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intel_th: Fix device removal logic

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commit 8801922cd94c918e4dc3a108ecaa500c4d40583f upstream.

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>
This commit is contained in:
Alexander Shishkin 2018-09-18 16:10:47 +03:00 committed by Greg Kroah-Hartman
parent 247cc73cd8
commit dc89d37f90
1 changed files with 2 additions and 1 deletions
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3
drivers/hwtracing/intel_th/core.c
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@ -147,7 +147,8 @@ 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)