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| author | Jensen Huang <jensenhuang@friendlyarm.com> | 2023-12-07 16:21:59 +0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2023-12-19 18:23:01 +0100 |
| commit | 19cde9c92b8d3b7ee555d0da3bcb0232d3a784f4 (patch) | |
| tree | f96a1a9e1427b5d1cb35d1f4a6ef09a63216a9fa /lib/fdt_wip.c | |
| parent | 043465b66506e8c647cdd38a2db1f2ee0f369a1b (diff) | |
i2c: rk3x: fix potential spinlock recursion on poll
Possible deadlock scenario (on reboot):
rk3x_i2c_xfer_common(polling)
-> rk3x_i2c_wait_xfer_poll()
-> rk3x_i2c_irq(0, i2c);
--> spin_lock(&i2c->lock);
...
<rk3x i2c interrupt>
-> rk3x_i2c_irq(0, i2c);
--> spin_lock(&i2c->lock); (deadlock here)
Store the IRQ number and disable/enable it around the polling transfer.
This patch has been tested on NanoPC-T4.
Signed-off-by: Jensen Huang <jensenhuang@friendlyarm.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'lib/fdt_wip.c')
0 files changed, 0 insertions, 0 deletions