info info;
/*
* Find our bus name. It will include the unit number. We have to search
@ -459,6 +500,9 @@ find_nomatch(char *nomatch)
errx(1, "No bus found in nomatch string: '%s'", nomatch);
bus = tmp + 4;
*tmp = '\0';
busnameunit = strdup(bus);
if (busnameunit == NULL)
errx(1, "Can't allocate memory for strings");
tmp = bus + strlen(bus) - 1;
while (tmp > bus && isdigit(*tmp))
tmp--;
@ -475,6 +519,17 @@ find_nomatch(char *nomatch)
errx(1, "Malformed NOMATCH string: '%s'", nomatch);
pnpinfo = nomatch + 4;
/*
* See if we can find the devinfo_dev for this device. If we
* can, and it's been attached before, we should filter it out
* so that a kldunload foo doesn't cause an immediate reload.
*/
info.loc = pnpinfo;
info.bus = busnameunit;
info.dev = NULL;
devinfo_foreach_device_child(root, find_exact_dev, (void *)&info);
if (info.dev != NULL && info.dev->dd_flags & DF_ATTACHED_ONCE)
exit(0);
search_hints(bus, "", pnpinfo);
exit(0);
@ -490,7 +545,6 @@ usage(void)
int
main(int argc, char **argv)
{
struct devinfo_dev *root;
int ch;
while ((ch = getopt_long(argc, argv, "adh:p:uv",
@ -530,12 +584,13 @@ main(int argc, char **argv)
exit(0);
}
if (nomatch_str != NULL)
find_nomatch(nomatch_str);
if (devinfo_init())
err(1, "devinfo_init");
if ((root = devinfo_handle_to_device(DEVINFO_ROOT_DEVICE)) == NULL)
errx(1, "can't find root device");
devinfo_foreach_device_child(root, find_unmatched, (void *)0);
if (nomatch_str != NULL)
find_nomatch(nomatch_str);
else
devinfo_foreach_device_child(root, find_unmatched, (void *)0);
devinfo_free();
}