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| author |   Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2018-09-18 16:10:47 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-18 16:08:38 +0200 |
| commit | 8801922cd94c918e4dc3a108ecaa500c4d40583f (patch) | |
| tree | 2ceb2e0a4b511d597110aa1bbbc667564874bb68 /drivers/hwtracing/intel_th | |
| parent | Merge tag 'soundwire-4.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire into char-misc-linus (diff) | |
| download | linux-dev-8801922cd94c918e4dc3a108ecaa500c4d40583f.tar.xz linux-dev-8801922cd94c918e4dc3a108ecaa500c4d40583f.zip | |
intel_th: Fix device removal logic
Commit a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices")
brings in new subdevice addition/removal logic that's broken for "host
mode": the SWITCH device has no children to begin with, which is not
handled in the code. This results in a null dereference bug later down
the path.
This patch fixes the subdevice removal code to handle host mode correctly.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Fixes: a753bfcfdb1f ("intel_th: Make the switch allocate its subdevices")
CC: stable@vger.kernel.org # v4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/intel_th')
| -rw-r--r-- | drivers/hwtracing/intel_th/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index da962aa2cef5..4e70ecee2103 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -139,7 +139,8 @@ static int intel_th_remove(struct device *dev) th->thdev[i] = NULL; } - th->num_thdevs = lowest; + if (lowest >= 0) + th->num_thdevs = lowest; } if (thdrv->attr_group) |