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authorAdrian Hunter2017-11-21 15:42:30 +0200
committerUlf Hansson2017-11-23 14:39:13 +0100
commitf9f0da98819503b06b35e61869d18cf3a8cd3323 (patch)
tree3958ac5701d4c83a9b79f27bbdb40df395aaa7db /tools/firewire
parentebe7dd45cf49e3b49cacbaace17f9f878f21fbea (diff)
mmc: block: Ensure that debugfs files are removed
The card is not necessarily being removed, but the debugfs files must be removed when the driver is removed, otherwise they will continue to exist after unbinding the card from the driver. e.g. # echo "mmc1:0001" > /sys/bus/mmc/drivers/mmcblk/unbind # cat /sys/kernel/debug/mmc1/mmc1\:0001/ext_csd [ 173.634584] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 [ 173.643356] IP: mmc_ext_csd_open+0x5e/0x170 A complication is that the debugfs_root may have already been removed, so check for that too. Fixes: 627c3ccfb46a ("mmc: debugfs: Move block debugfs into block module") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Cc: stable@vger.kernel.org # 4.14+ Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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