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android_kernel_sony_sdm845/net/dcb
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Filename Latest commit message Latest commit date
Vladimir Oltean 19f132730d net: dcb: disable softirqs in dcbnl_flush_dev() 
commit 10b6bb62ae1a49ee818fc479cf57b8900176773e upstream.

Ido Schimmel points out that since commit 52cff74eef ("dcbnl : Disable
software interrupts before taking dcb_lock"), the DCB API can be called
by drivers from softirq context.

One such in-tree example is the chelsio cxgb4 driver:
dcb_rpl
-> cxgb4_dcb_handle_fw_update
   -> dcb_ieee_setapp

If the firmware for this driver happened to send an event which resulted
in a call to dcb_ieee_setapp() at the exact same time as another
DCB-enabled interface was unregistering on the same CPU, the softirq
would deadlock, because the interrupted process was already holding the
dcb_lock in dcbnl_flush_dev().

Fix this unlikely event by using spin_lock_bh() in dcbnl_flush_dev() as
in the rest of the dcbnl code.

Fixes: 91b0383fef06 ("net: dcb: flush lingering app table entries for unregistered devices")
Reported-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20220302193939.1368823-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-08 19:00:59 +01:00
..
dcbevent.c net/*: Fix FSF address in file headers 2013-12-06 12:37:57 -05:00
dcbnl.c net: dcb: disable softirqs in dcbnl_flush_dev() 2022-03-08 19:00:59 +01:00
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